User guide | 3Com 1000 Switch User Manual

®
SuperStack® II Switch 1000
User Guide
Agent Software Version 3.1
http://www.3com.com/
Document No. DUA1690-0AAA05
Published June 1997
3Com Corporation
■
5400 Bayfront Plaza
Copyright © 3Com Ireland, 1997. All rights reserved. No part of this
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95052-8145
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CONTENTS
Switch 1000 on Your Network 1-6
Server Connections 1-6
Network Configuration Examples 1-6
Network Segmentation I 1-7
Network Segmentation II 1-8
Desktop Switching 1-9
Unit Overview — Front 1-10
10BASE-T Ports 1-11
100BASE-TX Port 1-11
LEDs 1-11
Unit Overview — Rear 1-12
Power Socket 1-13
Unit Serial Number 1-13
Redundant Power System Socket 1-13
Reset Button 1-13
Console Port 1-13
Plug-in Module Slot 1-13
Transceiver Module Slot 1-13
Ethernet Address 1-13
Unit Defaults 1-14
Managing the Switch 1000 1-14
Quick Start For SNMP Users 1-15
Entering an IP Address for the Switch 1-15
ABOUT THIS GUIDE
Introduction 1
How to Use This Guide 1
Conventions 2
Related Documentation 2
1
GETTING STARTED
About the Switch 1000 1-1
Summary of Features 1-1
Port Connections 1-2
10BASE-T Ports 1-2
100BASE-TX Port 1-2
Plug-in Module 1-2
Transceiver Module 1-2
Backbone Port 1-2
Switch Operation and Features 1-3
How Does the Switch Compare to a Bridge? 1-3
Forwarding of Packets 1-3
Intelligent Flow Management 1-4
Full Duplex 1-4
Security 1-5
Resilient Links 1-5
Virtual LANs 1-5
Spanning Tree Protocol 1-5
PACE 1-6
2
INSTALLATION AND SETUP
Following Safety Information 2-1
Positioning the Switch 1000 2-1
Configuration Rules for Fast Ethernet 2-2
Configuration Rules with Full Duplex 2-2
Installing the Switch 1000 2-4
Rack Mounting 2-4
Stacking the Switch and Other Units 2-4
Wall Mounting 2-5
Powering-up the Switch 2-6
Connecting a Redundant Power System (RPS) 2-6
Connecting Equipment to the Console Port 2-7
Connecting a VT100 Terminal 2-7
Connecting a VT100 Terminal Emulator 2-7
Connecting a Workstation Running SLIP 2-8
3
4
Setting Up Users 4-2
Creating a New User 4-3
Deleting a User 4-4
Editing User Details 4-5
Assigning Local Security 4-6
Choosing a Switch Management Level 4-7
Setting Up the Switch Unit 4-9
Setting Up the Switch Ports 4-12
Setting Up the Switch Database (SDB) 4-16
The Database View 4-17
Searching the Switch Database 4-18
By MAC Address 4-18
By Port 4-18
Adding an Entry into the SDB 4-18
Deleting an Entry from the SDB 4-18
Specifying that an Entry is Permanent 4-18
Setting Up Resilient Links 4-19
Configuring Resilient Links 4-20
Creating a Resilient Link Pair 4-21
Deleting a Resilient Link 4-21
Viewing the Resilient Setup 4-22
Setting Up Traps 4-24
Setting Up the Console Port 4-25
Resetting the Switch 4-27
Initializing the Switch 4-28
Upgrading Software 4-29
SETTING UP FOR M ANAGEMENT
Methods of Managing the Switch 1000 3-1
Using the VT100 Management Interface 3-1
Using Telnet 3-2
Managing Over The Network 3-2
IP Addresses 3-2
Obtaining a Registered IP Address 3-3
Navigating the VT100 Screens 3-4
Screen Conventions 3-4
Keyboard Shortcuts 3-5
Correcting Text Entry 3-5
Setting Up the Switch for Management 3-6
Logging On 3-7
After Logging On 3-8
Switch Management Setup 3-9
Logging Off 3-12
Auto Logout 3-12
MANAGING THE SWITCH 1000
5
ADVANCED MANAGEMENT
Virtual LANs (VLANs) 5-1
What are VLANs? 5-1
Benefits of VLANs 5-1
How VLANs Ease Change and Movement 5-2
How VLANs Control Broadcast Traffic 5-2
How VLANs Provide Extra Security 5-2
An Example 5-2
VLANs and the Switch 5-3
The Default VLAN and Moving Ports From the Default
VLAN 5-3
Connecting VLANs to a Router 5-3
Connecting Common VLANs Between Switch Units
5-3
Using AutoSelect VLAN Mode 5-3
Using Non-routable Protocols 5-5
Using Unique MAC Addresses 5-5
Extending VLANs into an ATM Network 5-5
VLAN Configurations 5-5
Example 1 5-5
Example 2 5-6
Example 3 5-7
Setting Up VLANs on the Switch 5-8
Assigning a Port to a VLAN When Using Port VLAN
Mode 5-10
Specifying a Backbone Port 5-10
Specifying that a Port is a VLT Port 5-10
Setting Up VLANs Using AutoSelect VLAN Mode 5-11
Specifying Information About the VLAN Server 5-11
Specifying AutoSelect VLAN Mode 5-11
Spanning Tree Protocol 5-12
What is STP? 5-12
How STP Works 5-14
STP Initialization 5-14
STP Stabilization 5-14
STP Reconfiguration 5-14
An Example 5-15
STP Configurations 5-16
Enabling STP on the Switch 5-17
Configuring STP on the Switch 5-18
Configuring the STP Parameters of VLANs 5-18
Configuring the STP Parameters of Ports 5-20
RMON 5-22
What is RMON? 5-22
About the RMON Groups 5-23
Statistics 5-23
History 5-23
Alarms 5-23
Hosts 5-23
Hosts Top N 5-23
Matrix 5-24
Filter 5-24
Capture 5-24
Events 5-24
Benefits of RMON 5-25
How RMON Improves Your Efficiency 5-25
How RMON Allows Proactive Management 5-25
How RMON Reduces the Traffic Load 5-25
RMON and the Switch 5-26
RMON Features of the Switch 5-26
About Alarm Actions 5-28
About Default Alarm Settings 5-29
About the Audit Log 5-29
6
STATUS M ONITORING AND STATISTICS
Summary Statistics 6-2
Port Statistics 6-3
Port Traffic Statistics 6-4
Port Error Analysis 6-6
Status Monitoring 6-8
Fault Log 6-9
Remote Polling 6-10
A
SAFETY INFORMATION
Important Safety Information A-1
Power Supply and Fuse A-3
Sockets for Redundant Power System (RPS) A-3
RJ45 Ports A-3
Fiber Ports A-3
L’information de Sécurité Importante A-4
La Source de Courant et Le Fusible A-5
Socle Pour Alimentation Multiple A-5
Les Ports RJ45 A-6
Les Ports Fibre A-6
Wichtige Sicherheitsinformationen A-7
Stromversorgung und Sicherung A-8
Steckdose für Redundant Power System (RPS) A-8
RJ45 Anschlußen A-8
Glasfaser Anschlußen A-8
B
SCREEN ACCESS RIGHTS
C
TROUBLE-SHOOTING
LEDs C-1
Using the VT100 Interface C-2
Using the Switch C-3
D
PIN-OUTS
Null Modem Cable D-1
PC-AT Serial Cable D-1
Modem Cable D-2
RJ45 Pin Assignments D-2
E
SWITCH 1000 TECHNICAL SPECIFICATIONS
F
TECHNICAL SUPPORT
Online Technical Services F-1
World Wide Web Site F-1
3Com Bulletin Board Service F-1
Access by Analog Modem F-1
Access by Digital Modem F-2
3ComFacts Automated Fax Service F-2
3ComForum on CompuServe Online Service F-2
Support from Your Network Supplier F-3
Support from 3Com F-3
Returning Products for Repair F-4
GLOSSARY
INDEX
3COM CORPORATION LIMITED WARRANTY
ELECTRO-MAGNETIC COMPATIBILITY
ABOUT THIS GUIDE
About This Guide provides an overview of this
guide, describes the guide conventions, tells you
where to look for specific information and lists other
publications that may be useful.
Introduction
This guide provides the information you need to
install and configure the SuperStack® II Switch 1000
24 Port (3C16900A) and the SuperStack II Switch
1000 12 Port (3C16901A) with v3.1 agent software.
The functionality of both units is identical, although
the local management screens reflect the different
number of ports. Where appropriate, these differences are noted.
The guide is intended for use by network administrators who are responsible for installing and setting up network equipment; consequently, it
assumes a basic working knowledge of Local Area
Networks.
If the information in the Release Notes shipped
with your product differs from the information in
this guide, follow the Release Notes.
Throughout this guide, the SuperStack II Switch
1000 is referred to as the Switch 1000 or Switch.
How to Use This Guide
This table shows where to find specific information
in this guide.
If you are looking for...
Turn to...
An overview of the Switch 1000
Chapter 1
Information about installing the Switch 1000 into
your network
Chapter 2
Information about the methods you can use to manage the Switch 1000
Chapter 3
Information about managing the Switch 1000
Chapter 4
Information about more advanced management features; for example VLANs, Spanning Tree and RMON
Chapter 5
Information about monitoring the status of the
Switch 1000
Chapter 6
Safety information
Appendix A
Information about the access rights for each VT100
screen
Appendix B
Trouble-shooting information
Appendix C
Information about the pin-outs relating to the Switch
1000
Appendix D
Information about the Technical Specifications of the
Switch 1000
Appendix E
Information about the Technical Support available
from 3Com
Appendix F
2
ABOUT THIS GUIDE
Table 2
Conventions
Notice Icons
Icon
Table 1 and Table 2 list conventions that are used
throughout this guide.
Table 1
Text Conventions
Convention
Description
Screen
displays
This typeface represents information as it
appears on the screen.
The words
“enter”
and “type”
When you see the word “enter” in this guide,
you must type something, and then press the
Return or Enter key. Do not press the Return or
Enter key when an instruction simply says
“type.”
[Key] names
Key names appear in text in one of two ways:
■
■
Referred to by their labels, such as “the
Return key” or “the Escape key”
Press [Ctrl]+[Alt]+[Del].
Menu commands
and buttons
Words in italicized
type
Italics emphasize a point or denote new terms at
the place where they are defined in the text.
Words in
bold-face type
Bold text denotes key features.
Information
note
Important features or instructions
Caution
Risk of personal injury, system damage,
or loss of data
Warning
Risk of severe personal injury
The Switch 1000 document set includes:
■
SuperStack II Switch 1000 Quick Reference
Guide.
Document Number DQA1690-0AAA0x
■
SuperStack II Switch 1000 Quick Installation
Guide.
Document Number DIA1690-0AAA0x
■
SuperStack II Switch 1000 Release Notes.
Document Number DNA1690-0AAA0x
Menu commands or button names appear in
italics. Example:
From the Help menu, select Contents.
Alerts you to...
Related Documentation
Written with brackets, such as [Return] or
[Esc].
If you must press two or more keys simultaneously, the key names are linked with a plus
sign (+). Example:
Notice Type
Other publications you may find useful:
■
Documentation accompanying the
Plug-in Modules.
■
Documentation accompanying the Redundant
Power System.
1
GETTING STARTED
■
Full duplex on all fixed Ethernet and Fast Ethernet
ports, and Fast Ethernet Plug-in Module ports
■
Security
■
Resilient Links
■
Support for 16 Virtual LANs (VLANs)
■
Spanning Tree Protocol (STP) per VLAN
■
PACE (Priority Access Control Enabled) for supporting multimedia applications over Ethernet
■
3Com’s SuperStack II architecture:
About the Switch 1000
Part of 3Com’s SuperStack® II range of products,
the Switch 1000 is designed to overcome the
common problem of insufficient bandwidth for
today’s growing network applications, while providing low-cost, high performance networking with
little need for configuration. Use the Switch 1000 to
provide your users with greater bandwidth, faster
throughput and high speed links.
The SuperStack II Switch 1000 is a revision of the
LinkSwitch 1000.
Summary of Features
The Switch 1000 has the following features:
■
12 or 24 Ethernet 10BASE-T ports
■
Fast Ethernet 100BASE-TX port
■
Plug-in Module slot (Asynchronous Transfer
Mode (ATM) and Fast Ethernet)
■
Transceiver Module slot (10Mbps Ethernet)
■
Support for up to 500 endstations, unlimited stations on backbone port
■
Four forwarding modes for packets
■
Intelligent Flow Management for congestion
control
■
■
Connects to Redundant Power System
■
Integrated network management
■
19-inch rack or stand-alone mounting
SmartAgent support:
■
IP and IPX management over SNMP
■
RMON
■
Repeater and Bridge MIB
■
Broadcast storm control
■
Easy software upgrades
■
BOOTP for automatic IP address configuration
■
Local management
1-2
CHAPTER 1: GETTING STARTED
Port Connections
10BASE-T Ports
The Switch has 12 or 24 10BASE-T ports configured as MDIX (cross-over), which provide a full
10Mbps bandwidth to attached endstations. Maximum segment length is 100m (328ft) over grade 3,
4, or 5 twisted pair cable.
As these ports are configured as MDIX (cross-over),
you need to use a cross-over cable to connect to
devices whose ports are MDIX-only. Most of the
10BASE-T ports in 3Com devices are MDIX-only.
100BASE-TX Port
The Switch has a single Fast Ethernet 100BASE-TX
port configured as MDIX (cross-over), which provides
a 100Mbps connection to, for example, a local
server. The maximum segment length is 100m
(328ft) over grade 5 twisted pair cable.
As this port is configured as MDIX (cross-over), you
need to use a cross-over cable to connect to devices
whose ports are MDIX-only. Most of the
100BASE-TX ports in 3Com devices are MDIX-only.
Plug-in Module
A slot at the rear of the unit can take a Plug-in
Module, providing an additional high-speed port.
This could be used, for example, to provide a Fast
Ethernet or Asynchronous Transfer Mode (ATM)
backbone connection to the rest of your network.
Transceiver Module
A slot at the rear of the unit allows you to install
any of the 3Com 10Mbps Ethernet Transceiver Modules. When a Transceiver Module is fitted, port 1
automatically switches to become the Transceiver
Module port. The Transceiver Module can provide a
10Mbps link to the rest of your network.
Backbone Port
The Switch allows you to specify any port to be a
backbone port with the following attributes:
■
Frames with unknown addresses received by the
Switch are forwarded to the port.
■
Addresses received on the port are not stored in
the Switch Database (the database which contains the device addresses received by the
Switch).
A backbone port is typically used to connect the
Switch to the backbone of large networks (over 500
MAC addresses). For information about how to
specify a backbone port for a new or initialized
Switch, refer to “Setting Up the Switch Unit” on
page 4-9.
You can specify one backbone port for each VLAN
defined on the Switch. For more information about
how to specify a backbone port for a VLAN, refer to
“Setting Up VLANs on the Switch” on page 5-8.
About the Switch 1000
Switch Operation and Features
Forwarding of Packets
How Does the Switch Compare to a Bridge?
The table below shows how Switch 1000 operation
compares to that of a conventional IEEE 802.1d
bridge.
Address Learning
Forwarding Mode
IEEE 802.1d Bridge
Switch 1000
All ports
All ports except backbone port
Store and forward
Discard packets
Operation when
packet buffers full
1-3
The table below shows how a packet is processed
when it arrives at the Switch 1000.
Packet Source
Destination
Address
Action
Any port EXCEPT backbone (Unicast packet)
Unknown
Forward to backbone port only, or
forward to all ports
Same port as
source address
Filter
Another port (not
backbone)
Forward to specific
port only
Fast Forward, Fragment Free, Store and
forward, or Intelligent
Invoke Intelligent
Flow Management to
suppress transmissions at source
Any port EXCEPT backbone (Multi/Broadcast
packet)
Not applicable
Forward to all ports
(including backbone) in the same
VLAN as source port
Backbone port
(Unicast packet)
Unknown
Filter
Known port (not
backbone)
Forward to known
port only
Not applicable
Forward to all ports
within specific VLAN
Spanning Tree
Supported
Optional
Action on
Unknown
Destination
Address
Flood all ports
Forward to backbone
port, or forward to
all ports
Database size
4000 addresses
500 addresses
In all other ways, Switch 1000 and bridge operation is identical.
Backbone port
(Multi/Broadcast packet)
You can configure the Switch to forward packets
with an unknown destination address to all ports in
the same VLAN as the source port. Refer to “Setting
Up the Switch Unit” on page 4-9 for more information.
1-4
CHAPTER 1: GETTING STARTED
To best suit your networking requirements, the
Switch 1000 allows you to select one of four frame
forwarding modes:
■
■
■
■
Fast Forward — Frames are forwarded as soon
as the destination address is received and verified.
The forwarding delay, or latency, for all frames in
this mode is just 40µs, but with the lack of
checking time any error frames received are propagated through the switch.
Fragment Free — A minimum of 64 bytes of the
received frame is buffered prior to the frame
being forwarded. This ensures that collision fragments are not propagated through the network.
The forwarding delay, or latency, for all frames in
this mode is 64µs.
Store and Forward — Received packets are buffered in their entirety prior to forwarding. This
ensures that only good frames are passed to their
destination. The forwarding delay for this mode
varies between 64µs and 1.2ms, depending on
frame length. In Store and Forward mode, latency
is measured as the time between receiving the
last bit of the frame and transmitting the first bit.
For the Switch 1000, this is 8µs.
Intelligent — The Switch monitors the amount
of error traffic on the network and changes the
forwarding mode accordingly. If the Switch
detects less than 18 errors a second, it operates
in Fast Forward mode. If the Switch detects 18 or
more errors a second, it operates in Store and
Forward mode until the number of errors a
second returns to zero.
For more information about selecting forwarding
modes, refer to “Setting Up the Switch Unit” on
page 4-9.
Intelligent Flow Management
Intelligent Flow Management (IFM) is a system for
controlling congestion on your network. Congestion can be caused by one or more devices sending
traffic to an already busy port on the Switch 1000.
If a port on the Switch 1000 is connected to
another switch or endstation, IFM prevents packet
loss and inhibits the device from generating more
packets until the period of congestion ends.
IFM should be enabled on a port if it is connected
to another switch, or an endstation. IFM should be
disabled on a port connected to a repeater.
For more information about enabling IFM, refer to
“Setting Up the Switch Ports” on page 4-12.
Full Duplex
The Switch 1000 provides full duplex support for all
its fixed ports, and Fast Ethernet Plug-in Module
ports. Full duplex allows frames to be transmitted
and received simultaneously and, in effect, doubles
the potential throughput of a link. In addition, full
duplex also supports 100BASE-FX cable runs of up
to 2km (6562ft).
Full duplex can be enabled on all the relevant ports,
all the Fast Ethernet ports, or on individual ports. It
is not supported by the Transceiver Module.
About the Switch 1000
For more information about enabling full duplex,
refer to “Setting Up the Switch Unit” and “Setting
Up the Switch Ports” in Chapter 4.
Security
The Switch 1000 contains advanced security features which guard against users connecting unauthorized endstations to your network. When security
is enabled on a port, it enters single address learning mode. In this mode, the port learns a single
Ethernet address; once this is learned, the port is
disabled if a different address is seen on the port.
Until security is disabled, no other address can be
learned.
Virtual LANs
The Switch 1000 has a Virtual LAN (VLAN) feature
which allows you to build your network segments
without being restricted by physical connections. A
VLAN is defined as a group of location- and
topology-independent devices that communicate as
if they are on the same physical LAN. Implementing
VLANs on your network has three main advantages:
■
It eases the change and movement of devices on
IP networks. If an endstation in VLAN 1 is moved
to a port in another part of the network, you
only need to specify that the new port is in
VLAN 1.
■
It helps to control broadcast traffic. If an endstation in VLAN 1 transmits a broadcast frame,
then only VLAN 1 devices receive the frame.
■
It provides extra security. Devices in VLAN 1 can
only communicate with devices in VLAN 2 using
a router.
For more information about security, refer to “Setting Up the Switch Ports” on page 4-12.
Resilient Links
The Resilient Link feature in the Switch 1000
enables you to protect critical links and prevent network downtime should those links fail.
Setting up resilience ensures that should a main
communication link fail, a standby duplicate link
immediately and automatically takes over the task of
the main link. Each main and standby link pair is
referred to as a resilient link pair.
For more information about resilient links, refer to
“Setting Up Resilient Links” on page 4-19.
1-5
For more information about setting up VLANs on
the Switch, refer to “Virtual LANs (VLANs)” on page
5-1.
Spanning Tree Protocol
The Switch 1000 supports the Spanning Tree Protocol (STP) which is a bridge-based system for providing fault tolerance on networks. STP allows you to
implement parallel paths for network traffic, and
ensure that:
■
Redundant paths are disabled when the main
paths are operational.
1-6
CHAPTER 1: GETTING STARTED
■
Redundant paths are enabled if the main traffic
paths fail.
For more information about STP, refer to “Spanning
Tree Protocol” on page 5-12.
PACE
The Switch 1000 supports PACE (Priority Access
Control Enabled) technology, which allows multimedia traffic to be carried over standard Ethernet and
Fast Ethernet LANs. PACE provides two features:
■
■
Implicit Class of Service — When multimedia traffic is transmitted, it is given a higher priority
than other data and is therefore forwarded ahead
of other data when it arrives at the Switch. The
Implicit Class of Service feature minimizes latency
through the Switch and protects the quality of
multimedia traffic.
Interactive Access — When two-way multimedia
traffic passes over an Ethernet network, interference can occur because access to the bandwidth
is unequally allocated to traffic in one direction.
The Interactive Access feature allocates the available bandwidth equally in both directions, therefore increasing the quality of the traffic.
For more information about setting up PACE on the
Switch, refer to “Setting Up the Switch Unit” and
“Setting Up the Switch Ports” in Chapter 4.
Switch 1000 on Your Network
Server Connections
When connecting servers to the Switch 1000, use
the following rules to ensure that the Switch is
operating at maximum efficiency:
■
Ideally, any local server should be connected to
the Switch using a 100Mbps port.
■
If that is not possible, connect the local server to
a dedicated 10Mbps port.
■
If that is not possible and the local server is connected to a repeated segment where the traffic is
mainly local to that segment, disable Intelligent
Flow Management (IFM) on the port to which the
repeater is connected.
If your network is running a peer-to-peer protocol
(for example, Windows 95) and you have multiple
endstations connected to the Switch via a repeater,
we recommend that you disable IFM on the port to
which the repeater is connected.
Network Configuration Examples
The following illustrations show some examples of
how the Switch can be placed on your network.
Examples of how the Switch 1000 can be used in a
VLAN-based network are given in Chapter 5.
Switch 1000 on Your Network
Network Segmentation I
This example shows how the Switch 1000 fits into
a large corporate network with a Fast Ethernet
infrastructure. A Switch is positioned on each floor
and servers are centralized in the basement.
Figure 1-1
The Switch 1000 in a large corporate network
1-7
1-8
CHAPTER 1: GETTING STARTED
Network Segmentation II
This example shows the Switch 1000 in a second
workgroup situation. This setup could be that of a
small office within a large corporation, or part of a
larger corporate network. Most of the switch ports
have multiple endstations.
Figure 1-2
The Switch 1000 in a workgroup
Switch 1000 on Your Network
Desktop Switching
This example shows Switch 1000 used for a group of
heavy-traffic users in a large corporate network. Here
switching is brought to the desktop with a single
endstation per switch port. A local server is connected
using the 100Mbps Fast Ethernet link.
Figure 1-3
The Switch 1000 as a desktop switch
1-9
1-10
CHAPTER 1: GETTING STARTED
Unit Overview — Front
Figure 1-4
Switch 1000 front view: 3C16901A top, 3C16900A bottom
Unit Overview — Front
10BASE-T Ports
The Switch has 12 or 24 10BASE-T RJ45 ports configured as MDIX (cross-over), which provide a full
10Mbps bandwidth to attached endstations. The
maximum segment length is 100m (328ft) over category 3, 4, or 5 UTP cable.
As these ports are configured as MDIX (cross-over),
you need to use a cross-over cable to connect to
devices whose ports are MDIX-only. Most of the
10BASE-T ports in 3Com devices are MDIX-only.
100BASE-TX Port
The Switch has a single Fast Ethernet 100BASE-TX
RJ45 port configured as MDIX (cross-over), which
provides a 100Mbps connection to, for example, a
local server. The maximum segment length is 100m
(328ft) over category 5 UTP or STP cable.
LED
Color
Indicates
TCVR
Yellow
Port 1 is a Transceiver Module fitted to the
rear of the unit.
Port Status LEDs
Packet
Yellow
Frames are being transmitted/received on the
port.
Status
Green
Link is present; port is enabled.
Green flashing
Link is present; port is disabled.
Off
Link is not present.
Plug-in Module Status LEDs
Packet
Yellow
Frames are being transmitted/received on the
Plug-in Module port.
Status
Green
Link is present; port is enabled.
Green flashing
Link is present; port is disabled.
Green flashing
(long on, short
off)
Refer to the “SuperStack II Switch ATM
OC-3c Module User Guide”.
Yellow
Plug-in Module has failed its Power On Self
Test (if the MGMT LED is flashing yellow), or
the agent software of the Plug-in Module is
not installed correctly.
As this port is configured as MDIX (cross-over), you
need to use a cross-over cable to connect to devices
whose ports are MDIX-only. Most of the
100BASE-TX ports in 3Com devices are MDIX-only.
Yellow flashing
Plug-in Module is not recognized.
Off
Link is not present or Plug-in Module is not
installed in the Switch.
LEDs
The table below describes the LED behavior on the
Switch. For more details about corrective action in
the event of a problem, refer to “LEDs” on page
C-1.
1-11
Unit Status LEDs
Power
Green
Switch is powered-up.
MGMT
Green
Switch is operating normally.
Green flashing
Switch or Plug-in Module is either downloading software or initializing (which
includes a Power On Self Test).
Yellow
Switch has failed its Power On Self Test.
Yellow flashing
Plug-in Module has failed its Power On Self
Test.
1-12
CHAPTER 1: GETTING STARTED
Unit Overview — Rear
Figure 1-5
Switch 1000 rear view
Unit Overview — Rear
Power Socket
The Switch 1000 automatically adjusts to the
supply voltage. The fuse is suitable for both 110V
A.C. and 220–240V A.C. operation. For information on replacing fuses, refer to Appendix A.
Unit Serial Number
You may need this serial number for fault reporting
purposes.
Redundant Power System Socket
Use one of these sockets to connect a SuperStack II
Redundant Power System (RPS) to the unit. You can
use either socket. Refer to “Connecting a Redundant Power System (RPS)” on page 2-6.
Reset Button
Using the reset button simulates a power-off/on
cycle. This has the same effect as carrying out a
reset via the VT100 interface; refer to “Resetting the
Switch” on page 4-27.
Console Port
Connect a terminal to the console port to carry out
remote or local out-of-band configuration and management. The console port is set to auto-baud, 8
data bits, no parity, and 1 stop bit.
1-13
Plug-in Module Slot
Use this slot to install a Plug-in Module. The Module
can be used to provide a high speed link to the rest
of your network. 3Com provides a range of Plug-in
Modules; contact your supplier for availability.
When a Plug-in Module is not installed, ensure the
blanking plate is secured in place.
Transceiver Module Slot
Use this slot to connect a Transceiver Module and
provide a 10Mbps link to the rest of the network.
Port 1 is automatically switched from the front
10BASE-T port to the Transceiver Module port
when a Module is installed. 3Com provides a range
of Transceiver Modules; contact your supplier for
availability.
When a Transceiver Module is not installed, ensure
the blanking plate is secured in place.
Ethernet Address
This label shows the unique Ethernet (or MAC)
address assigned to the unit.
1-14
CHAPTER 1: GETTING STARTED
Unit Defaults
Managing the Switch 1000
The following table shows the factory defaults for
the Switch 1000 features.
Port Status
Enabled
Forwarding Mode
Fast Forward
Intelligent Flow
Management
Enabled
Duplex Mode
Half duplex on all relevant ports
Virtual LANs
All ports use Port VLAN Mode and belong to
the Default VLAN (VLAN 1)
PACE
Disabled
Spanning Tree (STP)
Disabled
Power On Self Test
(POST)
Normal (Fast Boot)
System Alarm
(broadcast bandwidth used)
Enabled
System Alarm
(errors per 10,000
packets)
Enabled
System Alarm
(bandwidth used)
System Alarm
(percentage of
frames forwarded)
■
High threshold: 20% — Notify and Blip
■
Low threshold: 10% — No action
■
High threshold: 2% — Notify
■
Low threshold: 1% — No action
Enabled
■
High threshold: 85% — No action
■
Low threshold: 50% — No action
Enabled
■
High threshold: 85% — No action
■
Low threshold: 50% — No action
The menu-driven interface built into the Switch
1000 is known as the VT100 interface. You can
access it using a VT100 terminal, or a PC using terminal emulation software. You can connect the terminal directly to the Switch or through a modem.
You can also access the VT100 interface remotely
using Telnet running over the TCP/IP protocol.
Remote management is also possible using a Network Manager from 3Com’s Transcend® product
range. The management protocol is SNMP (Simple
Network Management Protocol) and any
SNMP-based management facility can manage the
unit if the Management Information Base (MIB) is
installed correctly in the management workstation.
The Switch 1000 supports SNMP over both IP and
IPX protocols.
Quick Start For SNMP Users
1-15
3 At the Main Banner screen, press [Return] to dis-
Quick Start For SNMP Users
This section describes how to get started if you
want to use an SNMP Network Manager to
manage the Switch. It assumes you are already
familiar with SNMP management.
■
■
■
If you are using IP and you have a BOOTP server
set up correctly on your network, the IP address
for the Switch is detected automatically and you
can start managing the Switch without any further configuration.
If you are using the IPX protocol, the Switch
1000 is allocated an IPX address automatically.
You can start the SNMP Network Manager and
begin managing the Switch.
If you are using IP without a BOOTP server, you
must enter the IP address of the Switch before
the SNMP Network Manager can communicate
with the device. To do this, refer to “Entering an
IP Address for the Switch” below.
If you need more information about IP and IPX, refer
to “Managing Over The Network” on page 3-2.
Entering an IP Address for the Switch
1 Connect a terminal to the console port of the
Switch 1000, refer to “Connecting a VT100 Terminal” on page 2-7. The terminal should be configured to 9600 line speed (baud rate), 8 data bits, no
parity, and 1 stop bit.
2 Press [Return] one or more times until the Main
Banner screen appears.
play the Logon screen. Log on using the default
user name admin (no password is required). Select
OK.
4 The Main Menu is displayed. From this menu, select
the MANAGEMENT SETUP option. The Switch Management Setup screen is displayed.
5 On the Management Setup screen, fill in the follow-
ing fields:
■
Device IP Address
■
Device SubNet Mask (if necessary)
■
Default Router (if necessary)
For further information on the Management Setup
screen, refer to “Setting Up the Switch for Management” on page 3-6.
6 If you need the Switch 1000 to send SNMP traps to
the Network Manager, you may need to set up the
address of the Network Manager in the Trap Table.
Refer to “Setting Up Traps” on page 4-24.
3Com Network Managers such as Transcend Enterprise Manager for Windows may automatically configure the Switch 1000 to send traps to them.
Please read the documentation supplied with your
network management software.
7 When you have finished with the Management
Setup screen, select OK.
1-16
CHAPTER 1: GETTING STARTED
2
INSTALLATION AND SETUP
■
Following Safety Information
Before installing or removing any components from
the Switch, or carrying out any maintenance procedures, you must read the safety information provided in Appendix A of this guide.
■
■
When deciding where to position the unit, ensure
that:
■
You are able to meet the configuration rules
detailed in the following section.
■
The unit is accessible and cables can be connected easily.
Sources of electrical noise such as radios,
transmitters and broadband amplifiers.
Power lines and fluorescent lighting fixtures.
■
Water or moisture cannot enter the case of the
unit.
■
Air-flow around the unit and through the vents in
the side of the case is not restricted. We recommend that you provide a minimum 25mm (1in.)
clearance.
■
No objects are placed on top of the unit.
■
Units are not stacked more than four high if
free-standing.
Positioning the Switch 1000
The Switch is suited for use in the office where it
can be wall-mounted, mounted in a standard
19-inch equipment rack, or free standing. Alternatively, the unit can be rack-mounted in a wiring
closet or equipment room. A wall-mounting /
rack-mounting kit, containing two mounting brackets and six screws, is supplied with the Switch.
Cabling is away from:
2-2
CHAPTER 2: INSTALLATION AND SETUP
Configuration Rules for Fast Ethernet
The topology rules for 100Mbps Fast Ethernet are
slightly different to those for 10Mbps Ethernet.
Figure 2-1 illustrates the key topology rules and provides examples of how they allow for large-scale
Fast Ethernet networks.
The key topology rules are:
■
Maximum UTP cable length is 100m (328ft) over
category 5 cable.
■
A 412m (1352ft) fiber run is allowed for connecting switch to switch, or endstation to switch,
using half-duplex 100BASE-FX.
■
A total network span of 325m (1066ft) is allowed
in single-repeater topologies (one hub stack per
wiring closet with a fiber run to the collapsed
backbone). For example, a 225m (738ft) fiber
downlink from a repeater to a router or switch,
plus 100m (328ft) UTP run from a repeater out to
the endstations.
Configuration Rules with Full Duplex
The Switch provides full duplex support for all its
fixed Ethernet and Fast Ethernet ports, and Fast
Ethernet Plug-in Module ports. Full duplex allows
frames to be transmitted and received simultaneously and, in effect, doubles the potential
throughput of a link.
With full duplex, the Ethernet topology rules are the
same, but the Fast Ethernet rules are:
■
Maximum UTP cable length is 100m (328ft) over
category 5 cable
■
A 2km (6562ft) fiber run is allowed for connecting switch-to-switch, or endstation-to-switch
Configuration Rules with Full Duplex
Figure 2-1
Fast Ethernet configuration rules
2-3
2-4
CHAPTER 2: INSTALLATION AND SETUP
3 Insert the three screws and fully tighten with a suit-
Installing the Switch 1000
Rack Mounting
The Switch is 1.5U high and fits in most standard
19-inch racks.
CAUTION: Disconnect all cables from the Switch
before continuing. Remove all self adhesive pads
from the underside of the unit, if fitted.
1 Place the unit the right way up on a hard flat sur-
face, with the front facing towards you.
2 Locate a mounting bracket over the mounting
holes on one side of the unit, as shown in
Figure 2-2.
Figure 2-2
Fitting a bracket for rack mounting
able screwdriver.
4 Repeat steps 2 and 3 for the other side of the unit.
5 Insert the unit into the 19-inch rack and secure with
suitable screws (not provided). Ensure that ventilation holes are not obstructed.
6 Connect network cabling.
Stacking the Switch and Other Units
If the units are free standing, up to four units can
be placed on top of one another. If mixing a variety
of SuperStack II Switch and Hub units, the smaller
units must be positioned at the top.
The Switch is supplied with four self-adhesive rubber
pads. Apply the pads to the underside of the unit,
stick one in the marked area at each corner of the
unit. Place the units on top of each other, ensuring
that the pads of the upper unit line up with the
recesses of the lower unit.
Installing the Switch 1000
Wall Mounting
A single Switch can be wall-mounted.
CAUTION: Disconnect any cables from the unit
before continuing. Remove self-adhesive pads from
the underside of the unit if they have been previously fitted.
1 Place the Switch the right way up on a hard flat sur-
face, with the front facing towards you.
2 Locate a mounting bracket over the mounting
holes on one side of the unit, as shown in
Figure 2-3.
3 Insert the two screws and tighten with a suitable
screwdriver.
4 Repeat for the other side of the unit.
5 Ensure that the wall you are going to use is smooth,
flat, dry and sturdy. Attach a piece of plywood,
approximately 305mm x 510mm x 12mm (12in. x
20in. x 0.5in.) securely to the wall if necessary, and
mount the Switch as follows:
a Position the base of the unit against the wall (or
plywood) ensuring that the ventilation holes face
sidewards. Mark on the wall the position of the
screw holes in both wall brackets. Drill the four
holes.
b Using suitable fixings and screws (not provided),
attach the Switch unit securely to the wall or plywood.
c Connect network cabling.
Figure 2-3
Fitting a bracket for wall mounting
2-5
2-6
CHAPTER 2: INSTALLATION AND SETUP
Powering-up the Switch
1 Connect the power cord to the IEC socket on the
rear of the Switch, and to your mains socket.
The Switch has no ON/OFF switch; the only method
of connecting or disconnecting mains power is
through the power cord.
2 The Switch enters a Power On Self Test (POST). The
time taken for the test to complete is dependent
on the type of POST configured (refer to “Switch
Management Setup” on page 3-9 for details of how
to configure the type of POST). For a new Switch
that is being installed for the first time, power-up
takes approximately 13 seconds.
3 Check the status LEDs to ensure the Switch is oper-
ating correctly (refer to “LEDs” on page 1-11).
Connecting a Redundant Power System (RPS)
You can connect a SuperStack ® II Redundant Power
System (RPS) to the Switch.
At +5V, the current requirement for the Switch is
4.8A, including any Transceiver Module that might
be fitted, but excluding a Plug-in Module. Check the
documentation supplied with your Plug-in Module
for power consumption figures.
For most configurations, you need only one Superstack II RPS output, and this can be connected to
either of the two sockets on the rear of the unit.
If the current consumption of the Switch plus any
Plug-in Module exceeds the capability of the RPS
(8.5A), you need a SuperStack II Advanced RPS with
one Advanced RPS 100W Module.
If the RPS is used incorrectly, its Output Fault LED
lights yellow.
You should check the documentation supplied with
the RPS or Advanced RPS to see if the outputs can
be used in parallel.
Connecting Equipment to the Console Port
Connecting Equipment to the Console Port
The Switch console port settings are set to:
■
8 data bits
■
no parity
■
1 stop bit
The terminal connected to the console port on the
Switch must be configured with the same settings.
This procedure is described in the documentation
supplied with the terminal. If you have enabled
auto-configuration for the Switch, the terminal’s
line speed (baud rate) is detected automatically.
Connection to the console port can be direct for
local management, or through a modem for
remote management. The maximum baud rate the
auto-configuration detects is 19,200 baud.
2-7
Connecting a VT100 Terminal
To connect a VT100 terminal directly to the console
port on the Switch, you need a standard null
modem cable:
1 Connect one end of the cable to the console port
on the Switch, and the other to the console port on
the VT100 terminal.
2 Ensure that your terminal is set to:
■
8 data bits
■
no parity
■
1 stop bit
If auto-configuration is enabled for the Switch, the
terminal’s line speed (baud rate) is detected automatically.
Connecting a VT100 Terminal Emulator
1 Ensure that the workstation is running a suitable
Appropriate cables are available from your local supplier. If you need to make your own cables, pin-outs
are detailed in Appendix D.
terminal emulation package. There are many available; contact your local supplier for further details.
2 If you are using a PC, you need a null modem
cable with an appropriate connector. Connect one
end of the cable to the workstation, and the other
end to the console port on the Switch.
3 Ensure that your workstation is set to:
■
8 data bits
■
no parity
■
1 stop bit
If auto-configuration is enabled for the Switch, the
workstation’s line speed (baud rate) is detected
automatically.
2-8
CHAPTER 2: INSTALLATION AND SETUP
Connecting a Workstation Running SLIP
You can communicate with the Switch via the console port from a workstation running SLIP (Serial
Line Internet Protocol). In this way, you can perform
out-of-band management using Telnet or SNMP.
Cables required for this connection depend on the
type of workstation you are using. You must configure the workstation to run SLIP. Refer to the documentation supplied with the workstation for more
details.
You must configure the console port of the Switch
to accept SLIP and set up the SLIP parameters
(address and subnet mask). Refer to “Switch Management Setup” on page 3-9.
You may need a 5-wire cable when running SLIP.
Two of the wires are required for Flow Control.
3
SETTING UP
FOR
MANAGEMENT
Methods of Managing the Switch 1000
You can manage the Switch in four ways:
■
Using the VT100 interface by connecting a VT100
terminal (or workstation with terminal emulation
software) to the Switch console port.
■
Using the VT100 interface over a TCP/IP network
using a workstation running VT100 terminal
emulation and Telnet.
■
Using the VT100 interface by connecting a workstation running SLIP to the Switch console port.
■
Using an SNMP Network Manager over a network running either the IP or IPX protocol. Each
Network Manager provides its own user interface to the management facilities.
Using the VT100 Management Interface
The menu-driven user interface built into the
Switch is known as the VT100 or Local Management interface. The VT100 management interface
provides a forms-based structure with pre-defined
security levels, enabling access to be restricted to
particular users. The Switch can support up to four
management user sessions concurrently (for example
one console port and three Telnet connections).
You can establish VT100 management communication with the Switch through two different interfaces:
■
Via the Console Port — You can access the
local management interface using a VT100 terminal, or PC using suitable terminal emulation software. The terminal can be connected directly to
the Switch, or through a modem. You can also
connect a management workstation running SLIP
to the console port, which allows you to use
out-of-band Telnet. The workstation can be connected directly or remotely, through a modem.
This method provides a way of managing the
Switch in situations where the LAN is not providing a reliable service, where the Network Manager does not have direct LAN connectivity, or
when a Network Manager does not support
SNMP.
■
Via a Network Connection — The local management facility is also accessible via Telnet over a
network running the TCP/IP protocol. The management available through Telnet is exactly the
same as that of a locally connected terminal. The
Telnet application requires a VT100 terminal, or
PC using suitable terminal emulation software.
3-2
CHAPTER 3: SETTING UP FOR MANAGEMENT
Using Telnet
Any Telnet facility that emulates a VT100 terminal
should be able to communicate with the Switch
over a TCP/IP network. Up to three active Telnet sessions can access the Switch concurrently. If a connection to a Telnet session is lost inadvertently, the
connection is closed by the Switch after 2–3 minutes of inactivity.
Before you can start a Telnet session you must set
up the IP parameters described in “Switch Management Setup” on page 3-9.
To open the Telnet session, you must specify the IP
address of the device you want to manage. Check
the user manual supplied with the Telnet facility if
you are unsure how to do this.
Once the connection is established, the main banner
of the VT100 management interface is displayed
and you can log on.
Managing Over The Network
Any Network Manager running the Simple Network
Management Protocol (SNMP) can manage the
Switch, provided the MIB (Management Information Base) is installed correctly on the management
workstation.
Each Network Manager provides its own user interface to the management facilities. 3Com's
Transcend® range of Network Managers all have
facilities for managing the Switch.
The Switch supports SNMP over both IP and IPX
protocols.
IP Addresses
If you are uncertain about IP addresses that may be
assigned to your devices, contact your network
administrator first.
To operate correctly, each device on your network
must have a unique IP address. IP addresses have
the format n.n.n.n where n is a decimal number
between 0 and 255. An example IP address is:
191.128.40.120
The IP address can be split into two parts:
■
The first part (191.128 in the example) identifies
the network on which the device resides.
■
The second part (40.120 in the example) identifies the device within the network.
Managing Over The Network
If your network is internal to your organization
only, you may use any arbitrary IP address. We suggest you use addresses in the series 191.100.X.Y,
where X and Y are numbers between 1 and 254.
Use 191.101.X.Y for the SLIP address.
If your network has a connection to the external IP
network, you will need to apply for a registered IP
address. This system ensures that every IP address
used is unique; if you do not have a registered IP
address, you may be using an identical address to
someone else and your network will not operate
correctly.
Obtaining a Registered IP Address
InterNIC Registration Services is the organization
responsible for supplying registered IP addresses.
The following contact information is correct at the
time of publication:
Network Solutions
Attn: InterNIC Registration Service
505, Huntmar Park Drive
Herndon
VA 20170
U.S.A.
Telephone: (1) (703) 742 4777
If you have access to the Internet, you can find further information about InterNIC by entering the following URL into your web browser:
http://www.internic.net
3-3
3-4
CHAPTER 3: SETTING UP FOR MANAGEMENT
Navigating the VT100 Screens
Screen Conventions
To differentiate types of information, the
VT100 screens use the following conventions:
Type of
information
Shown on screen
as...
Description
Choice Field
♦text♦
Text enclosed with markers is a list from which you can select one option only. Press [Space] to
cycle through the options. Press [Down Arrow] or [Return] to move to the next field.
Entry Field
[text]
Text enclosed in square brackets on the screen is a text entry field. A text entry field allows
you to enter text, numeric data or hexadecimal data from the keyboard. Password fields are
hidden, which means that the text you type is not shown on the screen. In some cases a text
entry field has a default entry. If you wish to replace the default, simply enter a new value for
this field; the default entry is erased. Press [Down Arrow] or [Return] to move to the next field.
Button
OK
Text for a button is always shown in uppercase letters. A button carries out an action, for
example, OK or CANCEL. To operate a button, move the cursor to the button and press
[Return].
List Box
monitor
A list box allows you to select one or more items from a list. There are several keys that allow
you to use a list box.
manager
security
■
[Return] moves the cursor to the next field and actions your selections.
■
[Space] toggles through the options in a choice field or selects and deselects an entry in the
list box. List box selections are highlighted.
■
[Down Arrow] moves item by item down the list box until it reaches the end of the list. At
the end of the list it moves the cursor to the next field.
■
[Ctrl] + [U] moves the cursor one page up the list box.
■
[Ctrl] + [D] moves the cursor one page down the list box.
Navigating the VT100 Screens
Keyboard Shortcuts
There are several special characters or combinations
of characters that allow you to make shortcuts.
[Tab] allows you to move from one field to the next,
on any screen, without making any changes.
[Return] moves you to the next field on a form after
you have made changes to the data in a field.
[Left Arrow] moves you to the previous field on the
screen or the next character in an editable field.
[Right Arrow] moves you to the next field on the
screen or the previous character in an editable field.
[Ctrl] + [R] refreshes the screen.
[Ctrl] + [B] moves the cursor to the next button.
[Ctrl] + [P] aborts the current screen and returns you
to the previous screen.
[Ctrl] + [N] actions the inputs for the current screen
and moves to the next screen.
[Ctrl] + [K] displays a list of the available key strokes.
3-5
Correcting Text Entry
Use [Delete] on a VT100 terminal or [Backspace] on
a PC. This moves the cursor one space to the left
and deletes a character.
If you are using Telnet or a terminal emulation program you may find that some of the Control keys
do not operate or that they activate other functions.
Check carefully in the manual accompanying your
Telnet or terminal emulation software before using
the Control keys.
3-6
CHAPTER 3: SETTING UP FOR MANAGEMENT
Setting Up the Switch for Management
The following sections describe how to get started if
you want to use an SNMP Network Manager to
manage the Switch. It assumes you are already
familiar with SNMP management. If not, we recommend the following publication:
“The Simple Book” by Marshall T. Rose
ISBN 0-13-812611-9
Published by Prentice Hall
■
■
■
If you are using IP and you have a BOOTP server
set up correctly on your network, the IP address
for the Switch is detected automatically and you
can start managing the Switch without any further configuration.
If you are using the IPX protocol, the Switch is
allocated an IPX address automatically. You can
start the SNMP Network Manager and begin
managing the Switch.
If you are using IP without a BOOTP server, you
must enter the IP address of the Switch before
the SNMP Network Manager can communicate
with the device. To do this, take the following
steps:
Figure 3-1
Main Banner
1 At your terminal, press [Return] two or more times
until the Switch 1000 Main Banner is displayed
(shown in Figure 3-1). The console port detects the
line speed (baud rate) from these keystrokes and
defaults to:
■
auto-baud
■
8 data bits
■
no parity
■
1 stop bit
Data bits, parity and stop bit values cannot be
changed.
2 At the Main Banner, press [Return] to display the
Logon screen.
Setting Up the Switch for Management
Logging On
At the Logon screen displayed in Figure 3-2, enter
your user name and password (note that they are
both case-sensitive):
■
If you have been assigned a user name and password, enter those details.
■
If you are logging on for the first time (after
installation or initialization), use a default user
name and password to match your access
requirements. The defaults are shown in
Table 3-1. If you are setting up the Switch for
management, we suggest that you log on first
as admin.
Table 3-1
Default Users
User Name Default
Password
Access Level
monitor
monitor
monitor — this user can view, but not
change all manageable parameters
manager
manager
manager — this user can access and
change the operational parameters
but not special/security features
security
security
security — this user can access and
change all manageable parameters
admin
(no password) security — this user can access and
change all manageable parameters
Figure 3-2
Logon screen
3-7
3-8
CHAPTER 3: SETTING UP FOR MANAGEMENT
After Logging On
When you have successfully logged on to the
Switch, the Main Menu screen is displayed as shown
in Figure 3-3. From here, you can select the options
needed to manage the unit. Refer to the screen
map on page 4-1.
If you have installed an ATM OC-3c Module into the
Switch, the Main Menu screen contains an ATM
CONFIGURATION option. Refer to the “SuperStack II
Switch ATM OC-3c Module User Guide” for more
information.
Access to options depends on the access level you
have been assigned. Access rights to the VT100
screens for the Switch are listed in Appendix B.
If you are a user with security access level, and are
using the management facility for the first time, we
suggest that you:
■
Assign a new password for your user, using the
Edit User screen, as described in “Editing User
Details” on page 4-5.
■
Log on as each of the other default users, and
change their passwords using the Edit User
screen.
■
Create any new users, in addition to the default
ones. To do this, you assign each user a name,
password and security level, as described in “Creating a New User” on page 4-3.
Figure 3-3
Main Menu screen
Setting Up the Switch for Management
3-9
Switch Management Setup
The Management Setup screen allows you to configure IP, IPX and SLIP parameters for the Switch.
This screen also allows you to display screens for
setting up the console port and traps.
To access the Setup screen, from the Main Menu
screen, select the MANAGEMENT SETUP option. The
Setup screen appears as shown in Figure 3-4.
If you change some of the following parameters,
the Switch must be reset for the change to take
effect. Reset the Switch by selecting OK and pressing the Reset button on the rear of the unit. Refer
to “Unit Overview — Rear” on page 1-12.
The screen shows the following:
MAC Address This read-only field shows the MAC
address of the Switch unit, which is required for
management.
Power On Self Test Type Normal / Extended This
field allows you to determine the type of self-test
that the Switch carries out when it is powered-up. If
the field is set to Normal, the Switch performs a
Fast Boot — a basic confidence check lasting
approximately 13 seconds. When the Switch performs a Fast Boot, it carries out the following tests:
■
Checksum test of boot and system areas of Flash
memory
■
System memory tests
■
MAC address verification test
■
System timer test
Figure 3-4
Management Setup screen
■
CAM (Contents Addressable Memory) tests
■
Console port tests
■
Internal packet forwarding tests
■
ASIC (Application Specific Integrated Circuit) tests
■
ASIC memory tests
■
Switch–Plug-in Module interface test
■
Plug-in Module packet forwarding tests
■
Plug-in Module ASIC tests
■
Plug-in Module ASIC memory tests
If the field is set to Extended, the Switch performs
an Extended test which may take up to 70 seconds
to complete. When the Switch performs an
Extended test, it carries out the Fast Boot tests and
more extensive tests on system memeory and ASIC
memory. The default setting for the field is Normal.
3-10
CHAPTER 3: SETTING UP FOR MANAGEMENT
If you suspect that there is a problem with the
Switch that has not been detected by the Normal
tests, set this field to Extended and reset the Switch
(refer to “Resetting the Switch” on page 4-27).
If you set the Switch to perform an Extended test,
the Switch must be disconnected from the rest of
your network when it is powered-up. The Switch
fails an Extended test if it receives any network traffic during the test.
Device IP Address If you are using IP, a unique IP
address must be specified in this field. If you do not
know the IP address of the Switch, consult your network administrator. You must reset the Switch after
changing this parameter.
Device SubNet Mask If you are using IP, enter a
suitable network mask. For a Class B IP address,
255.255.0.0 is suitable. For more information, contact your network administrator. You must reset the
Switch after changing this parameter.
Default Router If a default router exists on your
network, enter the IP address of the router. You
must reset the Switch after changing this parameter.
BOOTP Select Enabled / Disabled If BOOTP is
enabled and you have a BOOTP server on your network, an IP address is automatically mapped to the
Switch when it is first powered up. In addition to
mapping an IP address, BOOTP can also assign the
subnet mask and default router. Using a BOOTP
server avoids having to configure devices individually.
SLIP Address If you are using SLIP, enter an address
that has a network part different to the network
address of the Switch. For more information, contact your network administrator. You must reset the
Switch after changing this parameter.
SLIP SubNet Mask Enter a suitable SubNet Mask.
For a Class B address, 255.255.0.0 is suitable. For
more information, contact your network administrator. You must reset the Switch after changing this
parameter.
There are four entries under the following four
fields; one for each data link layer protocol that can
be used by IPX:
IPX Network This read-only field shows the address
of the network for this protocol. This address is
learned automatically from the local IPX router or
NetWare File Server, and you do not need to change
it.
Node This read-only field shows the node address
of the Switch which is learned automatically.
Status Enabled / Disabled If this field is set to
Enabled, you have access to the medium-access protocol. Set this field to Disabled if you wish to prevent access for security reasons.
Data Link Protocol This read-only field shows the
name of the IPX data link layer protocol.
Setting Up the Switch for Management
SETUP TRAPS Select this button to display the
setup screen for trap parameters. Trap setup is
described in “Setting Up Traps” on page 4-24.
CONSOLE PORT Select this button to display the
setup screen for console port parameters. Console
port setup is described in “Setting Up the Console
Port” on page 4-25.
3-11
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CHAPTER 3: SETTING UP FOR MANAGEMENT
Logging Off
If you have finished using the VT100 management
interface, select the LOGOFF option from the
bottom of the Main Menu screen. If you accessed
the VT100 management interface using a Telnet session or modem connection, the connection is
closed automatically.
Auto Logout
There is a built-in security timeout on the VT100
interface. If you do not press any keys for 3 minutes, the management facility warns you that the
inactivity timer is about to expire. If you do not
press a key within 10 seconds, the timer expires and
the screen is locked; any displayed statistics continue
to be updated. When you next press any key, the
display changes to the Auto Logout screen.
The Auto Logout screen (shown in Figure 3-5)
requests you to enter your password again. If the
password is correctly entered, the screen that was
active when the timer expired is displayed. If you
make a mistake entering your password, you are
returned to the Logon screen.
Figure 3-5
Auto Logout screen
4
MANAGING THE SWITCH 1000
Chapters 4, 5 and 6 describe all management facilities
for the Switch 1000. While following steps in these
chapters, you may find the screen map below useful:
Figure 4-1
Screen map
If an ATM OC-3c Module is installed in the Switch,
extra screens are available. Refer to the
“SuperStack® II Switch ATM OC-3c Module User
Guide” for more information.
4-2
CHAPTER 4: M ANAGING THE SWITCH 1000
Setting Up Users
From the Main Menu, select USER ACCESS LEVELS.
The User Access Levels screen appears as shown in
Figure 4-2.
From this screen you can access:
■
LOCAL SECURITY screen — This allows you to
set up access levels for users on the Switch.
■
CREATE USER screen — This allows you to
create up to 10 users in addition to the default
users set up on the Switch.
■
DELETE USERS screen — This allows you to
delete users from the Switch. The default users
cannot be deleted.
■
EDIT USER screen — This allows you to change
your own password and community string. You
cannot change details for other users.
Figure 4-2
User Access Levels screen
Creating a New User
4-3
Creating a New User
These steps assume the User Access Levels screen is
displayed.
1 Select the CREATE USER option. The Create User
screen is displayed, as shown in Figure 4-3.
2 Fill in the fields and assign an access level for the
new user.
3 When the form is complete, select OK.
The Create User screen shows the following fields:
Figure 4-3
User Name Type in the name of this new user. The
name can consist of up to 10 characters and is
case-sensitive.
Password Type in the password for this new user.
The password can consist of up to 10 characters
and is case-sensitive. For security reasons, the password is not displayed on screen.
Access Level Assign an access level for this new
user, as follows:
■
monitor — access to view, but not change, a
subset of the manageable parameters of the
Switch
■
secure monitor — as monitor
■
manager — access to all the manageable parameters of the Switch, except security features
Create User screen
■
specialist — as manager
■
security — access to all manageable parameters
of the Switch
Community String By default, a community string
identical to the user name is generated. You can
change this to any text string of 32 characters or
less. The community string is only needed for SNMP
access. If you are using a remote SNMP Network
Manager, the community string specified in the Network Manager’s database must be the same as that
for the device.
If you enter a community string that is greater than
32 characters, it is truncated to 32 characters.
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CHAPTER 4: M ANAGING THE SWITCH 1000
Deleting a User
These steps assume the User Access Levels screen is
displayed.
1 Select the DELETE USERS option. The Delete Users
screen is displayed, as shown in Figure 4-4.
2 Use the spacebar to highlight the user that you
want to delete. Note that you cannot delete default
users or the current user (that is, yourself).
3 Select DELETE USERS.
Figure 4-4
Delete Users screen
Editing User Details
Editing User Details
These steps assume the User Access Levels screen is
displayed.
1 Select the EDIT USER option. The Edit User screen is
displayed, as shown in Figure 4-5.
2 Fill in the fields as required.
3 When you have completed the changes, select OK.
The Edit User screen shows the following fields:
User Name This read-only field shows the name of
the user. This field cannot be changed; if you need
to change the user name, you must delete this user
and create a new one.
Old Password To change the user’s password, enter
the current password in this field.
New Password This field allows you to enter a new
password for the user.
Confirm Password This field allows you to
re-enter the new password.
Community String This field allows you to enter a
community string for the user.
If you forget your password while logged out of
the Switch VT100 interface, contact your local technical support representative who will advise on your
next course of action.
Figure 4-5
Edit User screen
4-5
4-6
CHAPTER 4: M ANAGING THE SWITCH 1000
Assigning Local Security
The Local Security screen shows a matrix of options
for access method (Console Port, Remote Telnet,
Community-SNMP) and access level.
These steps assume the User Access Levels screen is
displayed.
1 Select the LOCAL SECURITY option. The Local Secu-
rity screen is displayed, as shown in Figure 4-6.
2 Fill in the fields as required.
3 When you have filled in the form, select OK.
Access options are:
Console Port Enabled / Disabled To prevent access
to the management facilities via the console port,
disable access to the facility for each access level.
Console port access for Security is enabled and
cannot be changed. This prevents accidental disabling of all access levels from management.
Remote Telnet Enabled / Disabled Telnet is an insecure protocol. You may want to disable all access
to the management facilities via Telnet if there is
important or sensitive data on your network.
Community-SNMP Enabled / Disabled The Switch
can be managed via SNMP using a remote Network
Manager. Community-SNMP does have some
simple security features, but it is an insecure protocol. You may want to disable all access to the management facilities if there is important or sensitive
data on your network.
Figure 4-6
Local Security screen
Choosing a Switch Management Level
4-7
Choosing a Switch Management Level
The Switch Management screen allows you to:
■
Choose between managing a port, the unit, or a
VLAN
■
Display screens for setting up the Switch
■
Display a screen for managing the Switch Database
■
Display screens for managing resilient links
■
Display screens for managing STP
■
Display screens showing statistics
Figure 4-7
Switch Management screen for Port level (3C16900A)
Figure 4-8
Switch Management screen for Unit level
From the Main Menu, select SWITCH MANAGEMENT. The Switch Management screen is displayed,
as shown in Figure 4-7.
Management Level Port / Unit / VLAN If you
choose Port, the screen is displayed similar to
Figure 4-7, and all options at the foot of the screen
relate to an individual port. If you choose Unit, the
screen appears similar to Figure 4-8, and all options
relate to the Switch unit. If you choose VLAN, the
screen appears similar to Figure 4-9, and all options
relate to VLANs.
Port ID 1 / 2 / 3 / ... 24 / 25 / 26 (3C16900A)
1 / 2 / 3 / ... 12 / 13 / 14 (3C16901A) If you choose
to manage the Switch at port level, enter the particular port number into this field before selecting the
next screen. For 3C16900A, ports 1–24 are the
10BASE-T ports, port 25 is the Plug-in Module port
at the rear of the unit, and port 26 is the
100BASE-TX port.
For 3C16901A, ports 1–12 are the 10BASE-T ports,
port 13 is the Plug-in Module port at the rear of the
unit, and port 14 is the 100BASE-TX port.
4-8
CHAPTER 4: M ANAGING THE SWITCH 1000
STP Use this button to display screens for managing
Spanning Tree Protocol (STP) information for the
level of management you have chosen (port or
VLAN). Refer to “Spanning Tree Protocol” on page
5-12.
STP is not supported over Asynchronous Transfer
Mode (ATM). Consequently, if you specify that you
want to manage the Plug-in Module and the
Switch has an ATM OC-3c Module installed, the
STP button is not displayed.
SERVER Use this button to display the VLAN Server
screen, used for entering the IP address and community string of a VLAN server. For more information about VLAN servers, refer to “Virtual LANs
(VLANs)” on page 5-1.
STATS Use this button to display statistics screens for
the level of management you have chosen (port or
unit). Refer to Chapter 6.
SDB Use this button to display the Unit Database
View screen, which is used to manage the Switch
Database. Refer to “The Database View” on page
4-17.
RESILIENCE Use this button to display resilient link
management screens for the level of management
you have chosen (port or unit). Refer to “Setting
Up Resilient Links” on page 4-19.
You cannot set up resilient links if the Switch uses
Spanning Tree (STP). Consequently, the RESILIENCE
button is not displayed if STP is enabled.
Figure 4-9
Switch Management screen for VLAN level
SETUP Use this button to display setup screens for
the level of management you have chosen (port,
unit or VLAN). For information about the Port
Setup and Unit Setup screens, refer to “Setting Up
the Switch Ports” and “Setting Up the Switch Unit”
in this chapter. For information about the VLAN
Setup screen, refer to “Setting Up VLANs on the
Switch” on page 5-8.
Setting Up the Switch Unit
4-9
Setting Up the Switch Unit
With the Switch Management screen displayed,
choose the management level Unit, then select the
SETUP button.
The Unit Setup screen is displayed as shown in
Figure 4-10. The screen shows the following:
Unit Name This read-only field shows the type of
device.
sysName This field takes its name from the MIB II
System Group object. You can edit the first 30 characters of this field to make the name more meaningful. This name is displayed on the Main Banner
when you first access the VT100 screens, and is also
accessible to an SNMP Network Manager.
Figure 4-10
■
Store and Forward — Received packets are buffered in their entirety prior to forwarding. This
ensures that only good frames are passed to their
destination. The forwarding delay for this mode
varies between 64µs and 1.2ms, depending on
frame length. In this mode the latency, measured
as the time between receiving the last bit of the
frame and transmitting the first bit, is 8µs.
■
Intelligent — The Switch monitors the amount
of error traffic on the network and changes the
forwarding mode accordingly. If the Switch
detects less than 18 errors a second, it operates
in Fast Forward mode. If the Switch detects
more than 18 errors a second, it operates in
Store and Forward mode until the number of
errors returns to zero.
Forwarding Mode Fast Forward / Fragment Free /
Store and Forward / Intelligent This field allows you
to set the forwarding mode for the Switch:
■
■
Fast Forward — Frames are forwarded as soon
as the destination address is received and verified.
The forwarding delay, or latency, for all frames in
this mode is just 40µs but with the lack of checking time, error frames are propagated onto the
network.
Fragment Free — A minimum of 512 bits of the
received frame is buffered prior to the frame
being forwarded. This ensures that collision fragments are not propagated through the network.
The forwarding delay, or latency, for all frames in
this mode is 64µs.
Unit Setup screen (3C16900A)
Intelligent Forwarding Fast Forward / Store and
Forward This read-only field shows the forwarding
state if the Forwarding Mode is set to Intelligent.
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CHAPTER 4: M ANAGING THE SWITCH 1000
PACE Enable / Disable This field allows you to
enable or disable PACE (Priority Access Control
Enabled) for all ports on the Switch. PACE allows
multimedia traffic to be carried over standard Ethernet and Fast Ethernet LANs by providing two features:
■
■
Implicit Class of Service — When multimedia traffic is transmitted, it is given a higher priority
than other data and is therefore forwarded ahead
of other data when it arrives at the Switch. The
Implicit Class of Service feature minimizes latency
through the Switch and protects the quality of
multimedia traffic.
Interactive Access — When two-way multimedia
traffic passes over an Ethernet network, interference can occur because access to the bandwidth
is unequally allocated to traffic in one direction.
The Interactive Access feature allocates the available bandwidth equally in both directions, therefore increasing the quality of the traffic.
Interactive Access should only be enabled on ports
that connect to a single endstation, switch, bridge
or router. You should disable Interactive Access on
a port if it is connected to a repeater. Also, Interactive Access should only be enabled at one end of
the link.
For more information about disabling Interactive
Access for a port, refer to “Setting Up the Switch
Ports” on page 4-12.
VLAN Configuration Mode Port / AutoSelect This
field allows you to specify how ports on the Switch
are placed in VLANs:
■
Port — The ports use Port VLAN Mode, which
means that they are manually placed in the
required VLAN. This is the default mode.
■
AutoSelect — The ports use AutoSelect VLAN
Mode, which means that they are automatically
placed in the required VLAN by referring to a
VLAN Server database in 3Com’s Transcend®
Enterprise Manager software.
For more information, refer to “Using AutoSelect
VLAN Mode” on page 5-3.
Bridging Mode Forward To All / Forward To Backbone This field allows you to set the bridging mode,
which controls how packets with unknown
addresses are processed:
■
Forward To All — The Switch forwards packets
with an unknown address to all ports in the same
VLAN as the source port. This setting should
only be used if your network has less than 500
MAC addresses.
■
Forward To Backbone — The Switch forwards
packets with an unknown address to the backbone port defined for the VLAN of the source
port. This is the default setting.
For more information about VLANs and backbone
ports, refer to “Virtual LANs (VLANs)” on page 5-1.
Setting Up the Switch Unit
SDB Ageing Time This field allows you to specify
the ageing time (hours:minutes) for all non-permanent entries in the Switch Database of the unit.
You can set an ageing time in the range 0 minutes
to 277 hours, with a default of 30 minutes. If you
enter 0:00, ageing is turned off. For more information about ageing times, refer to “Setting Up the
Switch Database (SDB)” on page 4-16.
Spanning Tree Enable / Disable This field allows
you to enable or disable the Spanning Tree Protocol
(STP) on the Switch. For more information about
STP, refer to “Spanning Tree Protocol” on page
5-12.
Duplex Mode Half Duplex / Full Duplex on 100M
Ports / Full Duplex on all Ports This field allows you
to set the duplex mode of ports that have Unit
Default specified in the Duplex Mode field of the
Port Setup screen. The default setting is Half Duplex.
For more information about Duplex Mode, refer to
“Setting Up the Switch Ports” on page 4-12.
Backbone Port 1 / 2 / 3 / ... 24 / 25 / 26
(3C16900A) 1 / 2 / 3 /...12 / 13 / 14 (3C16901A)
If the Bridging Mode field is set to Forward to Backbone, and all the ports on the Switch belong to
VLAN 1 and use Port VLAN Mode, then this field
allows you to specify a backbone port for the
Switch. In all other situations, the field is not displayed.
On a new or initialized Switch, all ports belong to
VLAN 1 and use Port VLAN Mode.
4-11
For more information about VLANs, refer to “Virtual LANs (VLANs)” on page 5-1. For more information about backbone ports and their role in VLAN
functionality, refer to “Setting Up VLANs on the
Switch” on page 5-8.
Default RMON Host/Matrix Enable / Disable This
field allows you to enable (start) Hosts and Matrix
RMON sessions on the Default VLAN, or disable
(stop) existing sessions if they are no longer
required. The default setting for this field is Disable.
For more information about RMON sessions, refer to
“RMON” on page 5-22.
Plug-in Module Type This read-only field displays
the type of Plug-in Module fitted to the rear of the
unit, or displays Not Fitted.
Transceiver Module Type This read-only field
shows the type of Transceiver Module fitted to the
rear of the unit, or displays Not Fitted.
Power Supply Internal / External This read-only
field displays External if the Switch is receiving
power from a Redundant Power System. In all
other cases, this field displays Internal.
4-12
CHAPTER 4: M ANAGING THE SWITCH 1000
Setting Up the Switch Ports
With the Switch Management screen displayed,
choose the management level Port. Choose the
appropriate port, then select the SETUP button.
The Port Setup screen is displayed as shown in
Figure 4-11.
If the port is an ATM OC-3c Module port, the ATM
Port Setup screen is displayed. For more information, refer to the “SuperStack II Switch ATM OC-3c
Module User Guide”.
Figure 4-11
Port Setup screen (10BASE-T port)
The screen shows the following:
Port ID This read-only field shows the ID of the port
you have chosen to set up.
Media Type This read-only field shows the media
type of the link connected to this port.
Port Speed This read-only field shows the speed
and duplex mode of the link. HD indicates half
duplex, FD indicates full duplex.
Port State Enable / Disable This field allows you to
enable or disable the port. To prevent unauthorized
access, we recommend that you disable any unused
ports.
Link State Present / Not Available This read-only
field shows the state of the link:
■
Present — The port is operating normally
■
Not Available — The link has been lost
Lost Links This read-only field shows the number of
times the link has been lost since the Switch was
last reset. If the number in this field is not zero, you
should check your cables and replace any that may
be damaged.
If the port is directly connected to an endstation,
the Lost Links counter increments each time the
endstation goes through a power-off/on cycle.
Intelligent Flow Management Enable / Disable
This field allows you to enable or disable Intelligent
Flow Management (IFM). IFM minimizes packet loss
which can occur with conventional switches.
IFM should be disabled if the port is connected to a
repeated segment where the traffic is mainly local
to that segment. Refer to “Server Connections” in
Chapter 1.
Setting Up the Switch Ports
IFM is not available on a port which has full duplex
enabled:
■
If the Duplex Mode field in this screen is set to
Full Duplex, the Intelligent Flow Management
field is not displayed
■
In all other cases where the port has full duplex
enabled, IFM has no effect
Security Enable / Disable When Security is enabled,
the port enters single address learning mode. The
Switch removes all addresses currently stored in the
Switch Database against the port. The Switch then
learns the source address from the first packet it
receives on the port since Security was enabled.
Once the first address is learnt, no other endstation
is permitted to access the network through the port.
If an endstation with a different address attempts to
transmit packets onto the network through the
port, the port is automatically disabled and a trap is
generated. The port remains disabled until it is
enabled from the Port Setup screen or via SNMP
management.
A more comprehensive set of security features is
available through SNMP network management.
Security is not available on backbone ports. If the
port has been defined as a backbone port, the
Security field is not displayed.
4-13
Disable Interactive Access Yes / No This field
allows you to disable the Interactive Access feature
of PACE (Priority Access Control Enabled) on the
current port. You should disable Interactive Access
on a port if:
■
The port is connected to a repeater
■
The port is connected to a device with Interactive Access enabled
For more information about the Interactive Access
feature, refer to “Setting Up the Switch Unit” on
page 4-9.
VLT Mode Enable / Disable This field allows you to
specify whether the port is a VLT (Virtual LAN Trunk)
port. A Virtual LAN Trunk (or VLT) is a
Switch-to-Switch link which carries traffic for all the
VLANs on each Switch. To create a VLT, the ports on
both ends of the link must be VLT ports. For more
information about VLTs, refer to “VLANs and the
Switch” on page 5-3.
If the port uses AutoSelect VLAN Mode (refer to
the VLAN Configuration Mode field), you cannot
specify that the port is a VLT port.
4-14
CHAPTER 4: M ANAGING THE SWITCH 1000
Duplex Mode Half Duplex / Full Duplex / Unit
Default This field allows you to specify the duplex
mode of the port:
■
Full Duplex — Full duplex allows frames to be
transmitted and received simultaneously and, in
effect, doubles the potential throughput of a link.
In addition, full duplex also supports
100BASE-FX cable runs of up to 2km. You should
only enable full duplex on a point to point link
between the Switch and another device with full
duplex support.
Full duplex is not supported on the Transceiver
Module port.
■
Half Duplex — You should use half duplex if the
port connects to a shared Ethernet or Fast Ethernet LAN segment, or if the device at the other
end of a point-to-point link does not support full
duplex.
■
Unit Default — The duplex mode of the port is
defined by the Duplex Mode field in the Unit
Setup screen. This is the default setting.
VLAN Configuration Mode Port / AutoSelect /
Unit Default This field allows you to specify how the
port is placed in a VLAN:
■
Port — The port uses Port VLAN Mode, which
means that the port is manually placed in the
required VLAN.
■
AutoSelect — The port uses AutoSelect VLAN
Mode, which means that the port is automatically
placed in the required VLAN by referring to a
VLAN Server database in 3Com’s Transcend Enterprise Manager software.
■
Unit Default — The port uses Port VLAN Mode or
AutoSelect VLAN Mode depending on the contents of the VLAN Configuration Mode field in
the Unit Setup screen. This is the default setting.
For more information, refer to “Using AutoSelect
VLAN Mode” on page 5-3.
Broadcast Storm Control The Switch automatically creates an alarm on each of its ports to monitor the level of broadcast traffic on each port. The
Broadcast Storm Control fields allow you to specify
thresholds for the level of broadcast traffic on a
port, and specify an action to take place if the
threshold is exceeded.
Rising Threshold% This field allows you to specify
the percentage of broadcast traffic on the current
port which triggers the alarm for the port. The
default is 20%.
Falling Threshold% This field allows you to specify
the percentage of broadcast traffic on the current
port required to reset the alarm for the port. The
falling threshold prevents the rising threshold
events being triggered continuously. The default is
10%.
Setting Up the Switch Ports
Rising Action none / event / disable port /
disable port/notify / blip / blip port/notify Use this
field to specify the action for the alarm to take
when it reaches the rising threshold:
■
none — no action takes place
■
event — an SNMP trap is generated
■
disable port— the port is disabled
■
disable port/notify — the port is disabled and an
SNMP trap is generated
■
blip — the broadcast and multicast traffic on the
port is blocked for five seconds
■
blip port/notify — the broadcast and multicast
traffic on the port is blocked for five seconds,
and an SNMP trap is generated
If user defined is displayed in the Rising Action field,
an unrecognized action has been specified using a
MIB browser. You cannot select this option.
Falling Action none / event / enable /
event + enable Use this field to specify the action
for the alarm to take when it reaches the falling
threshold:
■
none — no action takes place
■
event — an SNMP trap is generated
■
enable — the port is enabled
■
event + enable — the port is enabled and an
SNMP trap is generated
4-15
If user defined is displayed in the Rising Action field,
an unrecognized action has been specified using a
MIB browser. You cannot select this option.
You should be aware of the following points when
using Broadcast Storm Control:
■
The Switch takes 5–7 seconds to recognize that a
broadcast storm is occurring.
■
Broadcast Storm Control calculates the average
broadcast bandwidth over the previous
20-second interval. The average is based on four
samples taken at 5-second intervals.
■
When the average value exceeds the rising
threshold value, the rising action is triggered.
The action is not triggered again until the average broadcast bandwidth falls below the falling
threshold level.
4-16
CHAPTER 4: M ANAGING THE SWITCH 1000
■
Setting Up the Switch Database (SDB)
The Switch maintains a database of device addresses
that it receives on its ports. It uses the information
in this database to decide whether a frame should
be forwarded or filtered. The database holds up to a
maximum of 500 entries; each entry consists of the
MAC address of the device and an identifier for the
port on which it was received.
There are three types of entries in the SDB:
■
Ageing entries — Initially, all entries in the database are ageing entries. Entries in the database
are removed (aged out) if, after a period of time
(ageing time), the device has not transmitted.
This prevents the database from becoming full
with obsolete entries by ensuring that when a
device is removed from the network, its entry is
deleted from the database. Ageing entries are
deleted from the database if the Switch is reset
or a power-off/on cycle occurs. For more information about setting an ageing time, refer to “Setting Up the Switch Unit” on page 4-9.
■
Non-ageing entries — If the ageing time is set
to 0:00, all ageing entries in the database are
defined as non-ageing entries. This means that
they do not age, but they are still deleted if the
Switch is reset or a power off/on cycle occurs. For
more information about setting an ageing time,
refer to “Setting Up the Switch Unit” on page
4-9.
■
Permanent entries — Permanent entries do
not age, and they are retained in the database if
the Switch is reset or a power-off/on cycle occurs.
If you have set up Traps for the Switch, notification
that the database is becoming full is provided by
two traps:
■
Database is 90% full
■
Database is 100% full
These traps indicate that the maximum number of
devices which can be connected to the Switch has
been reached. You cannot connect any more devices
to the Switch. Additional devices can, however, be
connected to the rest of the network.
Entries are added into the Switch Database in two
ways:
■
The Switch can learn entries. That is, the unit
updates the SDB with the source MAC address,
and the port identifier on which the source MAC
address is seen. Addresses are not learned on
the backbone port. Learning is affected by security (refer to the description for the Security field
on page 4-13).
The system administrator can enter and update
entries using a MIB browser, an SNMP Network
Manager or the Switch Database screen
described in the following sections.
Setting Up the Switch Database (SDB)
4-17
The Database View
The Unit Database View screen, as shown in
Figure 4-12, allows you to view and configure the
Switch Database.
To access the Unit Database View screen, display the
Switch Management screen, choose the management level Unit, then select the SDB button.
The Unit Database View screen shows the following:
Database Entries This read-only field shows the
number of entries currently in the SDB. The database holds a maximum of 500 addresses.
MAC Address If you highlight an entry in the listbox and press [Return], this field shows the MAC
address for the entry.
Port Number If you highlight an entry in the listbox, this field shows the port identifier for the entry.
Permanent Yes / No This field allows you to specify
that the current entry is permanent. Refer to the
previous section “Setting Up the Switch Database
(SDB)” for a description of permanent and ageing
entries.
You cannot specify that the current entry is permanent if the port uses AutoSelect VLAN Mode. For
more information about AutoSelect VLAN Mode,
refer to “Using AutoSelect VLAN Mode” on page
5-3.
Figure 4-12
Unit Database View screen
A listbox containing three fields:
Port The port ID for the entry.
MAC Address The MAC address for the port
currently stored in the database.
Permanent Yes / No Shows Yes if this entry is
permanent, or No if this entry is ageing or
non-ageing.
FIND This button lets you locate an entry in the
database. Refer to “Searching the Switch Database” on page 4-18.
REFRESH This button refreshes the database so that
it displays the latest information.
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CHAPTER 4: M ANAGING THE SWITCH 1000
INSERT This button lets you insert an entry into the
database. You cannot insert an entry for a port
which uses AutoSelect VLAN Mode.
DELETE This button allows you to delete entries
from the database. You cannot delete an entry if it
is associated with a port which uses AutoSelect
VLAN Mode.
Searching the Switch Database
You can search the switch database in two ways:
by MAC address or port number.
By MAC Address
To locate the port number against which a particular
MAC address is entered in the SDB:
1 In the MAC Address field, type in the MAC address
you are trying to locate.
2 Select FIND. The port ID is displayed in the Port
Number field and the entry in the listbox is highlighted with an asterisk (*).
Adding an Entry into the SDB
1 In the MAC Address field, type in the MAC address
of the device.
2 In the Port field, type in the port identifier for this
device.
3 Select whether the entry is permanent or not by
specifying Yes or No in the Permanent field.
4 Select INSERT.
Deleting an Entry from the SDB
1 In the listbox, highlight the entry you want to delete
and press [Return], or type the MAC address into
the MAC Address field.
2 Select DELETE.
Specifying that an Entry is Permanent
1 In the listbox, highlight the entry you want to make
permanent and press [Return], or type the MAC
address into the MAC Address field.
2 In the Permanent field, specify Yes.
By Port
To locate the MAC addresses entered against a particular port ID in the SDB:
1 Clear the MAC Address field by moving into the
field and pressing [Space].
2 In the Port Number field, enter the port ID for which
you want MAC addresses displayed.
3 Select FIND. The listbox will show entries in the
database for that port only.
3 Select INSERT.
Setting Up Resilient Links
Setting Up Resilient Links
You can configure a Switch to provide resilient links
to another device so that network disruption is minimized if a link fails. A resilient link pair consists of a
main link and a standby link. You define a resilient
link pair by specifying the main port and standby
port at one end of the pair.
When setting up resilient links, you should note the
following:
■
Up to 13 resilient link pairs can be configured on
a 24-port Switch 1000, and up to seven pairs can
be configured on a 12-port Switch 1000.
■
Resilient links cannot be set up if Spanning Tree
(STP) is enabled on the Switch.
■
Resilient Links can only be set up on fiber or
twisted pair links. The main and standby links in
the same pair, however, can use any combination of these media.
■
A resilient link pair can only be set up if:
■
The ports belong to the same VLAN.
■
The ports have an identical security setting.
■
Figure 4-13
If a main link has a higher bandwidth than its
standby link, traffic is automatically switched back to
the main link provided no loss of link is detected for
two minutes. Otherwise, you need to manually
switch traffic back to the main link.
Neither of the ports forms part of another
resilient link pair.
■
If the main port is VLT (Virtual LAN Trunk) port,
the standby port must also be a VLT port.
■
A resilient link pair must be defined at only one
end of the connection.
■
You cannot disable any port that is part of a resilient link pair.
Resilient link pair
Under normal network operating conditions, the
main link carries your data. The Receive Idle signal
of a fiber link or the Test Pulse on an Ethernet
twisted pair link is continually monitored by the
Switch. If a signal loss is detected, the Switch immediately enables the standby port so that it carries the
data. In addition, the main port is disabled.
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CHAPTER 4: M ANAGING THE SWITCH 1000
Configuring Resilient Links
With the Switch Management screen displayed,
choose the port that will be set up as the main
port in the resilient link pair, then select the RESILIENCE button.
The Port Resilience screen is displayed as shown in
Figure 4-14. This screen allows you to setup, edit
and delete resilient link pairs.
The screen shows the following:
Main Port ID This read-only field shows the ID of
the main port.
Media Type Twisted Pair / Fiber This read-only field
shows the media type connected to the main port.
Link State Available / Not Available / Not Present
This read-only field shows the connection state of
the main port:
■
Available — The port is operating normally
■
Not Available — The resilient link pair is disabled
■
Not Present — The port is not present in the current hardware
Standby Port ID This field shows the current
standby port ID and allows you to enter a new port
ID. The standby port must be in the same VLAN as
the main port.
Figure 4-14
Link State Available / Not Available / Not Present
This read-only field shows the connection state of
the standby port:
■
Available — The port is operating normally
■
Not Available — The resilient link pair is disabled
■
Not Present — The port is not present in the current hardware
Standby Links Available This listbox shows the
ports that you can configure as standby.
Pair State Active / Both Failed / Unknown /
Not Available This read-only field shows the current
operating state of the resilient link pair:
■
Media Type Twisted Pair / Fiber This read-only field
shows the standby port media type.
Port Resilience screen
Active — The resilient link pair is enabled and
operating normally with both main and standby
port capable of carrying traffic.
Setting Up Resilient Links
■
Both Failed — Although the resilient link is correctly configured, both links have failed. This
could be due to loose connections or cable damage.
■
Unknown — The network configuration has
changed and the resilient link pair no longer conforms to the rules.
■
Not Available — The resilient link pair is disabled.
Active Port Main / Standby If a main link does not
have a higher bandwidth than its standby link, traffic is not automatically switched back to the main
link when it recovers. Use this field to manually
switch traffic back to the main link.
Pair Enable Enabled / Disabled Use this field to
enable or disable the resilient link pair. Before you
disable a resilient link pair, you must remove
cabling from the ports to avoid creating loops in
your network configuration.
4-21
Creating a Resilient Link Pair
1 Ensure that the port nominated as the standby port
is not physically connected to the unit.
2 Ensure both ports have an identical port security
mode configuration and that they are members of
the same VLAN.
3 At the Switch Management screen, select the port
to be configured as the main port in the link. Select
the RESILIENCE button at the foot of the screen.
4 Select the standby port from the Standby Links
Available listbox or enter the port ID in the Standby
Port ID field.
5 Enable the pair in the Pair Enabled field. Select
APPLY.
6 Connect the cabling for the standby port.
Deleting a Resilient Link
To delete the resilient link set up on the port, select
the DELETE button at the foot of the screen. The
Port Resilience screen closes and the Switch Management screen is displayed.
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CHAPTER 4: M ANAGING THE SWITCH 1000
Viewing the Resilient Setup
With the Switch Management screen displayed,
choose the management level Unit and select the
RESILIENCE button.
The Unit Resilience Summary screen is displayed as
shown in Figure 4-15. This screen shows the current resilient link configuration for the unit, and
allows you to access the Port Resilience screen for
resilient link pairs.
The following information is displayed:
MAIN Port This read-only field displays the ID of
the port configured as the main port for the resilient
link pair.
STANDBY Port This read-only field displays the ID
of the port configured as the standby port for the
resilient link pair.
Pair State Active / Both Failed / Unknown / Not
Available This read-only field displays the current
state of the resilient link pair:
■
Active — The resilient link pair is enabled and
operating normally, with both main and standby
ports capable of carrying traffic.
■
Both Failed — Although the resilient link is correctly configured, both links have failed. Check
for any loose connections or cable damage.
■
Unknown — The network configuration has
changed and the resilient link pair no longer conforms to the rules.
■
Not Available — The resilient link pair is disabled.
Figure 4-15
Unit Resilience Summary screen
Active Port Main / Standby / Both Failed This
read-only field displays which port in the resilient
link pair is currently carrying traffic:
■
Main — The pair is operating in its normal state
with the main port carrying traffic.
■
Standby — The main port has failed and the
standby port is carrying the traffic. You should
rectify the fault as soon as possible. If a main
port has a higher bandwidth than the standby
port, traffic will be automatically switched back
provided no loss of link is detected for two minutes. Otherwise, set the Active Port setting in
the Port Resilience screen (described on page
4-20) to Main to manually switch traffic back.
■
Both Failed — Both ports of the resilient link pair
have failed. This could be due to loose connections or cable damage.
Setting Up Resilient Links
Pair Enable Enabled / Disabled This read-only field
displays whether the resilient link pair is currently
enabled or disabled. You enable or disable a resilient
link pair using the Port Resilience screen described in
“Configuring Resilient Links” on page 4-20.
OK This button allows you to access the Port Resilience screen for the current resilient link pair.
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CHAPTER 4: M ANAGING THE SWITCH 1000
Setting Up Traps
Traps are messages sent across the network to an
SNMP Network Manager. They alert the network
administrator to faults or changes at the Switch
device.
Your Network Manager may automatically set up
traps in the Switch Trap Table. Check the documentation accompanying your network management
software.
To access the Trap Setup screen, select the SETUP
TRAPS button from the Management Setup screen
(described in Chapter 3). The Trap Setup screen is
shown in Figure 4-16.
The screen shows the following:
IP or IPX Address This field allows you to enter the
IP or IPX address of the remote network management stations to which traps should be sent.
Community String This field allows you to enter
community strings for each remote Network Manager, allowing a very simple method of authentication between the Switch and the remote Network
Manager. The text string can be of 32 characters or
less. If you want a Network Manager to receive
traps generated by the device, you must enter the
community string of the Network Manager into the
trap table. The default community string is public.
Figure 4-16
Trap Setup screen
Throttle This field allows you to specify a throttle
delay value for each remote Network Manager.
Throttle delays are time periods placed between
packets to prevent a remote Network Manager
receiving too many traps at once. The unit of throttle is one thousandth of a second. The default
value is 100, which gives a delay of one tenth of a
second between each packet transmission.
Setting Up the Console Port
4-25
Setting Up the Console Port
From the Switch Management Setup screen,
described in Chapter 3, select the CONSOLE PORT
button. The Console Port Setup screen is displayed
as shown in Figure 4-17.
If you change any of the console port parameters,
you terminate any existing sessions using the console port when you exit the screen. Ensure that the
connected equipment’s console port parameters are
set to match the new configuration. This allows
you to continue to access the management facility
from the equipment after you change the console
port parameters.
The screen shows the following:
Connection Type Local / Remote This field allows
you to select the type of console port connection.
Select Remote if you want to manage the Switch
through a modem; DCD Control and DSR Control
are enabled. For all other cases, this field should be
set to Local.
DCD Control Enabled / Disabled This field is only
applicable to local connection types. It determines if
DCD is required for a local connection, and
whether the connection is closed if DCD is removed.
Refer to your terminal or modem user documentation if you are unsure of the correct setting.
Figure 4-17
Console Port Setup screen
DSR Control Enabled / Disabled This field is only
applicable to local connection types. It determines if
DSR is required for a local connection, and whether
the connection is closed if DSR is removed. Refer to
your terminal or modem user documentation if you
are unsure of the correct setting.
Flow Control XON/XOFF / NONE /
RTS-CTS Unidirectional / RTS-CTS Bidirectional
This field allows you to select the correct flow control option for your terminal or modem. Refer to
your terminal or modem documentation if you are
unsure of the correct setting.
Auto Config Enabled / Disabled The Switch can
auto configure the line speed (baud rate) to work
with your VT100 terminal. This field allows you to
specify whether auto-configuration is enabled.
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CHAPTER 4: M ANAGING THE SWITCH 1000
Speed 1200 / 2400 / 4800 / 9600 / 19200
This field allows you to select the correct line speed
(baud rate) for your terminal or modem. If you
have enabled auto-configuration, line speed is set
automatically.
Char Size 8 This read-only field shows the character
bit (data bit) size for the Switch. You should set your
terminal to the same value.
Parity NONE This read-only field shows the parity
setting for the Switch. You should configure your
terminal to the same setting.
Stop Bit 1 This read-only field shows the stop bit
setting for the Switch. You should configure your
terminal to the same setting.
Resetting the Switch
Resetting the Switch
If you suspect a problem with the Switch, you can
reset it.
1 From the Main Menu, select the RESET option.
The Reset screen is displayed as shown in
Figure 4-18.
2 Select OK.
Resetting the Switch in this way is similar to performing a power-off/on cycle. No setup information
is lost.
CAUTION: Performing a reset may cause some of
the data being transmitted at that moment to be
lost.
Figure 4-18
Reset screen
4-27
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CHAPTER 4: M ANAGING THE SWITCH 1000
Initializing the Switch
This screen allows you to perform a reset as
described in the previous section, and in addition,
returns non-volatile data stored on the unit to its
factory defaults (shown on page 1-14). Note that
the IP address is not cleared. You should only initialize the Switch if:
■
The configuration of the device no longer suits
your network
■
Other efforts to solve problems have not succeeded
Figure 4-19
To initialize the Switch:
■
1 From the Main Menu, select the INITIALIZE option.
The Initialize screen appears as shown in
Figure 4-19.
2 Select OK.
CAUTION: Use the Initialize option with great care.
The Switch configuration is cleared from memory
and cannot be recovered. After initialization, all
user information is lost and only default users are
available. All ports are set to their default values,
and are therefore enabled and available to all users.
When initializing the Switch, take particular note of
the following:
■
Network loops occur if you have set up resilient
links. Before initializing the Switch, ensure you
have disconnected the cabling for all your
standby links.
Initialize screen
VLT ports fail and you are not able to manage
the Switch if your management station communicates via the VLT. To avoid this:
a Remove the VLT configuration from both ends of
the VLT link before you initialize the Switch.
Note that the port furthest from your management station should have its VLT configuration
removed first.
b Reconfigure the VLT once the initialization is com-
plete.
Upgrading Software
4-29
Upgrading Software
When 3Com issues a new version of agent software
for the Switch, you can obtain it from the 3Com’s
information delivery systems described in “Online
Technical Services” on page F-1.
For upgrading the ATM OC-3c Module software,
refer to the “SuperStack II Switch ATM OC-3c
Module User Guide”.
You use the Software Upgrade screen to download
new software images. The protocol used for downloading software images is TFTP running over
UDP/IP or IPX.
CAUTION: Before attempting to download, note
the following:
■
The download only works over the network; it
does not work through the console port.
■
The download does not work over a Virtual LAN
Trunk (VLT) if you have a Boot software version
lower than version 2.0.
■
The download does not work over an ATM link.
If a software download over IPX fails, enter the
MAC or Ethernet address of your server into the
Switch Database via the Unit Database View screen
and then attempt the download again. Refer to
“Searching the Switch Database” on page 4-18.
Figure 4-20
Software Upgrade screen
To upgrade Switch management software:
1 From the Main Menu, select the SOFTWARE
UPGRADE option.
The Software Upgrade screen is displayed, as
shown in Figure 4-20.
2 From the Destination field, select Switch (this is the
default).
3 In the File Name field, enter the name of the file
that contains the software image to be downloaded to the Switch.
You must place the image file where it is accessible
to the TFTP load request. Check with your system
administrator if you are unsure of where to place
the image file.
4 In the Server Address field, enter the IP or IPX
address of the server containing the software image
to be loaded.
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CHAPTER 4: M ANAGING THE SWITCH 1000
5 Select OK.
During the download, the MGMT LED flashes green
and the screen is locked. When the download is
complete, the Switch is reset.
5
ADVANCED MANAGEMENT
Virtual LANs (VLANs)
Setting up Virtual Local Area Networks (VLANs) on
the Switch 1000 provides you with less timeconsuming network administration and more efficient network operation.
The following sections explain more about the concept of VLANs and explain how they can be implemented on the Switch 1000.
With VLANs, you can define your network according
to:
■
Departmental groups — For example, you can
have one VLAN for the Marketing department,
another for the Finance department, and
another for the Development department.
■
Hierarchical groups — For example, you can
have one VLAN for directors, another for managers, and another for general staff.
■
Usage Groups — For example, you can have
one VLAN for users of e-mail, and another for
users of multimedia.
What are VLANs?
A VLAN is defined as a group of location- and
topology-independent devices that communicate as
if they are on the same physical LAN. This means
that LAN segments are not restricted by the hardware which physically connects them; the segments
are defined by flexible user groups that you create
using software.
Benefits of VLANs
Implementing VLANs on your network has three
main advantages:
■
It eases the change and movement of devices on
IP networks
■
It helps to control broadcast traffic
■
It provides extra security
5-2
CHAPTER 5: ADVANCED MANAGEMENT
How VLANs Ease Change and Movement
With traditional IP networks, network administrators spend much of their time dealing with moves
and changes. If users move to a different IP subnet,
the IP addresses of each endstation must be
updated manually.
With a VLAN setup, if an endstation in VLAN 1 is
moved to a port in another part of the network,
you only need to specify that the new port is in
VLAN 1. This is something that can be done automatically if you have 3Com’s Transcend® Enterprise
Manager for Windows (v6.0 and above).
An Example
Figure 5-1 shows a network configured with three
VLANs — one for each of the departments who
access the network. The membership of VLAN 1 is
restricted to ports 1, 2, 3, 4 and 5 of Switch A;
membership of VLAN 2 is restricted to ports 4, 5,
6, 7 and 8 of Switch B while VLAN 3 spans both
Switches containing ports 6, 7, 8 of Switch A and 1,
2, 3 of Switch B.
In this simple example, each of these VLANs can be
seen as a broadcast domain — physical LAN segments that are not constrained by their physical
location.
How VLANs Control Broadcast Traffic
With traditional networks, congestion can be caused
by broadcast traffic which is directed to all network
devices whether they require it or not. VLANs
increase the efficiency of your network because
each VLAN can be set up to contain only those
devices which need to communicate with each
other.
Specific configurations using the Switch are shown
later in this chapter.
How VLANs Provide Extra Security
Devices within each VLAN can only communicate
with devices in the same VLAN. If a device in VLAN
1 needs to communicate with devices in VLAN 2,
the traffic must cross a router.
Figure 5-1
The concept of VLANs
Virtual LANs (VLANs)
VLANs and the Switch
The Switch 1000 supports VLANs which consist of
a set of switch ports. Each switch port can only
belong to one VLAN at a time, regardless of the
device to which it is attached.
Each Switch 1000 can support up to 16 VLANs.
However, you can have more than 16 VLANs in your
entire network by connecting the 16 Switch VLANs
to other VLANs using a router.
The Default VLAN and Moving Ports From the
Default VLAN
On each Switch, VLAN 1 is the Default VLAN of the
Switch; it has two properties:
■
It contains all the ports on a new or initialized
Switch
■
It is the only VLAN which allows an SNMP Network Manager to access the management agent
of the unit
By default, if a device is attached to a port in the
Default VLAN and you want to move the device into
another VLAN, you need to use the VLAN Setup
screen to place the port in that VLAN. For more
information about the VLAN Setup screen, refer to
“Setting Up VLANs on the Switch” on page 5-8.
Connecting VLANs to a Router
If the devices in a VLAN need to talk to devices in a
different VLAN, each VLAN requires a connection to
a router. Communication between VLANs can only
take place if they are all connected to the router. A
5-3
VLAN not connected to a router is an isolated
VLAN. You need one port for each VLAN connected
to the router.
Connecting Common VLANs Between Switch
Units
If you want to connect the VLANs on the Switch
1000 with the same VLANs on another Switch unit,
you can set up one link per VLAN. Alternatively,
you can set up a single link for all the VLANs by creating a Virtual LAN Trunk (VLT). A VLT is a
Switch-to-Switch link which carries traffic for all the
VLANs on each Switch. To set up a VLT, you configure the port at each end of the link.
VLTs can only be used for links between SuperStack® II Switch 1000, Switch 3000 and Desktop
Switch units. You cannot use VLTs for Switch–router
links.
If you specify that a port on one VLAN is a VLT port,
that port carries traffic for all the VLANs on the
Switch. If you then disable the VLT function on that
port, the port only carries traffic for the Default
VLAN (VLAN 1).
Using AutoSelect VLAN Mode
By default, all ports on the Switch use Port VLAN
Mode — where each switch port is manually
placed in the required VLAN. The Switch allows
some ports to use another mode, AutoSelect VLAN
Mode. In this mode, the ports are automatically
placed in the required VLAN by referring to a VLAN
Server database in 3Com’s Transcend Enterprise
Manager v6.0 for Windows.
5-4
CHAPTER 5: ADVANCED MANAGEMENT
AutoSelect VLAN Mode works as follows:
1 When an endstation is connected to a Switch or
moves from one port to another, the Switch learns
the MAC address of the endstation.
Figure 5-4
Figure 5-2
Switch learns the endstation’s MAC address
2 If the relevant port uses AutoSelect VLAN Mode, the
Switch interrogates the VLAN Server to determine
the VLAN membership of the endstation.
Figure 5-3
Switch interrogates the VLAN Server
AutoSelect VLAN Mode has an advantage over Port
VLAN Mode because once the VLAN Server database is set up correctly, you can move endstations to
other ports or other Switch units and the VLAN allocation of each endstation is automatically configured.
If you use AutoSelect VLAN Mode, note the following:
■
You need to specify an IP address and community
string for the VLAN Server.
■
You cannot use VLAN 15.
■
If a port has been configured as a backbone
port or as a VLT port, the port cannot use
AutoSelect VLAN Mode.
■
If a port has a permanent address stored against
it in the Switch Database, the port cannot use
AutoSelect VLAN Mode.
■
We recommend that you connect each switch
port to a single endstation. If you want to connect a port to multiple endstations, specify that
the port uses Port VLAN Mode.
3 Having obtained the VLAN membership for the end-
station, the Switch places the relevant port in the
specified VLAN.
Switch places the port in the VLAN
Virtual LANs (VLANs)
For information about how to set up VLANs using
AutoSelect VLAN Mode, refer to Chapter 5 on
page 5-11.
For more information about the VLAN Server database, refer to the documentation supplied with
3Com’s Transcend Enterprise Manager.
Using Non-routable Protocols
If you are running non-routable protocols on your
network (for example, DEC LAT or NET BIOS),
devices within one VLAN are not able to communicate with devices in a different VLAN.
Using Unique MAC Addresses
5-5
Example 1
The example shown in Figure 5-5 illustrates a
simple VLAN configuration with a single Switch
1000 whose ports are divided between two VLANs.
VLAN 1 is able to talk to VLAN 2 using the connection between each VLAN and the router.
To set up this configuration:
1 Use the VT100 screens or VLAN Server database to:
a Place ports 1–6 and 13–18 in VLAN 1.
b Place ports 7–12 and 19–24 in VLAN 2.
2 Connect a port in VLAN 1 to the router.
3 Connect a port in VLAN 2 to the router.
If you connect a server with multiple network adapters to the Switch, we recommend that you configure each network adapter with a unique MAC
address.
Extending VLANs into an ATM Network
If the Switch has an ATM OC-3c Module installed,
you can extend the VLANs you have defined in
your existing network into an ATM network. For
more information, refer to the “SuperStack II
Switch ATM OC-3c Module User Guide”.
VLAN Configurations
You can set up VLAN configurations more easily if
you use 3Com’s Transcend Enterprise Manager applications for all the management tasks.
Figure 5-5
VLAN configuration with a single Switch 1000 unit
5-6
CHAPTER 5: ADVANCED MANAGEMENT
Example 2
The example shown in Figure 5-6 illustrates two
VLANs spanning two Switch 1000 units. VLAN 1 is
able to talk to VLAN 2 using the connection
between each VLAN and the router. Ports within the
same VLAN but on different Switches communicate
using the VLT.
To set up this configuration:
1 Use the VT100 screens or VLAN Server database to:
a Place ports 1–6 and 13–18 of both Switch units
in VLAN 1.
b Place ports 7–12 and 19–24 of both Switch units
in VLAN 2.
2 Connect port 26 of the higher Switch to Server 1.
3 Connect port 26 of the lower Switch to Server 2.
4 Use the VT100 screens or VLAN Server database to:
a Place port 26 of the higher Switch in VLAN 2.
b Place port 26 of the lower Switch in VLAN 1.
5 Connect a port on the higher Switch to a port in
the lower Switch.
6 Use the VT100 screens to specify that the
Switch-to-Switch port on the higher Switch is a
backbone port and a VLT port.
7 Use the VT100 screens to specify that the
Switch-to-Switch port on the lower Switch is a VLT
port.
Figure 5-6
VLAN configuration with two Switch 1000 units
8 Connect a VLAN 1 port on the lower Switch to the
router.
9 Connect a VLAN 2 port on the lower Switch to the
router.
Virtual LANs (VLANs)
5-7
Example 3
The example shown in Figure 5-7 illustrates two
VLANs spanning three Switch 1000 units and a
basement Switch 3000 FX with a Plug-in Module.
Each Switch 1000 connects into the basement
Switch using a VLT. The attached router allows the
two VLANs to communicate with each other.
To set up this configuration:
1 Use the VT100 screens or VLAN Server database to:
a Place ports 1–6 and 13–18 of all the Switch 1000
units in VLAN 1.
b Place ports 7–12 and 19–24 of all the Switch
1000 units in VLAN 2.
2 Connect a port on each Switch 1000 to a port in
the Switch 3000 FX.
3 Use the VT100 screens to:
a Specify that each Switch 1000 port connected to
the Switch 3000 FX is a backbone port.
b Specify that each Switch 1000 port connected to
the Switch 3000 FX is a VLT port.
c Specify that each Switch 3000 FX port con-
Figure 5-7
VLAN configuration with a basement Switch 3000 FX
nected to a Switch 1000 is a VLT port.
4 Connect port 1 of the Switch 3000 FX to Server 1.
5 Connect port 2 of the Switch 3000 FX to Server 2.
6 Use the VT100 screens or VLAN Server database to:
a Place port 1 of the Switch 3000 FX in VLAN 1.
b Place port 2 of the Switch 3000 FX in VLAN 2.
7 Connect two spare ports on the Switch 3000 FX to
the router.
8 Use the VT100 screens or VLAN Server database to
specify that one Switch 3000 FX port connected to
the router is placed in VLAN 1, and the other is
placed in VLAN 2.
5-8
CHAPTER 5: ADVANCED MANAGEMENT
Setting Up VLANs on the Switch
The VLAN Setup screen allows you to:
■
Assign ports to VLANs, if those ports use Port
VLAN Mode
■
Define a backbone port for each VLAN
■
View VLAN setup information for the Switch
To access the VLAN Setup screen:
1 From the Main Menu, select SWITCH MANAGE-
MENT. The Switch Management screen is displayed.
2 In the Management Level field, choose VLAN.
Figure 5-8
VLAN Setup screen
3 Choose the SETUP button. The VLAN Setup screen is
displayed, as shown in Figure 5-8.
■
The screen shows the following:
A backbone port is used to connect each
VLAN to the backbone of your network.
Addresses received on the port are not stored
in the Switch Database. Frames with
unknown addresses received by the Switch
are forwarded to the port
A listbox containing three fields:
Port This field allows you to select the ID of the
port that you want to set up.
Type VLT / Bp / Standby / ATM / AutoSelect
This field displays information about the setup of
the port:
■
■
VLT — The port is a VLT port. A Virtual LAN
Trunk (or VLT) is a Switch-to-Switch link which
carries traffic for all the VLANs on each
Switch. For more information about VLTs in
general, refer to “VLANs and the Switch” on
page 5-3. To specify that a port is a VLT port,
refer to “Setting Up the Switch Ports” on
page 4-12.
Bp — The port is the backbone port for the
VLAN(s) specified in the VLAN Membership
field.
■
Standby — The port is the standby port of a
resilient link pair. The main port of the pair is
displayed in brackets. For more information
about resilient links, refer to “Setting Up Resilient Links” on page 4-19.
ATM — The port is an ATM OC-3c Module
port. For more information, refer to the
“SuperStack II Switch ATM OC-3c Module User
Guide”.
Virtual LANs (VLANs)
■
AutoSelect — The port uses AutoSelect VLAN
Mode. For more information about AutoSelect VLAN Mode, refer to “Using AutoSelect
VLAN Mode” on page 5-3. For information
about how to configure VLANs using AutoSelect VLAN Mode, refer to “Setting Up VLANs
Using AutoSelect VLAN Mode” on page 5-11.
VLAN Membership This field displays the ID of
the VLAN(s) to which the port belongs.
Port ID 1 / 2 / 3 / ... 24 / 25 / 26 (3C16900A)
1 / 2 / 3 /... 12 / 13 / 14 (3C16901A) This field displays the ID of the port currently selected in the listbox.
VLAN ID 1 / 2 / 3 / ... 16 If the port specified in the
Port ID field uses Port VLAN Mode, this field allows
you to enter the ID of the VLAN to which the port is
to be assigned. If the port uses AutoSelect VLAN
Mode, you cannot specify the VLAN ID. By default,
all ports use Port VLAN Mode and belong to the
Default VLAN (VLAN 1). This field is not displayed if
the port is a VLT port.
If you are using AutoSelect VLAN Mode, you cannot
use VLAN 15. Also, if you are using the Spanning
Tree Protocol, you cannot use VLAN 16. In these
cases, the relevant VLANs are used internally by the
Switch and are therefore not available.
5-9
Backbone Port Yes / No If the port specified in the
Port ID field uses Port VLAN Mode, this field allows
you to specify whether the port is a backbone port.
If the port uses AutoSelect VLAN Mode or is the
standby port of a resilient link pair, you cannot specify that it is a backbone port.
Each VLAN can have one backbone port. By default,
all ports belong to the Default VLAN (VLAN 1);
because of this, an unconfigured Switch unit can
only have one backbone port.
If you specify that an ATM OC-3c Module port is a
backbone port, the port becomes a backbone port
for all the VLANs on which it is active. It cannot be
the backbone port for one VLAN and a standard
port for another.
If you fit a Plug-in Module into a Switch with no
specified backbone ports, the Module automatically
becomes the backbone port for the Default VLAN
when you power up or initialize the Switch. If a
Switch has no Plug-in Module, but you fit a Transceiver Module, this becomes the backbone port for
the Default VLAN when you power up or initialize
the Switch.
APPLY This button applies any changes to the VLAN
database.
ATM LEC Setup If the port is an ATM OC-3c
Module port, this button allows you access the
VLAN LEC Setup screen for extending your VLANs
into an ATM network. For more information, refer
to the “SuperStack II Switch ATM OC-3c Module
User Guide”.
5-10
CHAPTER 5: ADVANCED MANAGEMENT
Assigning a Port to a VLAN When Using Port
VLAN Mode
1 In the Port ID field, enter the ID of the required
Specifying that a Port is a VLT Port
To specify that a port is a VLT port, refer to “Setting Up the Switch Ports” on page 4-12.
port.
2 In the VLAN ID field, enter the ID of the required
VLAN.
3 Select APPLY.
CAUTION: Initially, all Switch ports belong to the
Default VLAN (VLAN 1). This VLAN is the only one
that allows an SNMP Network Manager to access
the management agent of the unit. If you remove
all ports from VLAN 1, then an SNMP Network
Manager cannot manage the Switch.
Specifying a Backbone Port
1 In the Port ID field, type the ID of the required port.
2 In the VLAN ID field, type the ID of the required
VLAN.
3 In the Select Port Type field, select Backbone Port.
4 Select APPLY.
To create a VLT link, the ports on both ends of the
link must be VLT ports.
Virtual LANs (VLANs)
5-11
Setting Up VLANs Using AutoSelect VLAN Mode
To set up VLANs using AutoSelect VLAN Mode, you
need to:
■
Specify information about the VLAN Server
■
Specify that the Switch unit, or individual ports
on the unit, use AutoSelect VLAN Mode
Specifying Information About the VLAN Server
The VLAN Server screen allows you to specify information about the VLAN Server. To access the VLAN
Server screen:
1 From the Main Menu, select SWITCH MANAGE-
Figure 5-9
VLAN Server screen
MENT. The Switch Management screen is displayed.
2 In the Management Level field, choose VLAN.
3 Choose the SERVER button. The VLAN Server
screen is displayed, as shown in Figure 5-9.
The screen shows the following:
VLAN Server IP Address Enter the IP address of
your VLAN Server in this field.
Backup VLAN Server IP Address This field allows
you to enter the IP address of a backup VLAN
Server. A backup VLAN Server can be used to supply
VLAN allocations when the Switch cannot access the
main VLAN Server.
VLAN Server Community String This field allows
you to enter a community string for the VLAN
Server(s). The default community string is public.
Throttle 0...99999 This field allows you to specify
the time delay, in milliseconds, between the transmission of VLAN allocation requests to the Server.
The time delay is used to avoid placing an excessive
workload on the VLAN Server. The default setting
for this field is 50 milliseconds.
Poll Period This read-only field shows the time
interval, in seconds, between successive polls of the
VLAN Server. The Switch polls the VLAN Server
once every poll period to check for any changes.
Specifying AutoSelect VLAN Mode
To specify that the Switch uses AutoSelect VLAN
Mode, refer to “Setting Up the Switch Unit” on
page 4-9.
To specify that a port on the Switch uses
AutoSelect VLAN Mode, refer to “Setting Up the
Switch Ports” on page 4-12.
5-12
CHAPTER 5: ADVANCED MANAGEMENT
Spanning Tree Protocol
Using the Spanning Tree Protocol (STP) functionality
of your Switch makes your network more fault tolerant.
The following sections explain more about STP and
the STP features supported by the Switch.
STP is not currently supported over an Asynchronous
Transfer Mode (ATM) network. Therefore, if you
have an ATM OC-3c Module installed in your
Switch, it does not join the STP system.
What is STP?
STP is a part of the 802.1d bridge specification
defined by the IEEE Computer Society. To explain
STP more effectively, the Switch 1000 will be
defined as a bridge.
STP is a bridge-based system for providing fault tolerance on networks. STP allows you to implement
parallel paths for network traffic, and ensure that:
■
Redundant paths are disabled when the main
paths are operational
■
Redundant paths are enabled if the main paths
fail
As an example, Figure 5-10 shows a network containing three LAN segments separated by three
bridges. With this configuration, each segment can
communicate with the others using two paths. This
configuration creates loops which cause the net-
work to overload; however, STP allows you to have
this configuration because it detects duplicate paths
and immediately prevents, or blocks, one of them
from forwarding traffic.
Figure 5-11 shows the result of enabling STP on the
bridges in the configuration. The STP system has
decided that traffic from LAN segment 2 to LAN
segment 1 can only flow through Bridges C and A.
If the link through Bridge C fails, as shown in
Figure 5-12, the STP system reconfigures the network so that traffic from segment 2 flows through
Bridge B.
Spanning Tree Protocol
Figure 5-10
A network configuration that creates loops.
Figure 5-11
Traffic flowing through Bridges C and A
Figure 5-12
Traffic flowing through Bridge B
5-13
5-14
CHAPTER 5: ADVANCED MANAGEMENT
How STP Works
STP Initialization
Initially, the STP system requires the following before
it can configure the network:
■
■
Communication between all the bridges. This
communication is carried out using Bridge Protocol Data Units (BPDUs), which are transmitted in
packets with a known multicast address.
One bridge to start as a master or Root Bridge, a
central point from which the network is configured.
The Root Bridge is selected on the basis of it having
the lowest Bridge Identifier value. This is a combination of the unique MAC address of the bridge and a
priority component defined for the bridge.
The Root Bridge generates BPDUs on all ports at a
regular interval known as the Hello Time. All other
bridges in the network have a Root Port. This is the
port nearest to the Root Bridge, and it is used for
receiving the BPDUs initiated by the Root Bridge.
STP Stabilization
Once the network has stabilized, two rules apply to
the network:
1 Each network segment has one Designated Bridge
Port. All traffic destined to pass in the direction of
or through the Root Bridge flows through this port.
The Designated Bridge Port is the port which has
the lowest Root Path Cost for the segment.
The Root Path Cost consists of the path cost of the
Root Port of the bridge, plus the path costs across
all the Root Ports back to the Root Bridge.
Table 5-1 shows the default path costs for the
Switch 1000.
Table 5-1
Default path costs
Port Type
Duplex
Cost
100BASE-TX / 100BASE-FX (VLT)
Full
5
Half
12
Full
24
Half
25
Full
150
Half
300
Full
650
Half
700
10BASE-T (VLT)
100BASE-TX / 100BASE-FX
10BASE-T
2 After all the bridges on the network have deter-
mined the configuration of their ports, each bridge
only forwards traffic between the Root Port and the
ports that are the Designated Bridge Ports for each
network segment. All other ports are blocked,
which means that they are prevented from forwarding traffic.
STP Reconfiguration
In the event of a network failure, such as a segment
going down, the STP system reconfigures the network to cater for the changes. If the topology of
your network changes, the first bridge to detect
the change sends out an SNMP trap.
Spanning Tree Protocol
An Example
Figure 5-13 illustrates part of a network. All bridges
have a path cost value assigned to each port, identified by PC=xxx (where xxx is the value).
Bridge A is selected by STP as the Root Bridge,
because it has the lowest Bridge Identifier. The Designated Bridge Port for LAN A is port 1 on Bridge A.
Each of the other four bridges have a Root Port (the
port closest to the Root Bridge). Bridge X and Bridge
B can offer the same path cost to LAN B. In this
case Bridge B's port is chosen as the Designated
Bridge Port, because it has the lowest Bridge Identifier. Bridge C's port is chosen as the Designated
Bridge Port for LAN C because it offers the lowest
Root Path Cost (the route through Bridge C and B
costs 200, the route through Bridge Y and B would
cost 300). You can set the path cost of a bridge
port to influence the configuration of a network
with a duplicate path.
Once the network topology is stable, all the bridges
listen for special Hello BPDUs transmitted from the
Root Bridge at regular intervals. If the STP Max Age
time expires (refer to “Configuring the STP Parameters of VLANs” on page 5-18) before receiving a
Hello BPDU, it assumes that the Root Bridge, or a
link between itself and the Root Bridge, has gone
down. It then initiates a reconfiguration of the network topology.
You can adjust timers to determine how quickly a
network reconfigures and therefore how rapidly the
network recovers from a path failure (refer to “Configuring the STP Parameters of VLANs” on page
5-18).
Figure 5-13
Port costs in a network
5-15
5-16
CHAPTER 5: ADVANCED MANAGEMENT
STP Configurations
Figure 5-14 shows two possible STP configurations
using SuperStack II Switch units:
■
Configuration 1 — Redundancy for Backbone Link
In this configuration, a Switch 1000 and Switch
3000 TX both have STP enabled and are connected by two Fast Ethernet links. STP discovers a
duplicate path and disables one of the links. If
the enabled link breaks, the disabled link
becomes re-enabled, therefore maintaining connectivity.
■
Configuration 2 — Redundancy through
Meshed Backbone
In this configuration, four Switch 3000 TX units
are connected such that there are multiple paths
between each one. STP discovers the duplicate
paths and disables two of the links. If an
enabled link breaks, one of the disabled links
becomes re-enabled, therefore maintaining connectivity.
Figure 5-14
STP configurations
Spanning Tree Protocol
Enabling STP on the Switch
To enable STP on your Switch:
1 From the VT100 Main Menu, select SWITCH MAN-
AGEMENT. The Switch Management screen is displayed.
2 In the Management Level field, choose Unit.
3 Choose the SETUP button. The Unit Setup screen is
displayed, as shown in Figure 5-15.
4 In the Spanning Tree field, specify Enable.
5 Choose OK.
You cannot enable STP if you have set up resilient
links on any of the Switch ports, or if you are using
VLAN 16.
CAUTION: If STP is enabled on your Switch 1000
and the Switch is connected to another Switch
1000, a Desktop Switch, or a repeater, the Bridging
Mode of the Switch must be set to Forward to All.
If the Bridging Mode of the Switch 1000 is set to
Forward to Backbone, link losses may occur on
your network. For more information about setting
the Bridging Mode for your Switch, refer to “Setting
Up the Switch Unit” on page 4-9.
Figure 5-15
Unit Setup screen
5-17
5-18
CHAPTER 5: ADVANCED MANAGEMENT
Configuring STP on the Switch
CAUTION: You should not configure any STP
parameters unless you have considerable knowledge and experience with STP.
Configuring the STP Parameters of VLANs
The Switch has a completely separate STP system for
each VLAN that you have specified. Each VLAN has
its own Root Bridge, Root Ports and BPDUs.
The VLAN STP screen allows you to set up and
manage an STP system for each VLAN on the
Switch. To access the VLAN STP screen:
1 From the Main Menu, select SWITCH MANAGE-
MENT. The Switch Management screen is displayed.
2 In the Management Level field, choose VLAN.
3 Choose the STP button. The VLAN STP screen is dis-
played, as shown in Figure 5-16.
The VLAN STP screen shows the following:
VLAN ID 1 / 2 / 3 / ... 15 This field allows you to
specify the VLAN to be configured.
If you are using STP, you cannot use VLAN 16. Also,
if you are using AutoSelect VLAN Mode, you cannot
use VLAN 15. In these cases, the relevant VLANs are
used internally by the Switch and are therefore not
available.
Topology Changes This read-only field shows the
number of network topology changes that have
occurred in the current VLAN.
Figure 5-16
VLAN STP screen
Max Age 6...40 This read-only field shows the
time (in seconds) that the Switch waits before trying
to re-configure the network. If the Switch has not
received a BPDU within the time specified in this
field, it will try to re-configure the network topology.
Designated Root This read-only field shows the
Bridge Identifier of the designated Root Bridge.
Hello Time 1...10 This read-only field shows the
time delay, in seconds, between the transmission of
BPDUs from the Switch.
Root Cost This read-only field shows the path cost
from the Switch to the Root Bridge.
Spanning Tree Protocol
Forward Delay 4...30 This read-only field shows
the time (in seconds) that the ports on the Switch
spend in the listening and learning states. For more
information about these states, refer to “Configuring the STP Parameters of Ports” on page 5-20.
Root Port This read-only field shows the Root Port
of the Switch.
Hold Time This read-only field shows the shortest
time interval (in seconds) allowed between the
transmission of BPDUs.
Time Since Topology Change This read-only field
shows the time interval since the last topology
change was detected.
Bridge Priority 0...65535 This field allows you to
specify the priority of the Switch. By changing the
priority of the Switch, you can make it more or less
likely to become the Root Bridge. The lower the
number, the more likely it is that the bridge will be
the Root Bridge. The default setting for this field is
65535.
Do not change the priority of the Switch unless
absolutely necessary.
Bridge Max Age 6...40 This field allows you to
specify the time (in seconds) that the Switch waits
before trying to re-configure the network when it is
the Root Bridge. If the Switch has not received a
BPDU within the time specified in this field, it will
try to re-configure the STP topology. The default setting for this field is 20 seconds.
5-19
The time must be greater than, or equal to, 2 x
(Hello Time + 1) and less than, or equal to,
2 x (Forward Delay – 1).
Bridge Hello Time 1...10 This field allows you to
specify the time delay, in seconds, between the
transmission of BPDUs from the Switch when it is
the Root Bridge. The default setting for this field is
2 seconds.
Bridge Forward Delay 4...30 This field allows you
to specify the time (in seconds) that the ports on
the Switch spend in the listening and learning states
when the Switch is the Root Bridge. The default setting is 15 seconds. For more information about
these states, refer to “Configuring the STP Parameters of Ports” on page 5-20.
APPLY This button applies any changes to the STP
system.
5-20
CHAPTER 5: ADVANCED MANAGEMENT
Configuring the STP Parameters of Ports
The Port STP screen allows you to set up and
manage the STP parameters of each port on the
Switch. To access the Port STP screen:
1 From the Main Menu, select SWITCH MANAGE-
MENT. The Switch Management screen is displayed.
2 In the Management Level field, choose Port.
3 In the Port ID field, enter the ID of the port to be
configured.
4 Choose the STP button. The Port STP screen is dis-
played, as shown in Figure 5-17.
Figure 5-17
Port STP screen
The screen shows the following:
■
Blocking — A port in this state does not forward
packets to prevent more than one active path
existing on the network. The port is included in
STP calculations, and BPDUs can be transmitted,
received and processed.
■
Learning — A port in this state is preparing to
forward packets, but has temporarily blocked to
prevent a loop. During the Learning state, the
Switch learns the addresses of all error-free packets. The port is included in STP calculations, and
BPDUs can be transmitted, received and processed.
■
Forwarding — A port in this state can forward
packets. BPDUs can also be received and processed.
Port ID 1 / 2 / 3 / ... 24 / 25 / 26 (3C16900A)
1 / 2 / 3 / ... 12 / 13 / 14 (3C16901A)
This read-only field shows the ID of the port to be
configured.
STP State Disabled / Listening / Blocking / Learning
/ Forwarding This read-only field shows the current
state of the port:
■
Disabled — A port in this state does not forward
packets, and does not participate in STP operation.
■
Listening — A port in this state is preparing to
forward packets, but has temporarily blocked to
prevent a loop. During the Listening state,
BPDUs are transmitted, received and processed.
Designated Port This read-only field shows the ID
of the Designated Bridge Port for the current port’s
segment.
Spanning Tree Protocol
5-21
Designated Cost This read-only field shows the
path cost from the Root Bridge to the Designated
Bridge Port for the current port’s segment.
Fast Start Enable / Disable This field allows you to
specify whether the port goes directly to the Forwarding state when a device is connected to it. Set
this field to Enable if the port is directly connected
to an endstation. The default setting for this field is
Disable.
Designated Bridge This read-only field shows the
Bridge Identifier of the Designated Bridge for the
current port’s segment.
CAUTION: If you set the Fast Start field to Enable
when the port is connected to multiple endstations,
loops may occur in your network.
Designated Root This read-only field shows the
Bridge Identifier of the Root Bridge.
Fwd Transitions This read-only field shows the
number of times that the current port has transitioned from the Learning state to the Forwarding
state.
Port Enable Enable / Disable This field allows you
to enable or disable the current port.
Priority 0...255 This field allows you to specify the
priority of the port. By changing the priority of the
port, you can make it more or less likely to become
the Root Port. The lower the number, the more
likely it is that the port will be the Root Port. The
default setting for this field is 128.
Path Cost 0...65535 This field allows you to specify
the path cost of the port.
The Switch automatically assigns the default path
costs shown in Table 5-1 on page 5-14. If you specify a new path cost in this field, this automatic
system is disabled, and you can only re-enable it by
initializing the Switch.
5-22
CHAPTER 5: ADVANCED MANAGEMENT
RMON
Using the RMON (Remote Monitoring) capabilities of
your Switch allows network administrators to
improve their efficiency and reduce the load on their
network.
The following sections explain more about the
RMON concept and the RMON features supported
by the Switch.
What is RMON?
RMON is the common abbreviation for the Remote
Monitoring MIB (Management Information Base), a
system defined by the IETF documents RFC 1271
and RFC 1757, which allows you to monitor LANs
remotely.
A typical RMON setup consists of two components:
■
The RMON probe — An intelligent,
remotely-controlled device or software agent
that continually collects statistics about a LAN
segment or VLAN, and transfers the information
to a management workstation on request or
when a pre-defined threshold is crossed.
■
The management workstation — Communicates with the RMON probe and collects the statistics from it. The workstation does not have to
be on the same network as the probe and can
manage the probe by in-band or out-of-band
connections.
You can only use the RMON features of the Switch
if you have an RMON management application,
such as the RMON application supplied with
3Com’s Transcend Enterprise Manager.
RMON
About the RMON Groups
The IETF define nine groups of Ethernet RMON statistics. This section describes these groups, and
details how they can be used.
Statistics
The Statistics group provides traffic and error statistics showing packets, bytes, broadcasts, multicasts
and errors on a LAN segment or VLAN.
Information from the Statistics group is used to
detect changes in traffic and error patterns in critical
areas of your network.
History
The History group provides historical views of network performance by taking periodic samples of
the counters supplied by the Statistics group. The
group features user-defined sample intervals and
bucket counters for complete customization of trend
analysis.
The group is useful for analysis of traffic patterns
and trends on a LAN segment or VLAN, and to
establish baseline information indicating normal
operating parameters.
5-23
Alarms
The Alarms group provides a versatile, general
mechanism for setting thresholds and sampling
intervals to generate events on any RMON variable.
Both rising and falling thresholds are supported, and
thresholds can be on the absolute value of a variable or its delta value. In addition, alarm thresholds
may be autocalibrated or set manually.
Alarms are used to inform you of a network performance problem and they can trigger automated
action responses through the Events group.
Hosts
The Hosts group specifies a table of traffic and
error statistics for each host on a LAN segment or
VLAN. Statistics include packets sent and received,
octets sent and received, as well as broadcasts, multicasts, and error packets sent.
The group supplies a simple discovery mechanism
listing all hosts that have transmitted. The next
group, Hosts Top N, requires implementation of the
Hosts group.
Hosts Top N
The Hosts Top N group extends the Hosts table by
providing sorted host statistics, such as the top 20
nodes sending packets or an ordered list of all
nodes according to the errors they sent over the last
24 hours.
5-24
CHAPTER 5: ADVANCED MANAGEMENT
Matrix
Events
The Matrix group shows the amount of traffic and
number of errors between pairs of devices on a LAN
segment or VLAN. For each pair, the Matrix group
maintains counters of the number of packets,
number of octets, and error packets between the
nodes.
The Events group provides you with the ability to
create entries in an event log and/or send SNMP
traps to the management workstation. Events can
originate from a crossed threshold on any RMON
variable. In addition to the standard five traps
required by SNMP (link up, link down, warm start,
cold start, and authentication failure), RMON adds
two more: rising threshold and falling threshold.
The conversation matrix helps you to examine network statistics in more detail to discover who is talking to whom or if a particular PC is producing more
errors when communicating with its file server, for
example. Combined with Hosts Top N, this allows
you to view the busiest hosts and their primary conversation partners.
Filter
The Filter group provides a mechanism to instruct
the RMON probe to capture packets that match a
specific criterion or condition.
Capture
The Capture group allows you to create capture
buffers on the probe that can be requested and
uploaded to the management workstation for
decoding and presentation.
Effective use of the Events group saves you time;
rather than having to watch real-time graphs for
important occurrences, you can depend on the
Event group for notification. Through the SNMP
traps, events can trigger other actions providing a
mechanism for an automated response to certain
occurrences.
RMON
Benefits of RMON
Using the RMON features of your Switch has three
main advantages:
■
It improves your efficiency
■
It allows you to manage your network in a more
proactive manner
■
It reduces the load on the network and the management workstation
How RMON Improves Your Efficiency
Using RMON probes allows you to remain at one
workstation and collect information from widely dispersed LAN segments or VLANs. This means that the
time taken to reach a problem site, set up equipment, and begin collecting information is largely
eliminated.
How RMON Allows Proactive Management
If they are configured correctly, RMON probes
deliver information before problems occur. This
means that you can take action before they impact
on users. In addition, probes record the behavior of
your network, so that you can analyze the causes of
problems.
5-25
How RMON Reduces the Traffic Load
Traditional network management involves a management workstation polling network devices at
regular intervals to gather statistics and identify
problems or trends. As network sizes and traffic
levels grow, this approach places a strain on the
management workstation and also generates large
amounts of traffic.
An RMON probe, however, autonomously looks at
the network on behalf of the management workstation without affecting the characteristics and performance of the network. The probe reports by
exception, which means that it only informs the
management workstation when the network has
entered an abnormal state.
5-26
CHAPTER 5: ADVANCED MANAGEMENT
RMON and the Switch
RMON requires one probe per LAN segment, and
stand-alone RMON probes have traditionally been
expensive. Therefore, 3Com’s approach has been to
build an inexpensive RMON probe into the SmartAgent of each Switch. This allows RMON to be
widely deployed around the network without costing more than traditional network management.
RMON Features of the Switch
Table 5-2 details the RMON support provided by
the Switch.
Table 5-2
RMON Group
Support supplied by the Switch
Statistics
A new or initialized Switch has one Statistics session per port/VLAN.
History
A new or initialized Switch has three History sessions on the 100BASE-TX port, backbone port
and Default VLAN:
A problem with stand-alone RMON probes is that
they are passive; able to monitor and report, but
nothing more. Placing probe functionality inside the
network device allows integration of RMON with
normal device management to allow proactive management.
For example, statistics can be related to individual
ports and the Switch can take autonomous actions
such as disabling a port (temporarily or permanently)
if errors on that port exceed a pre-defined threshold. Also, since a probe needs to be able to see all
traffic, a stand-alone probe has to be attached to a
non-secure port. Implementing RMON in the Switch
means all ports can have security features enabled.
RMON support supplied by the Switch
Alarms
■
60-second intervals, 120 historical samples
stored
■
30-second intervals, 120 historical samples
stored
■
30-minute intervals, 96 historical samples
stored
Although up to 700 alarms can be defined for
the Switch, a new or initialized Switch has four
alarms defined for each port:
■
Bandwidth used
■
Broadcast bandwidth used
■
Percentage of packets forwarded
■
Errors per 10,000 packets
You can modify these alarms using an RMON
management application, but you cannot create
or delete them.
For more information about the alarms setup on
the Switch, refer to “About Alarm Actions” on
page 5-28 and “About Default Alarm Settings”
on page 5-29.
RMON
Table 5-2
RMON support supplied by the Switch
RMON Group
Support supplied by the Switch
Hosts
Although Hosts is supported by the Switch,
there are no Hosts sessions defined on a new or
initialized Switch by default.
You can specify that a Hosts session is started on
the Default VLAN; for more information, refer to
“Setting Up the Switch Unit” on page 4-9.
Hosts Top N
Although Hosts Top N is supported by the Switch,
there are no Hosts Top N sessions defined on a
new or initialized Switch.
Matrix
Although Matrix is supported by the Switch,
there are no Matrix sessions defined on a new or
initialized Switch by default.
You can specify that a Matrix session is started on
the Default VLAN; for more information, refer to
“Setting Up the Switch Unit” on page 4-9.
Filter
The Filter group is not presently supported by
the Switch.
Capture
The Capture group is not presently supported by
the Switch.
Events
A new or initialized Switch has events defined
for use with the default alarm system. Refer to
“About Default Alarm Settings” on page 5-29 for
more information.
5-27
When using the RMON features of the Switch, you
should note the following:
■
After the default sessions are created, they have
no special status. You can delete or change
them as required.
■
The Switch 1000 can forward a very large volume
of packets per second. The Statistics RMON
group is able to monitor every packet, but the
other groups sample a maximum of 6000 packets
a second.
■
The greater the number of RMON sessions, the
greater the burden on the management resources
of the Switch; however, the forwarding performance of the Switch is not affected.
5-28
CHAPTER 5: ADVANCED MANAGEMENT
About Alarm Actions
You can define up to 700 alarms for the Switch. The
actions that you can define for each alarm are
shown in Table 5-3.
Table 5-3
Alarm Actions
Action
High Threshold
Low Threshold
No action.
Notify only.
Send Trap.
Notify and
blip port.
Send Trap. Block broadcast
and multicast traffic on
the port for 5 seconds.
Notify and
disable port.
Send Trap. Turn port off.
Notify and
enable port.
Send Trap. Turn port
on.
Blip port.
Block broadcast and multicast traffic on the port for
5 seconds.
Disable port.
Turn port off.
Enable port.
Turn port on.
Notify and
move resilient
port.
Send Trap. If port is the
main port of a resilient link
pair then move to standby.
Notify and
blip device.
Send Trap. Block broadcast
and multicast traffic on all
ports for 5 seconds.
Notify and
disable device.
Send trap. Turn all ports
on device off.
Notify and
enable device.
Send Trap. Turn ports
back to original state.
Blip device.
Block broadcast and multicast traffic on all ports for
5 seconds.
Disable device.
Turn all ports on device off.
Re-enable
device.
Turn ports back to
original state.
RMON
About Default Alarm Settings
About the Audit Log
A new or initialized Switch has four alarms defined
for each port:
■
Bandwidth used
■
Broadcast bandwidth used
■
Percentage of packets forwarded
■
Errors per 10,000 packets
Initial settings for the default alarms
Statistic
High
Threshold
Low
Threshold
Recovery
Samples
per
average
Period
4
60 secs
4
20 secs
4
60 secs
4
60 secs
Bandwidth
used
Value: 85%
Value: 50%
No action
No action
Broadcast
bandwidth
used
Value: 20%
Value: 10%
Notify and
blip
No action
Percentage of
packets
forwarded
Value: 85%
Value: 50%
No action
No action
Errors per
Value: 200
10,000 packets Notify
Value: 100
No action
The Switch keeps an audit log of all management
user sessions, providing a record of changes to any
MIB including the RMON MIB. The log can only be
read by users at the security access level using an
SNMP Network Manager.
Each entry in the log contains information in the following order:
The default values for each of these alarms are
given in Table 5-4.
Table 5-4
5-29
■
Entry number
■
Timestamp
■
User ID
■
Item ID (including qualifier)
■
New value of item
There is a limit of 16 records on the number of
changes stored. The oldest records are overwritten
first.
5-30
CHAPTER 5: ADVANCED MANAGEMENT
6
STATUS MONITORING
This chapter describes how to view the current
operating status of the Switch 1000, how to display any error information in a fault log and how
to carry out a remote poll to check the response of
another network device.
It also describes the Statistics screens for the Switch
1000, and advises you on actions to take if you see
unexpected values for the statistics. Please note
however, that as all networks are different, any
actions listed are only recommendations.
Viewing statistics on a regular basis allows you to
see how well your network is performing. If you
keep simple daily records, you will see trends emerging and notice problems arising before they cause
major network faults. This way, statistics can also
help you get the best out of your network.
AND
STATISTICS
6-2
CHAPTER 6: STATUS M ONITORING AND STATISTICS
Summary Statistics
With the Switch Management screen displayed,
choose the management level Unit, then select the
STATISTICS button. The Summary Statistics screen is
displayed, as shown in Figure 6-1.
The Summary Statistics screen lists values for the
current counter against every port on the Switch
1000 and it is refreshed approximately every two
seconds. Once values have reached approximately
4,000,000,000 they are reset to zero.
To view values for a particular counter, select the
first button displayed at the foot of the Summary
Statistics screen. Pressing the spacebar toggles
through the available counters and as soon as you
move away from the button, the screen is refreshed
to show values for that counter.
FRAMES RECEIVED Displays values for the Frames
Received counter; the total number of frames that
have been received by the current port, including
fragments and frames with errors.
FRAMES TRANSMITTED Displays values for the
Frame Transmitted counter; the total number of
frames successfully transmitted by the current port,
including fragments and frames with errors.
FRAMES FORWARDED Displays the total number
of frames that were received by the current port
and forwarded to other ports.
Figure 6-1
Summary Statistics screen (3C16900A)
FRAMES FILTERED Displays the total number of
frames that were filtered because the destination
station was on the same segment (port) as the
source station.
MULTI/BROADCAST (RX) Displays the total number
of frames received by the current port that are
addressed to a multicast or broadcast address.
MULTI/BROADCAST (TX) Displays the total number
of frames transmitted by the current port that are
addressed to a multicast or broadcast address.
ERRORS Displays the total number of errors which
have occurred on the current port. Refer to the field
description for Errors on page 6-5.
CLEAR SCREEN COUNTERS Use this button to set
all counters shown on the screen to zero. Use this
button for analysis if you wish to see changes in
counters over a short period of time. This button
does not clear the counters on the device.
Port Statistics
6-3
Port Statistics
With the Switch Management screen displayed,
choose the management level Port, then select the
STATISTICS button. The Port Statistics screen is displayed, as shown in Figure 6-2. As well as showing
statistics for the port, the Port Statistics screen
allows you access to traffic and error counter
screens.
If the port is an ATM OC-3c Module port, the ATM
Port Statistics screen is displayed. For more information, refer to the “SuperStack® II Switch ATM
OC-3c Module User Guide”.
The Port Statistics screen shows the following:
Port ID The ID of the port you are currently managing.
Bandwidth Used This counter provides a running
average of the bandwidth used by the port,
expressed as a percentage of the maximum bandwidth available for the port. A sampling period of
one minute is used. The value gives an indication of
the general traffic level of the network. A high utilization for single endstation segments is an indication that your network is operating efficiently.
However, if multiple endstations are connected to
this port and you see values of around 40% you
should reconsider the topology of your network
because each user will see degraded network performance.
Figure 6-2
Port Statistics screen
Frames Forwarded This counter provides a running
average of the proportion of frames received by the
port that are forwarded, expressed as a percentage
of all frames received by the port. A sampling
period of one minute is used.
Broadcast Frame Bandwidth This counter provides
a running average of the broadcast frame bandwidth used by the port, expressed as a percentage
of the maximum bandwidth available for the port. A
sampling period of five seconds is used.
Error Frames This counter provides a running average of the number of errors per 10,000 frames
received by the port, expressed as a percentage.
Refer to the field description for Errors on page 6-5.
TRAFFIC STATISTICS Select this button to access
traffic counters for this port.
ERROR ANALYSIS Select this button to access
error counters for this port.
6-4
CHAPTER 6: STATUS M ONITORING AND STATISTICS
Port Traffic Statistics
With the Port Statistics screen displayed, select the
TRAFFIC STATISTICS button. The Port Traffic Statistics
screen is displayed, as shown in Figure 6-3.
The Port Traffic Statistics screen shows the following:
Port ID The ID of the port you are currently managing.
Frames Received The number of valid frames
received by the port, including fragments and
frames with errors.
Frames Transmitted The number of frames that
have been successfully transmitted by the port
including fragments and frames with errors.
Octets Received The number of octets received by
the port. The calculation includes the MAC header
and Cyclical Redundancy Check (CRC), but excludes
preamble/Start-of Frame-Delimiter (SFD). Octet
counters are accurate to the nearest 256 octet
boundary.
Octets Transmitted The number of octets transmitted by the port. The calculation includes the MAC
header and CRC, but excludes preamble/SFD. Octet
counters are accurate to the nearest 256 octet
boundary.
Figure 6-3
Port Traffic Statistics screen
Multicasts Received The number of frames successfully received that have a multicast destination
address. This does not include frames directed to a
broadcast address or frames received with errors.
Broadcasts Received The number of frames
received that have a broadcast destination address.
This does not include frames with errors.
Collisions An estimate of the total number of collisions that occurred when transmitting from the unit.
Collisions are a normal part of Ethernet operation
that occur when two devices attempt to transmit at
the same time. A sudden sustained increase in the
number of collisions may indicate a problem with a
device or cabling on the network, particularly if this
is not accompanied by an increase in general network traffic.
Port Traffic Statistics
Fragments The total number of packets received
that were not an integral number of octets in length
or that had a bad Frame Check Sequence (FCS), and
were less than 64 octets in length (excluding framing bits, but including FCS octets).
6-5
Frame Size Analysis The number of frames of a
specified length as a percentage of the total number
of frames of between 64 and 1518 octets. This indicates the composition of frames in the network.
The frame size ranges are:
Frames Forwarded The total number of frames
which were received by the port and forwarded to
their destination address.
Frames Filtered The total number of frames that
were filtered because the destination address was
on the same segment (port) as the source station.
Errors The total number of errors which have
occurred on this port. Errors can be one of the following:
■
CRC Alignment Errors
■
Short Events
■
Long Frames
■
Late Events
■
Jabbers
The value shown should be a very small proportion
of the total data traffic.
IFM Count The number of times Intelligent Flow
Management (IFM) has had to operate to minimize
packet loss.
■
64 octets
■
65–127 octets
■
128–255 octets
■
256–511 octets
■
512–1023 octets
■
1024–1518 octets
The composition of frames on your network may
help you to analyze the efficiency of your network
layer protocol.
CLEAR SCREEN COUNTERS Select this button to
set all counters shown on the screen to zero. It is
useful for trend analysis if you wish to see changes
in counters over a short period of time. This button
does not clear the counters on the device or affect
counters at the network management workstation.
6-6
CHAPTER 6: STATUS M ONITORING AND STATISTICS
Port Error Analysis
With the Port Statistics screen displayed, select the
ERROR ANALYSIS button. The Port Error Analysis
screen is displayed, as shown in Figure 6-4.
The Port Error Analysis screen shows the following:
Port ID The ID of the port you are currently managing.
CRC Align Errors This counter is incremented by
one for each frame with a CRC (Cyclic Redundancy
Check) error or an alignment error. A CRC error
occurs if a frame of valid length has an invalid CRC
but does not have a framing error. It is likely that a
bit has been corrupted in transmission. An alignment error occurs if a frame has a CRC error and
the frame does not have an integral number of
octets. Alignment errors may be caused by a fault at
the transmitting device.
Check cables and connections for damage. If this
does not solve the problem, try changing the transceiver or adapter card of the device connected to
the port at the source of the problem.
Short Events This counter is incremented by one
for each carrier event whose duration is less than
the short event maximum time. Short events are
error frames smaller than the minimum size defined
for Ethernet frames. They may indicate externally
generated noise causing problems on the network.
Check the cabling routing and re-route any cabling
which may be affected by external noise sources.
Figure 6-4
Port Error Analysis screen
Late Events This counter is incremented by one
each time a collision occurs after the valid packet
minimum time. A late event is an out-of-window
collision that may occur if your Ethernet LAN
exceeds the maximum size as defined in the IEEE
standard. A late event is also counted as a collision.
Long Frames This counter is incremented by one
each time a frame is received whose octet count is
greater than the maximum frame size but less than
Jabber frame size. Long Frames are frames that
exceed the maximum size defined for Ethernet
frames (1518 octets). If you see a high number of
long frames on your network, you should isolate the
source of these frames and examine the transceiver
or adapter card at the device. Some protocols may
generate these frames.
Port Error Analysis
Jabbers The total number of packets received that
were longer than 8K octets (excluding framing bits,
but including FCS octets).
CLEAR SCREEN COUNTERS Select this button to
set all counters shown on the screen to zero. It is
useful for trend analysis if you wish to see changes
in counters over a short period of time. This button
does not clear the counters on the device or affect
counters at the network management workstation.
6-7
6-8
CHAPTER 6: STATUS M ONITORING AND STATISTICS
Status Monitoring
The status screen provides read-only information
about the Switch 1000. This information may be
useful for your Technical Support representative if
you have a problem.
To access the screen, from the Main Menu, select
the STATUS option. The Status screen is displayed,
as shown in Figure 6-5.
The Status screen shows the following:
System Up Time The time the unit has been running since the last reset or power-off/on cycle.
Number Of Resets The total number of system
resets since the Switch was first installed or initialized; either power on, manual reset or a watchdog
expiry.
Last Reset Type Other / Command / Watchdog /
Power-reset / System-error This field indicates the
cause of the last reset. It may be due to management command, watchdog timeout expiry, power
interruption, a manual reset or a system error.
Hardware Version The hardware version number
of the Switch.
Upgradable Software Version The version
number of the agent software image stored in
Flash EPROM. This version number is automatically
updated when you download new software.
Figure 6-5
Status screen
Boot Software Version This is the version number
of the Boot software stored on the Switch 1000.
FAULT LOG Select this button to display the Switch
Fault Log, described the next section.
Fault Log
Fault Log
The Fault Log displays read-only information about
the Switch which is updated whenever an abnormal condition is detected. This information is for
internal 3Com use only. You may be asked to
quote this information if reporting a fault to your
supplier.
With the Status screen displayed, select the FAULT
LOG button. The Fault Log screen is displayed, as
shown in Figure 6-6.
The Fault Log screen shows the following:
Reset Count The number of resets recorded at the
time of the fault.
Time (seconds) The time elapsed since the last
reset when the fault occurred.
Area This information may be used for fault diagnosis by your technical support representative.
Fault Number The hexadecimal number in this field
indicates the type of fault. You should note this
number and contact your technical support representative for advice.
Figure 6-6
Fault Log screen
6-9
6-10
CHAPTER 6: STATUS M ONITORING AND STATISTICS
Remote Polling
The Remote Poll screen allows you to send a single
frame to a remote device to see if that device is
responding. This can help to locate the source of a
network problem. It is also particularly helpful in
locating devices that support IP, IPX and ping but
are not manageable by SNMP.
To poll a device:
1 From the Main Menu, select Remote Poll. The
Remote Poll screen is displayed, as shown in
Figure 6-7.
2 In the Target Address field, enter the IP or IPX
address of the device you want to poll.
3 Select the POLL button at the foot of the screen.
When the poll is complete, the Round Trip Time
field shows the interval in milliseconds between
sending the frame to the target device and receiving
a response at the Switch. If the target device does
not respond after approximately 10 seconds, this
field displays no reply.
Figure 6-7
Remote Poll screen
A
SAFETY INFORMATION
You must read the following safety information
before carrying out any installation or removal of
components, or any maintenance procedures on
the Switch 1000.
■
The appliance coupler, that is, the connector to
the device itself and not the wall plug, must have
a configuration for mating with an
EN60320/IEC320 appliance inlet.
■
For U.S.A. and Canada:
Important Safety Information
■
WARNING: Warnings contain directions that you
must follow for your personal safety. Follow all
instructions carefully.
■
Installation and removal of the unit must be carried out by qualified personnel only.
■
If installing the Switch unit in a stack with SuperStack® II Hub units, the Switch 1000 unit must
be installed below the narrower Hub units.
■
This unit must be earthed.
■
Connect the unit to an earthed power supply to
ensure compliance with European safety standards.
■
The power cord set must be approved for the
country where it will be used.
The minimum specification for the flexible cord
is:
No. 18 AWG
Type SV or SJ
3-conductor
Please read the following safety information thoroughly before installing the Switch 1000.
■
The cord set must be UL-approved and CSA
certified.
■
■
■
The attachment plug must be an
earth-grounding type with a NEMA 5-15P
(15A, 125V) or NEMA 6-15P (15A, 250V) configuration.
For Denmark:
■
■
The cord set must have a rated current capacity of at least 10A.
The supply plug must comply with section
107-2-D1, standard sheet DK2-1a or DK2-5a.
For Switzerland:
■
The supply plug must comply with SEV/ASE
1011.
A-2
APPENDIX A: SAFETY INFORMATION
■
■
It is essential that the mains socket outlet is
installed near to the unit and is accessible. You
can only disconnect the unit by removing the
appliance coupler from the unit.
■
Ensure that the power supply lead is disconnected before opening the IEC connector fuse
cover or removing the cover of the unit.
■
France and Peru only:
If the power supply plug is unsuitable and you
have to replace it, you may find other codings for
the respective connections. Connect the power
supply wires from the unit according to the following scheme:
■
■
■
Brown wire to the Live (Line) plug terminal
which may be marked with the letter L or colored red.
■
■
Blue wire to the Neutral plug terminal which
may be marked with the letter N or colored
black.
Yellow/green wire to the Earth (Ground) plug
terminal which may be marked with the letter
E, or the earth symbol, or colored green/yellow.
■
This unit operates under SELV conditions (Safety
Extra Low Voltage) according to IEC 950, the
conditions of which are maintained only if the
equipment to which it is connected is also operational under SELV.
■
The unit should never be connected to an A.C.
outlet (power supply) without an Earth (Ground)
connection.
■
To comply with European safety standards, a
spare fuse must not be fitted to the appliance
inlet. Only fuses of the same manufacturer,
make and type should be used with the unit.
U.K. only:
■
■
This unit cannot be powered from IT (impedance à la terre) supplies. If your supplies are of
the IT type, this unit should be powered by
230V (2P+T) via an isolation transformer ratio
1:1, with the secondary connection point
labelled Neutral, connected directly to Earth
(Ground).
The Switch 1000 is covered by Oftel General
Approval, NS/G/12345/J/100003, for indirect
connection to a public telecommunications
system. This can only be achieved using the
console port on the unit and an approved
modem.
Do not remove the Plug-in Module or Transceiver
Module blanking plate with the power still connected.
Important Safety Information
Power Supply and Fuse
A-3
RJ45 Ports
The unit automatically adjusts to the supply voltage. The fuse is suitable for both 110V A.C. and
220–240V A.C. operation.
The RJ45 ports are shielded RJ45 data sockets. They
cannot be used as telephone sockets. Only connect
RJ45 data connectors to these sockets.
WARNING: Ensure that the power is disconnected
before opening the fuse holder cover.
Either shielded or unshielded data cables with
shielded or unshielded jacks can be connected to
these data sockets.
Fiber Ports
Under normal viewing conditions, there is no hazard
from the fiber Transmit LED. It is recommended
however, that the LED is not viewed through any
magnifying device whilst it is powered on. It is
advisable that the fiber Tx port and fiber cable ends
are never viewed directly when powered-on.
To change the fuse, release the fuse holder by
gently levering a small screwdriver under the fuse
holder catch. Only 5A Time Delay (anti-surge) fuses
of the same type and manufacture as the original
should be used.
Sockets for Redundant Power System (RPS)
Only connect a 3Com Redundant Power System to
this socket. For details, follow the installation
instructions in the manuals accompanying the
Redundant Power System.
A-4
APPENDIX A: SAFETY INFORMATION
■
L’information de Sécurité Importante
Pour USA et le Canada:
■
AVERTISSEMENT: Les avertissements contiennent
les directions que vous devez suivre pour votre sécurité personnelle. Suivez toutes les directives avec
soin.
■
■
L'installation et l'enlèvement de l'unité doivent
être faits seulement par le personnel qualifié.
■
Si vous entassez l'unité Switch avec les unités
SuperStack II Hub, l'unité Switch 1000 doit être
installée en dessous des unités Hub plus étroites.
■
Cette unité doit être mise à la terre.
■
Brancher l'unité à une source de courant mise à
la terre pour assurer la conformité aux normes de
sécurité européennes.
■
La cordon d'alimentation surmoulé doit être
approuvé pour le pays auquel il sera utilisé.
■
Le socle de connecteur, c'est-à-dire, le connecteur
à l'appareil lui-même et non pas la prise murale,
doit avoir une configuration pour le branchement avec une admission d'appareil
EN60320/IEC320.
Les spécifications minimales pour le cordon
souple sont:
No. 18 AWG
Type 5V ou SJ
3-conducteur
Veuillez lire à fond l'information de la sécurité suivante avant d'installer le Switch 1000.
■
Le cordon surmoulé doit être UL Certifié et
CSA Certifié.
■
Le cordon surmoulé doit avoir une capacité
de courant calculée au moins de 10A.
La fiche de fixation doit être un type mis à la
terre avec une configuration NEMA 5-15P
(15A, 125V) ou NEMA 6-15P (15A, 250V).
■
C'est essentiel que le socle soit installé près de
l'unité et soit accessible. Vous pouvez seulement
débrancher l'unité en enlevant la fiche d'alimentation de la prise de courant.
■
Cette unité marche sous les conditions SELV
(Safety Extra Low Voltage) conformément à
IEC950, ces conditions sont maintenues seulement si le matériel auquel elle est branchée, est
aussi en exploitation sous SELV.
■
L'unité ne devrait pas être branchée à une prise
de courant C.A. (source de courant) sous aucun
prétexte sans un branchement mis à la terre (mis
à la masse).
■
Pour conformer aux normes de sécurité
européennes, un fusible de rechange ne doit pas
être ajusté à l'admission d'appareil. Seulement
les fusibles du même fabricant, construit, et type
doivent être utilisés avec l'unité.
L’information de Sécurité Importante
■
■
Assurer que l'entrée de la source d'alimentation
soit débranchée avant d'ouvrir le couvercle de
fusible du connecteur IEC ou d'enlever le couvercle de l'unité.
Seulement Pour La France et Le Pérou:
■
■
Cette unité ne peut pas être mise en marche
des sources de courant IT (Impédance à la
terre). Si vos sources de courant sont de type
IT, cette unité doit être alimentée par 230V
(2P+T) via un rapport de transformation d'isolation de 1:1, avec un point de connexion secondaire étiqueté Neutre, branché directement
à la Terre (à la Masse).
A-5
La Source de Courant et Le Fusible
L'unité s'ajuste automatiquement à la tension d'alimentation. Le fusible est convenable aux deux
opérations 110 V C.A. et 220–240 V C.A.
AVERTISSEMENT: Assurer que l'alimentation soit
débranchée avant d'ouvrir le couvercle du contenant
du fusible.
Ne pas enlever le Plug-in Module ou la plaque
d'occultation de module d'émetteur-récepteur
avec la puissance encore branchée.
Pour changer le fusible, dégager le contenant du
fusible en mettant doucement un petit tournevis
sous l'arrêt de contenant du fusible. Seulement les
fusibles de types 5A anti-transitoires du même type
et fabricant que l'original doivent être utilisés.
Socle Pour Alimentation Multiple
Brancher seulement une alimentation multiple de
3Com à cet socle. Suivre pour les détails les directives de l'installation dans le manuel qui accompagne l'alimentation multiple.
A-6
APPENDIX A: SAFETY INFORMATION
Les Ports RJ45
Ceux-ci sont les prises de courant de données RJ45
protégées. Ils ne peuvent pas être utilisés comme
prises de courant téléphoniques. Brancher seulement les connecteurs RJ45 de données à ces prises
de courant.
Les câbles de données blindés ou non blindés, avec
les jacks blindés ou non blindés, l'un ou l'autre,
peuvent être branchés à ces prises de courant de
données.
Les Ports Fibre
Sous les conditions de visionnement ordinaires, il n'y
a pas de danger à l'oeil à cause de la diode électroluminescente d'émission. C'est recommandé,
cependant, que la diode électroluminescente ne
soit pas examinée avec aucun appareil de grossissement pendant qu'elle est sous tension. C'est
recommandé que le port de fibre Tx et les fins de
câble du fibre ne soient jamais directement examinées pendant qu'ils soient sous tension.
Wichtige Sicherheitsinformationen
■
Es ist wichtig, daß der Netzstecker sich in unmittelbarer Nähe zum Gerät befindet und leicht erreichbar ist. Das Gerät kann nur durch
Herausziehen des Verbindungssteckers aus der
Steckdose vom Stromnetz getrennt werden.
■
Das Gerät wird mit Sicherheits-Kleinspannung
nach IEC 950 (SELV = Safety Extra Low Voltage)
betrieben. Angeschloßen werden können nur
Geräte, die ebenfalls nach SELV betrieben werden.
■
Das Gerät ist unter keinen Umständen an einen
Wechselstrom (A.C.) Netzstecker anzuschließen
ohne Erdungsleitung.
■
Um Übereinstimmung mit den europäischen
Sicherheitsnormen zu gewährleisten, darf am
Zuführungstecker des Gerätes keine
Ersatzsicherung angebracht werden. Nur
Sicherungen der gleichen Herstellung und Marke
sowie des gleichen Typs für das Gerät verwenden.
■
Vorm Öffnen der Abdeckungsklappe der IEC
Steckverbindungssicherung oder vorm Abnehmen der Gesamtabdeckung der Gerät sicherstellen, daß das Stromverbindungskabel vom
Netzstrom getrennt ist.
■
Die Austastplatten der Plug-in Module - oder
Sendeempfänger-Module nicht entfernen,
solange die Einheit ans Stromnetz angeschlossen
ist.
Wichtige Sicherheitsinformationen
WARNUNG: Warnungen enthalten Anweisungen,
die zur eigenen Sicherheit unbedingt zu beachten
sind. Bitte befolgen Sie alle Anweisungen sorgfältig
und genau.
Bitte unbedingt vor dem Einbauen des Switch 1000
Einheit die folgenden Sicherheitsanweisungen
durchlesen.
■
Ein- und Ausbau des Gerätes ist nur von
Fachpersonal vorzunehmen.
■
Wenn die Switch 1000 Einheit in einer Stapel
mit anderen SuperStack II Hub Einheiten eingebaut werden soll, muß die Switch 1000 Einheit
unter die schmaleren Hub Einheiten eingebaut
werden.
■
Dieses Gerät muß geerdet sein.
■
Das Gerät an geerdete Stromversorgung
anschließen, um eine Übereinstimmung mit den
europäischen Sicherheitsbestimmungen zu
gewährleisten.
■
Der Anschlußkabelsatz muß mit den Bestimmungen des Landes übereinstimmen, in dem er verwendet werden soll.
■
Die Anordnung der Gerätsteckvorrichtung, d.h.
die Steckverbindung am Gerät selbst im Gegensatz zum Wandstecker, muß in den
EN60320/IEC320 Zuführungsstecker am Gerät
passen.
A-7
A-8
APPENDIX A: SAFETY INFORMATION
Stromversorgung und Sicherung
Das Gerät stellt sich automatisch auf die Versorgungsspannung ein. Die Sicherung ist sowohl für
110V A.C. wie für 220–240V A.C. geeignet.
WARNUNG: Vor dem Öffnen der Sicherungshalterung das Gerät vom Netzstrom trennen.
RJ45 Anschlußen
Hierbei handelt es sich um abgeschirmte RJ45
Datenbuchsen, die nicht als Telefonbuchsen verwendbar sind. Nur RJ45 Datensteckverbinder an
diese Buchsen anschließen.
Diese Datenstecker können entweder mit abgeschirmten oder unabgeschirmten Datenkabeln mit
abgeschirmten oder unabgeschirmten Klinkenstekkern verbunden werden.
Glasfaser Anschlußen
Zum Auswechseln der Sicherung durch leichtes
Heben mit einem kleinen Schraubenzieher die
Abdeckungsklappe der Sicherungshalterung lösen.
Sicherungen nur durch gleichen Typ und Wert wie
die Originalsicherung ersetzen. Sicherung auswechseln und die Klappe der Sicherungshalterung
wieder schließen.
Steckdose für Redundant Power System (RPS)
Nur ein 3Com Redundant Power System an diese
Steckdose anschließen. Für weitere Angaben die
genauen Einbauanweisungen im Handbuch zum
Redundant Power System befolgen.
Unter normalen Umständen geht von der übertragenden LED keine Gefahr für die Augen aus. Es
wird aber empfohlen, die LED nicht durch Vergrößerungslinsen zu betrachten solange die Leuchtdiode unter Strom steht. Ebenso ist es ratsam den
Glasfaser Tx Anschluß und die Enden der Glasfaserkabel nicht direkt zu betrachten solange diese unter
Strom stehen.
B
SCREEN ACCESS RIGHTS
The following table lists the rights assigned to each
level of user for accessing and editing Switch 1000
screens via the VT100 interface.
All access rights are read-and-write unless otherwise stated.
Screen
Port Traffic Statistics
Available to...
Monitor
Manager
Security
Port Error Analysis
Monitor
Manager
Security
Screen
Available to...
Logon
Monitor
Manager
Manager
Security
Security
Main Menu
Manager
Security
Unit Statistics
Monitor
Monitor
Manager
Manager
Security
Unit Database View
Monitor read-only
Security
Monitor
Manager
Manager
Port Statistics
Monitor read-only
Manager
Security
Port STP
Port Setup
Monitor
Monitor
Security
Switch Management
Port Resilience
Security
Unit Resilience
Monitor
Monitor
Manager
Manager
Security
Security
Unit Setup
Monitor read-only
Manager
Security
B-2
APPENDIX B: SCREEN ACCESS RIGHTS
Screen
Available to...
Screen
VLAN STP
Monitor read-only
Trap Setup
Manager
VLAN Setup
User Access Levels
Monitor read-only
Manager
Security
Monitor read-only
Software Upgrade
Security
Manager
Initialize
Security
Security
Reset
Monitor
Local Security
Security
Create User
Security
Delete Users
Security
Edit User
Monitor
Manager
Security
Monitor
Manager
Security
Monitor
Manager
Security
Management Setup
Monitor read-only
Security
Security
Fault Log
Security
Console Port Setup
Manager
Manager
Status
Monitor read-only
Manager
Security
VLAN Server
Available to...
Monitor read-only
Manager
Security
Manager
Security
Remote Poll
Manager
Security
C
TROUBLE-SHOOTING
The following is a list of problems you may see
when managing the Switch with suggested courses
of corrective action to take. If you have a problem
which is not listed here and you cannot solve it,
please contact your local technical support representative.
The Plug-in Module Status LED lights yellow:
If the MGMT LED is flashing yellow, the Module
has failed its Power On Self Test; refer to the previous advice. Otherwise, the Module’s agent software
is not installed correctly. Refer to the User Guide
supplied with the Module.
The Plug-in Module Status LED flashes yellow:
LEDs
Power LED does not light:
Check that the power cable is firmly connected to
the device and to the supply outlet.
Check the unit fuse. For information on changing
the fuse, refer to “Power Supply and Fuse” in
Appendix A.
On powering-up, the MGMT LED lights yellow:
The unit has failed its Power On Self Test (POST) and
you should contact your supplier for advice.
On powering-up, the MGMT LED flashes yellow:
The installed Plug-in Module has failed its Power
On Self Test (POST). Try re-installing the Plug-in
Module, ensuring it is properly seated. If the problem persists, contact your supplier for advice.
The Module is not recognized. You may need to
download a version of the Switch’s management
agent software that recognizes the Module (refer to
“Upgrading Software” on page 4-29), or remove
the Module. Contact your supplier for further
advice.
A link is connected and yet the Status LED does
not light:
Check that:
■
All connections are secure
■
Fiber cables are free from damage
■
The devices at both ends of the link are
powered-up
■
The connection uses cross-over cable if you are
linking a 10BASE-T or 100BASE-TX port with a
device which is MDIX-only
C-2
APPENDIX C: TROUBLE-SHOOTING
Using the VT100 Interface
The initial Main Banner screen does not
display:
Check that your terminal or terminal emulator is
correctly configured to operate as a VT100 terminal.
For console port access, you may need to press
[Return] several times before the Main Banner
appears.
Check the settings on your terminal or terminal
emulator. The management facility's auto configuration works only with baud rates from 1200 to
19,200.
Check that you are using a suitable font (for example, in HyperTerminal use the MS Line Draw font).
Screens are incorrectly displayed:
Check that your terminal or terminal emulator is
correctly configured to operate as a VT100 terminal.
Check the settings on your terminal or terminal
emulator. The management facility's autoconfiguration works only with baud rates from 1200 to
19,200.
The SNMP Network Manager cannot access the
device:
Check that the device's IP address, subnet mask and
default router are correctly configured, and that the
device has been reset.
Check that the device's IP address is correctly
recorded by the SNMP Network Manager (refer to
the user documentation for the Network Manager).
The Telnet workstation cannot access the
device:
Check the device's IP address, subnet mask and
default router are correctly configured, and that the
device has been reset. Ensure that you enter the IP
address of the Switch correctly when invoking the
Telnet facility.
Traps are not received by the SNMP Network
Manager:
Check that the SNMP Network Manager's IP address
and community string are correctly configured.
The SNMP Network Manager or Telnet workstation can no longer access the device:
Check that Remote Telnet access or Community-SNMP access is enabled.
Check that the port through which you are trying to
access the device has not been disabled; refer to
“Setting Up the Switch Ports” on page 4-12. If it is
enabled, check the connections and network cabling
at the port.
Check that the port through which you are trying to
access the device is in VLAN 1 (the Default VLAN).
Refer to “Setting Up VLANs on the Switch” on page
5-8.
Using the Switch
Try accessing the device through a different port. If
you can now access the device, a problem with the
original port is indicated. Re-examine the connections and cabling.
There may be a network problem preventing you
accessing the device over the network. Try accessing the device through the console port.
You forget your password and cannot log in:
If you are not one of the default users (monitor,
manager or security), another user having ‘security’
access level can log in, delete your user name, and
create a new user name for you, with a new password.
Alternatively, another user having ‘security’ access
level can log in and initialize the device. This will
return all configuration information, including passwords, to the initial values.
In the case where no-one knows a password for a
security level user, contact your supplier.
C-3
Using the Switch
You see network problems and the Packet LED
is on continuously with constant collisions
(viewed using the Port Traffic Statistics screen,
refer to “Port Traffic Statistics” on page 6-4):
You are using PACE equipped devices and have the
Interactive Access feature of PACE enabled at both
ends of the link. Interactive Access must only be
enabled at one end of the Switch-device link. Disabling Interactive Access for a Switch port as
described in “Setting Up the Switch Ports” on page
4-12.
You have configured a Switch port so that it
‘blips’ when a broadcast storm occurs, but the
port does not blip properly:
The broadcast storms are occurring such that the
average broadcast bandwidth cannot drop below
the Falling Threshold value. This means that the
blip only occurs once.
Try changing the following attributes in the Broadcast Storm Control section of the Port Setup screen:
■
Rising Action to disable port/notify.
■
Falling Action to event + enable.
For more information, refer to “Setting Up the
Switch Ports” on page 4-12.
C-4
APPENDIX C: TROUBLE-SHOOTING
You have added the Switch 1000 to an already
busy network, and response times and traffic
levels have increased:
You may have added a group of users to one of the
Switch 1000 ports via a repeater or switch, and not
turned off IFM. Turn off IFM on any port that is connected to multiple devices. Refer to “Setting Up the
Switch Ports” on page 4-12.
3 If the network has less than 500 addresses, specify
that the bridging mode of the Switch is set to Forward to All; refer to “Setting Up the Switch Unit”
on page 4-9.
4 Consider disabling STP on the Switch, and using
resilient links to provide network resilience; refer to
“Enabling STP on the Switch” on page 5-17 and
“Setting Up Resilient Links” on page 4-19.
You have connected an endstation directly to
the Switch and the endstation fails to boot correctly:
You are trying to manage the Switch over a
network which has STP, and you are losing contact with the management agent intermittently:
The Switch has STP enabled, and the endstation is
booting before the STP initialization process is complete. Specify that the port has Fast Start enabled,
and then reboot the endstation. For more information about specifying Fast Start for a port, refer to
“Configuring the STP Parameters of Ports” on page
5-20.
As shown in Figure C-1, there is a SuperStack II
Switch unit (Switch A) between your management
workstation and the Switch 1000 (Switch B). You
have configured more than one VLAN on both
Switch units, and there is a parallel STP path for
each VLAN between the Switch units.
The Switch keeps ageing out endstation entries
in the Switch Database (SDB):
The Switch has STP enabled, and STP is instructing
the Switch to age entries in the SDB faster because
topology changes are occurring in the network.
1 Reduce the number of topology changes by
enabling Fast Start for all ports which are directly
connected to an endstation; refer to “Configuring
the STP Parameters of Ports” on page 5-20.
2 Specify that the endstation entries are Non-ageing;
refer to “Setting Up the Switch Database (SDB)” on
page 4-16.
When Switch B transmits BPDUs across a VLAN
other than VLAN 1, Switch A learns the MAC
address of Switch B through the port on that
VLAN. The management agent of Switch B is only
accessible through VLAN 1, and so your management workstation cannot communicate with Switch
B until it transmits BPDUs across VLAN 1. When that
occurs, Switch A learns the MAC address of Switch
B through the port on VLAN 1.
Using the Switch
C-5
To avoid this situation, we recommend that you
connect the two SuperStack II Switch units using a
Virtual LAN Trunk (VLT). For more information
about VLTs, refer to “Connecting Common VLANs
Between Switch Units” on page 5-3.
Figure C-1
Network configuration that results in loss of contact
C-6
APPENDIX C: TROUBLE-SHOOTING
D
PIN-OUTS
Null Modem Cable
9-pin to RS-232 25-pin
PC-AT Serial Cable
9-pin to 9-pin
D-2
APPENDIX D: PIN-OUTS
Modem Cable
9-pin to RS-232 25-pin
RJ45 Pin Assignments
Pin assignments are identical for 10BASE-T and
100BASE-TX RJ45 connectors.
E
SWITCH 1000 TECHNICAL SPECIFICATIONS
Physical Dimensions
Height: 76mm (3.0in.) x Width: 483mm (19.0in.) x Depth: 300mm (12.0in.)
Weight: 4.4kg (9.7lbs)
Environmental Requirements
Operating Temperature
0–50°C (32–122°F)
Storage Temperature
-10–70°C (14–158°F)
Operating Humidity
10–95% relative humidity, non-condensing
Standards
EN60068 (IEC68)
Safety
Agency Certifications
UL 1950, EN60950, CSA 22.2 No. 950
AC Protection
5A Time Delay Fuse
Electromagnetic Compatibility
EN55022 Class B*, FCC Part 15 Subpart B Class A, ICES-003 Class A, VCCI Class 2*, AS/NZS 3548 Class B*,
EN 50082-1
* Category 5 screened cables must be used to ensure compliance with the Class B/Class 2 requirements of
this standard. The use of unscreened cables (Category 5 for 100BASE-TX ports, and Category 3 and 5 for
10BASE-T ports) complies with the Class A/Class 1 requirements.
Heat Dissipation
100W maximum (341 BTU/hour maximum)
Power Supply
AC Line Frequency
50–60 Hz
Input Voltage Options
100–120 / 200–240 VAC
Current Rating
3A (maximum) at 100 VAC / 2A (maximum) at 200 VAC
E-2
APPENDIX E: SWITCH 1000 TECHNICAL SPECIFICATIONS
Standards Supported
SNMP
Protocols Used for Administration
SNMP protocol (RFC 1157)
UDP (RFC 768)
MIB-II (RFC 1213)
IP (RFC 791)
Bridge MIB (RFC 1493)
ICMP (RFC 792)
Repeater MIB (RFC 1516)
TCP (RFC 793)
VLAN MIB (RFC 1573)
ARP (RFC 826)
RMON MIB (RFC 1271 and RFC 1757)
TFTP (RFC 783)
Terminal Emulation
BOOTP (RFC 951)
Telnet (RFC 854)
F
TECHNICAL SUPPORT
3Com provides easy access to technical support
information through a variety of services. This
appendix describes these services.
Information contained in this appendix is correct at
time of publication. For the very latest, we recommend that you access 3Com Corporation’s World
Wide Web site.
Online Technical Services
3Com offers worldwide product support 24 hours a
day, 7 days a week, through the following online
systems:
■
World Wide Web site
■
3Com Bulletin Board Service (3ComBBS)
■
3ComFactsSM automated fax service
■
3ComForum on CompuServe® online service
World Wide Web Site
Access the latest networking information on 3Com
Corporation’s World Wide Web site by entering our
URL into your Internet browser:
http://www.3Com.com/
This service features news and information about
3Com products, customer service and support,
3Com Corporation’s latest news releases, NetAge®
Magazine, technical documentation and more.
3Com Bulletin Board Service
3ComBBS contains patches, software, and drivers
for all 3Com products, as well as technical articles.
This service is available via modem or ISDN 24 hours
a day, 7 days a week.
Access by Analog Modem
To reach the service by modem, set your modem to
8 data bits, no parity, and 1 stop bit. Call the
telephone number nearest you:
Country
Data Rate
Telephone Number
Australia
up to 14400 bps
61 2 9955 2073
Brazil
up to 14400 bps
55 11 547 9666
France
up to 14400 bps
33 1 6986 6954
Germany
up to 28800 bps
4989 62732 188
Hong Kong
up to 14400 bps
852 2537 5608
Italy (fee required) up to 14400 bps
39 2 27300680
Japan
up to 14400 bps
81 3 3345 7266
Mexico
up to 28800 bps
52 5 520 7853
P. R. of China
up to 14400 bps
86 10 684 92351
Singapore
up to 14400 bps
65 534 5693
F-2
APPENDIX F: TECHNICAL SUPPORT
Country
Data Rate
Telephone Number
Taiwan
up to 14400 bps
886 2 377 5840
U.K.
up to 28800 bps
44 1442 438278
U.S.A.
up to 28800 bps
1 408 980 8204
Local access numbers are available within the
following countries:
Country
Telephone
Number
Country
Telephone
Number
Australia
1 800 123853
Netherlands
06 0228049
Access by Digital Modem
Belgium
0800 71279
Norway
800 11062
ISDN users can dial in to 3ComBBS using a digital
modem for fast access up to 56 Kbps. To access
3ComBBS using ISDN, use the following number:
Denmark
800 17319
Portugal
0505 442 607
Finland
98 001 4444
Russia
(Moscow only)
956 0815
France
05 90 81 58
Spain
900 964 445
Germany
0130 81 80 63
Sweden
020 792954
Italy
1678 99085
U.K.
0800 626403
(1) 408 654 2703
3ComFacts Automated Fax Service
3Com Corporation’s interactive fax service,
3ComFacts, provides data sheets, technical articles,
diagrams, and troubleshooting instructions on 3Com
products 24 hours a day, 7 days a week.
Call 3ComFacts using your Touch-Tone telephone
using one of these international access numbers:
3ComForum on CompuServe Online Service
3ComForum contains patches, software, drivers, and
technical articles about all 3Com products, as well
as a messaging section for peer support. To use
3ComForum, you need a CompuServe account.
To use 3ComForum:
Country
Telephone Number
Hong Kong
852 2537 5610
U.K.
44 1442 438279
U.S.A.
1 408 727 7021
1 Log on to your CompuServe account.
2 Type go threecom
3 Press [Return] to see the 3ComForum main menu.
Support from Your Network Supplier
Support from Your Network Supplier
If additional assistance is required, contact your
network supplier. Many suppliers are authorized
3Com service partners who are qualified to provide
a variety of services, including network planning,
installation, hardware maintenance, application
training, and support services.
When you contact your network supplier for assistance, have the following information ready:
■
A list of system hardware and software, including revision levels
■
Diagnostic error messages
■
Details about recent configuration changes, if
applicable
If you are unable to contact your network supplier,
see the following section on how to contact 3Com.
Support from 3Com
If you are unable to receive support from your
network supplier, technical support contracts are
available from 3Com.
Contact your local 3Com sales office to find your
authorized service provider using one of these
numbers:
Regional Sales
Office
Telephone Number
3Com Corporation
U.S.
800 NET 3Com or
1 408 764 5000
3Com ANZA
East
West
61 2 9937 5000
61 3 9866 8022
3Com Asia Limited
P. R. of China
F-3
Hong Kong
India
Indonesia
Korea
Malaysia
Singapore
Taiwan (R.O.C.)
Thailand
86 10 68492 568 (Beijing)
86 21 6374 0220 Ext 6115 (Shanghai)
852 2501 1111
91 11 644 3974
62 21 523 9181
82 2 319 4711
60 3 732 7910
65 538 9368
886 2 377 5850
662 231 8151 4
3Com Benelux B.V.
Belgium
Netherlands
32 725 0202
31 30 6029700
3Com Canada
Calgary
Montreal
Ottawa
Toronto
Vancouver
403
514
613
416
604
3Com France
33 1 69 86 68 00
3Com GmbH
Austria
Czech/Slovak Republics
Germany
265
683
566
498
434
3266
3266
7055
3266
3266
Hungary
Poland
Switzerland
43
42
49
49
36
48
41
1 5134323
2 21845 800
30 3498790 (Berlin)
89 627320 (Munich)
1 250 83 41
22 6451351
31 996 14 14
3Com Ireland
353 1 820 7077
3Com Japan
81 3 3345 7251
F-4
APPENDIX F: TECHNICAL SUPPORT
Regional Sales Office Telephone Number
Location
Telephone Number
Fax Number
3Com Latin America
Argentina
Brazil
Chile
Colombia
Mexico
Peru
Venezuela
U.S.A. and Canada
1 800 876 3266,
option 2
408 764 7120
Latin America
1 408 326 7801
408 764 7120
Europe, South
Africa and Middle
East
44 1442 438125
44 1442 435822
Elsewhere
1 408 326 7804
1 408 764 7120
3Com Mediterraneo
Italy
54
55
56
57
52
51
58
1 312 3266
11 546 0869
2 633 9242
1 629 4110
5 520 7841
1 221 5399
2 953 8122
39 2 253011 (Milan)
39 6 5279941 (Rome)
3Com Middle East
971 4 349049
3Com Nordic AB
Denmark
Finland
Norway
Sweden
45 39 27 85 00
358 0 435 420 67
47 22 18 40 03
46 8 632 56 00
3Com Russia
007 095 2580940
3Com South Africa
27 11 807 4397
3Com U.K. Limited
44 131 2478558 (Edinburgh)
44 161 8737717 (Manchester)
44 1628 897000 (Marlow)
Returning Products for Repair
Before you send a product directly to 3Com for
repair, you must first be obtain a Return Materials
Authorization (RMA) number. Products sent to
3Com without RMA numbers will be returned to
the sender unopened, at the sender’s expense.
To obtain an RMA number, call or fax:
02/06/97
GLOSSARY
10BASE-T
The IEEE 802.3 specification for Ethernet over
Unshielded Twisted Pair (UTP) cabling.
100BASE-FX
100Mbps Ethernet implementation over fiber.
100BASE-TX
100Mbps Ethernet implementation over Category 5
and Type 1 Twisted Pair cabling.
ageing
The automatic removal of dynamic entries from the
Switch Database which have timed-out and are no
longer valid.
ATM
Asynchronous Transfer Mode. A connection oriented transmission protocol based on fixed length
cells (packets). ATM is designed to carry a complete
range of user traffic, including voice, data and video
signals.
backbone
The part of a network used as the primary path for
transporting traffic between network segments.
backbone port
A port which does not learn device addresses, and
which receives all frames with an unknown address.
Backbone ports are normally used to connect the
Switch to the backbone of your network. Note that
backbone ports were formerly known as designated
downlink ports.
bandwidth
Information capacity, measured in bits per second,
that a channel can transmit. The bandwidth of
Ethernet is 10Mbps, the bandwidth of Fast Ethernet is 100Mbps.
baud rate
The switching speed of a line. Also known as line
speed.
BOOTP
The BOOTP protocol allows you to automatically
map an IP address to a given MAC address each
time a device is started. In addition, the protocol
can assign the subnet mask and default gateway to
a device.
2
G LOSSARY
bridge
data center switching
A device that interconnects local or remote networks no matter what higher level protocols are
involved. Bridges form a single logical network, centralizing network administration.
The point of aggregation within a corporate network where a switch provides high-performance
access to server farms, a high-speed backbone connection and a control point for network management and security.
broadcast
A message sent to all destination devices on the
network.
Ethernet
A LAN specification developed jointly by Xerox,
Intel and Digital Equipment Corporation. Ethernet
networks operate at 10Mbps using CSMA/CD to run
over cabling.
broadcast storm
Multiple simultaneous broadcasts that typically
absorb available network bandwidth and can cause
network failure.
Fast Ethernet
100Mbps technology based on the Ethernet/CD network access method.
console port
The port on the Switch accepting a terminal or
modem connector. It changes the parallel arrangement of data within computers to the serial form
used on data transmission links. This port is most
often used for dedicated local management.
forwarding
The process of sending a frame toward its destination by an internetworking device.
full duplex
CSMA/CD
Channel access method used by Ethernet and IEEE
802.3 standards in which devices transmit only
after finding the data channel clear for some period
of time. When two devices transmit simultaneously,
a collision occurs and the colliding devices delay
their retransmissions for a random amount of time.
A system which allows frames to be transmitted and
received simultaneously and, in effect, doubles the
potential throughput of a link.
IFM
Intelligent Flow Management. A means of holding
packets back at the transmit port of the connected
endstation. Prevents packet loss at a congested
switch port.
GLOSSARY
Intelligent Switching Mode
A packet forwarding mode, where the Switch monitors the amount of error traffic on the network and
changes the method of packet forwarding accordingly.
3
main port
The port in a resilient link that carries data traffic in
normal operating conditions.
MDI / MDIX
Medium Dependent Interface. A type of Ethernet
twisted pair port connection: MDI ports connect to
MDIX (cross-over) ports using straight-through
twisted pair cabling; MDI-to-MDI and MDIX-to-MDIX
links use cross-over twisted pair cabling.
IPX
Internetwork Packet Exchange. A protocol allowing
communication in a NetWare network.
IP address
Internet Protocol address. A unique identifier for a
device attached to a network using TCP/IP. The
address is written as four octets separated with
full-stops (periods), and is made up of a network
section, an optional subnet section and a host section.
LAN
MIB
Management Information Base. Stores a device’s
management characteristics and parameters. MIBs
are used by the Simple Network Management Protocol (SNMP) to contain attributes of their managed
systems. The Switch contains its own internal MIB.
multicast
Local Area Network. A network of connected computing resources (such as PCs, printers, servers) covering a relatively small geographic area (usually not
larger than a floor or building). Characterized by
high data rates and low error rates.
Single packets copied to a specific subset of network addresses. These addresses are specified in
the destination-address field of the packet.
PACE
Priority Access Control Enabled. 3Com’s innovative
technology which works in conjunction with a
switch to control the latency and jitter associated
with the transmission of multimedia traffic over
Ethernet and Fast Ethernet.
latency
The delay between the time a device receives a
frame and the time the frame is forwarded out of
the destination port.
line speed
See baud rate.
POST
Power On Self Test. An internal test that the Switch
carries out when it is powered-up.
4
G LOSSARY
protocol
SmartAgent
A set of rules for communication between devices
on a network. The rules dictate format, timing,
sequencing and error control.
Intelligent management agents in devices and logical connectivity systems that reduce the computational load on the network management station and
reduce management-oriented traffic on the network.
resilient link
A pair of ports that can be configured so that one
will take over data transmission should the other
fail. See also main port and standby port.
SNMP
Simple Network Management Protocol. A protocol
originally designed to be used in managing TCP/IP
internets. SNMP is presently implemented on a
wide range of computers and networking equipment and may be used to manage many aspects of
network and endstation operation.
RJ45
Standard 8-wire connectors for IEEE 802.3 10BASE-T
networks.
RMON
Remote Monitoring. Subset of SNMP MIB II which
allows monitoring and management capabilities by
addressing up to ten different groups of information.
Spanning Tree Protocol (STP)
A bridge-based system for providing fault tolerance
on networks. STP works by allowing you to implement parallel paths for network traffic, and ensure
that redundant paths are disabled when the main
paths are operational and enabled if the main
paths fail.
RPS
Redundant Power System. Part of the SuperStack II
product range, provides a backup source of power
when connected to the Switch.
standby port
The port in a resilient link that will take over data
transmission if the main port in the link fails.
server farm
A cluster of servers in a centralized location serving
a large user population.
STP
See Spanning Tree Protocol (STP).
SLIP
Serial Line Internet Protocol. A protocol which
allows IP to run over a serial line connection.
GLOSSARY
switch
VLAN
A device which filters, forwards and floods frames
based on the frame’s destination address. The
switch learns the addresses associated with each
switch port and builds tables based on this information to be used for the switching decision.
Virtual LAN. A group of location- and topology-independent devices that communicate as if
they are on a common physical LAN.
VLT
Virtual LAN Trunk. A Switch-to-Switch link which
carries traffic for all the VLANs on each Switch.
TCP/IP
A layered set of communications protocols providing
Telnet terminal emulation, FTP file transfer, and other
services for communication among a wide range of
computer equipment.
Telnet
A TCP/IP application protocol that provides virtual
terminal service, letting a user log in to another
computer system and access a host as if the user
were connected directly to the host.
TFTP
Trivial File Transfer Protocol. Allows you to transfer
files (such as software upgrades) from a remote
device using your Switch’s local management capabilities.
Transcend®
3Com’s umbrella management system used to
manage all of 3Com’s networking solutions.
UDP
User Datagram protocol. An Internet standard protocol that allows an application program on one
device to send a datagram to an application program on another device.
VT100
A type of terminal which uses ASCII characters.
VT100 screens have a text-based appearance.
5
6
G LOSSARY
INDEX
Numerics
100BASE-TX port 1-2, 1-11
10BASE-T port 1-2, 1-11
3Com Bulletin Board Service (3ComBBS) F-1
3Com sales offices F-3
3Com URL F-1
3ComFacts F-2
3ComForum F-2
A
Access Level field 4-3
access rights B-1
Active Port field 4-21, 4-22
ageing entries 4-16
ageing time, specifying 4-11
agent software version number 6-8
alarm actions 5-28
alarm settings, default 5-29
Alarms (RMON group) 5-23
Asynchronous Transfer Mode. See ATM
ATM 1-2
ATM Module 1-2
ATM networks, extending VLANs into 5-5
audit log 5-29
Auto Config field 4-25
auto logout 3-12
Auto Logout screen 3-12
AutoSelect VLAN Mode 5-3
specifying 5-11
B
backbone port 1-2, 5-8
specifying 5-10
Backbone Port field 4-11, 5-9
Backup VLAN Server IP Address field 5-11
baud rate. See line speed
boot software version number 6-8
BOOTP Select field 3-10
BOOTP server 3-6
BPDUs. See Bridge Protocol Data Units
Bridge Forward Delay field 5-19
Bridge Hello Time field 5-19
Bridge Identifier 5-14
Bridge Max Age field 5-19
Bridge Priority field 5-19
Bridge Protocol Data Units 5-14
bridges vs Switch 1000 1-3
Bridging Mode field 4-10
Broadcast Storm Control field 4-14
Bulletin Board Service F-1
C
cable
maximum length 1-11, 2-2
pin-outs D-1
Capture (RMON group) 5-24
Char Size field 4-26
Community String field 4-3, 4-5, 4-24
community strings
changing 4-5
role in trap setup 4-24
Community-SNMP field 4-6
CompuServe F-2
Confirm Password field 4-5
Connection Type field 4-25
console port 1-13
auto-configuration 4-25
connecting equipment to 2-7
connection type 4-25
setting up 4-25
speed 4-25
Console Port field 4-6
Console Port Setup screen 4-25
conventions
notice icons, About This Guide 2
text, About This Guide 2
counters
Bandwidth Used (port) 6-3
Broadcast Frame Bandwidth (port) 6-3
Broadcast Received (port traffic) 6-4
Collisions (port traffic) 6-4
CRC Align Errors (port error) 6-6
Errors (port traffic) 6-5
Errors (port) 6-3
Errors (summary) 6-2
Fragments (port traffic) 6-5
Frame Size Analysis (port traffic) 6-5
Frames Filtered (port traffic) 6-5
Frames Filtered (summary) 6-2
Frames Forwarded (port traffic) 6-5
Frames Forwarded (port) 6-3
Frames Forwarded (summary) 6-2
Frames Received (port traffic) 6-4
Frames Received (summary) 6-2
Frames Transmitted (port traffic) 6-4
Frames Transmitted (summary) 6-2
IFM Count (port traffic) 6-5
Jabbers (port error) 6-7
Late Events (port error) 6-6
Long Frames (port error) 6-6
Multicasts Received (port traffic) 6-4
Multicasts Received (summary) 6-2
Multicasts Transmitted (summary) 6-2
Octets Received (port traffic) 6-4
Octets Transmitted (port traffic) 6-4
2
INDEX
resetting to zero 6-2, 6-5, 6-7
Short Events (port error) 6-6
Create User screen 4-3
D
Data Link Protocol field 3-10
database. See Switch Database
DCD Control field 4-25
default
passwords 3-7
settings 1-14
users 3-7
Default RMON Host/Matrix field 4-11
Default Router field 3-10
Default VLAN 5-3, 5-9
Delete Users screen 4-4
Designated Bridge field 5-21
Designated Bridge Port 5-14
Designated Cost field 5-21
designated downlink port. See backbone port
Designated Port field 5-20
Designated Root field 5-18, 5-21
Destination field 4-29
Device IP Address field 3-10
Device Subnet Mask field 3-10
Disable Interactive Access field 4-13
Downlink Module. See Plug-in Module
downlink port. See backbone port
DSR Control field 4-25
Duplex Mode field 4-11, 4-14
E
Edit User screen 4-5
Ethernet address, location on the unit 1-13
Events (RMON group) 5-24
F
Falling Action field 4-15
Falling Threshold% field 4-14
Fast Boot tests 3-9
Fast Ethernet configuration rules 2-2
Fast Start field 5-21
Fault Log screen 6-9
Fault Log, interpreting 6-9
fax service. See 3ComFacts
fields
Access Level 4-3
Active Port 4-21, 4-22
Auto Config 4-25
Backbone Port 4-11, 5-9
Backup VLAN Server IP Address 5-11
BOOTP Select 3-10
Bridge Forward Delay 5-19
Bridge Hello Time 5-19
Bridge Max Age 5-19
Bridge Priority 5-19
Bridging Mode 4-10
Broadcast Storm Control 4-14
Char Size 4-26
Community String 4-3, 4-5, 4-24
Community-SNMP 4-6
Confirm Password 4-5
Connection Type 4-25
Console Port 4-6
Data Link Protocol 3-10
DCD Control 4-25
Default RMON Host/Matrix 4-11
Default Router 3-10
Designated Bridge 5-21
Designated Cost 5-21
Designated Port 5-20
Designated Root 5-18, 5-21
Destination 4-29
Device IP Address 3-10
Device Subnet Mask 3-10
Disable Interactive Access 4-13
DSR Control 4-25
Duplex Mode 4-11, 4-14
Falling Action 4-15
Falling Threshold% 4-14
Fast Start 5-21
File Name 4-29
Flow Control 4-25
Forward Delay 5-19
Forwarding Mode 4-9
Fwd Transitions 5-21
Hello Time 5-18
Hold Time 5-19
Intelligent Flow Management 4-12
Intelligent Forwarding 4-9
IP or IPX Address 4-24
IPX Network 3-10
Link State 4-20
Lost Links 4-12
MAC Address 3-9, 4-17
MAIN Port 4-22
Main Port ID 4-20
Management Level 4-7
Max Age 5-18
New Password 4-5
Node 3-10
Old Password 4-5
PACE 4-10
Pair Enable 4-21, 4-23
Pair State 4-20, 4-22
Parity 4-26
Password 3-7, 4-3
Path Cost 5-21
Plug-in Module Type 4-11
Poll Period 5-11
Port Number 4-17
Port Speed 4-12
Port State 4-12
Power On Self Test Type 3-9
Power Supply 4-11
Priority 5-21
Remote Telnet 4-6
Rising Action 4-15
Rising Threshold% 4-14
Root Cost 5-18
Root Port 5-19
SDB Ageing Time 4-11
Security 4-13
Server Address 4-29
SLIP Address 3-10
SLIP Subnet Mask 3-10
Spanning Tree 4-11
Speed 4-26
INDEX
Standby Links Available 4-20
STANDBY Port 4-22
Standby Port ID 4-20
Stop Bit 4-26
STP State 5-20
sysName 4-9
System Up Time 6-8
Throttle 4-24, 5-11
Time Since Topology Change 5-19
Topology Changes 5-18
Transceiver Module Type 4-11
Type 5-8
Unit Name 4-9
User Name 3-7, 4-3
VLAN Configuration Mode 4-10, 4-14
VLAN ID 5-9, 5-18
VLAN Membership 5-9
VLAN Server Community String 5-11
VLAN Server IP Address 5-11
VLT Mode 4-13
File Name field 4-29
Filter (RMON group) 5-24
Flow Control field 4-25
Forward Delay field 5-19
forwarding 1-3
Forwarding Mode field 4-9
full duplex 1-4
configuration rules 2-2
enabling and disabling 4-11, 4-14
fuse, changing A-3
Fwd Transitions field 5-21
H
hardware version number 6-8
Hello BPDUs 5-15
Hello Time 5-14
Hello Time field 5-18
History (RMON group) 5-23
Hold Time field 5-19
Hosts (RMON group) 5-23
Hosts Top N (RMON group) 5-23
I
IFM. See Intelligent Flow Management
Initialization screen 4-28
initializing the Switch 4-28
installing the Switch 2-4
Intelligent Flow Management 1-4, 1-6
Intelligent Flow Management field 4-12
Intelligent Forwarding field 4-9
Intelligent Switching Mode 1-4
Interactive Access, disabling 4-13
IP address
default router 3-10
device 3-10
entering 1-15
format 3-2
IP or IPX Address field 4-24
IP protocol 1-14
IPX address 1-15
IPX Network field 3-10
IPX protocol 1-14
3
Main Menu screen 3-8
MAIN Port field 4-22
Main Port ID field 4-20
management agent version number 6-8
Management Level field 4-7
Management Setup screen 3-9
Matrix (RMON group) 5-24
Max Age 5-15
Max Age field 5-18
N
network configuration examples 1-6
network supplier support F-3
New Password field 4-5
Node field 3-10
non-ageing entries 4-16
non-routable protocols
limitation for VLAN-based networks 5-5
O
K
Old Password field 4-5
on-line technical services F-1
keyboard shortcuts 3-5
L
LEDs 1-11
line speed 4-26
Link State field 4-20
Local Security screen 4-6
logging off 3-12
logging on 3-7
Logon screen 3-7
Lost Links field 4-12
M
MAC Address field 3-9, 4-17
MAC address label 1-13
Main Banner screen 3-6
P
PACE 1-6
disabling Interactive Access for a port 4-13
PACE field 4-10
packets, processing 1-3
Pair Enable field 4-21, 4-23
Pair State field 4-20, 4-22
Parity field 4-26
Password field 3-7, 4-3
passwords
changing 4-5
default 3-7
forgetting 4-5
Path Cost field 5-21
path costs, default 5-14
4
INDEX
permanent entries 4-16
displaying 4-17
specifying 4-17, 4-18
pin assignments
modem cable D-2
null modem cable D-1
RJ45 D-2
serial cable D-1
pin-outs D-1
Plug-in Module 1-2, 1-13
Plug-in Module Type field 4-11
Poll Period field 5-11
port
100BASE-TX 1-2, 1-11
10BASE-T 1-2, 1-11
backbone 1-2, 5-8, 5-9
console 1-13
enabling and disabling 4-12
speed 4-12
state 4-12
statistics 6-3
Port Error Analysis screen 6-6
Port Number field 4-17
Port Resilience screen 4-20
Port Setup screen 4-12
Port Speed field 4-12
Port State field 4-12
Port Statistics screen 6-3
Port STP screen 5-20
Port Traffic Statistics screen 6-4
Port VLAN Mode 5-3
Power On Self Test Type field 3-9
power supply 1-13
Power Supply field 4-11
powering up 2-6
Priority field 5-21
problem solving C-1
Q
quick start for SNMP users 1-15
R
S
rack mounting 2-4
Redundant Power System. See RPS
Remote Monitoring. See RMON
Remote Poll screen 6-10
remote polling 6-10
Remote Telnet field 4-6
reset
time since last 6-8
reset button 1-13
Reset screen 4-27
resets
number of 6-8
type 6-8
resetting the Switch 4-27
resilient link pair 4-19
resilient links 1-5
configuring 4-20
creating 4-21
deleting 4-21
rules 4-19
setting up 4-19
viewing 4-22
returning products for repair F-4
Rising Action field 4-15
Rising Threshold% field 4-14
RMON 5-22
alarm actions 5-28
benefits 5-25
default alarm settings 5-29
enabling and disabling Hosts and
Matrix 4-11
features supported 5-26
groups supported 5-26
probe 5-22
Root Bridge 5-14
Root Cost field 5-18
Root Path Cost 5-14
Root Port field 5-19
RPS 1-13
connecting 2-6
safety information
English A-1
French A-4
German A-7
screens 4-1
access rights B-1
Auto Logout 3-12
Console Port Setup 4-25
Create User 4-3
Delete Users 4-4
Edit User 4-5
Fault Log 6-9
Initialization 4-28
Local Security 4-6
Logon 3-7
Main Banner 3-6
Main Menu 3-8
Management Setup 3-9
Port Error Analysis 6-6
Port Resilience 4-20
Port Setup 4-12
Port Statistics 6-3
Port STP 5-20
Port Traffic Statistics 6-4
Remote Poll 6-10
Reset 4-27
Software Upgrade 4-29
Status 6-8
Summary Statistics 6-2
Switch Management 4-7
Trap Setup 4-24
Unit Database View 4-17
Unit Resilience Summary 4-22
Unit Setup 4-9
User Access Levels 4-2
VLAN Server 5-11
VLAN Setup 5-8
VLAN STP 5-18
SDB Ageing Time field 4-11
security 1-5
Security field 4-13
serial number, location on unit 1-13
INDEX
serial port. See console port
Server Address field 4-29
servers, connecting 1-6
SLIP Address field 3-10
SLIP Subnet Mask field 3-10
SNMP 1-14, 3-6
Community 4-6
quick start 1-15
socket
power 1-13
RPS 1-13
Software Upgrade screen 4-29
software version number 6-8
Spanning Tree field 4-11
Spanning Tree Protocol. See STP
specifications, system E-1
Speed field 4-26
standards supported E-2
Standby Links Available field 4-20
STANDBY Port field 4-22
Standby Port ID field 4-20
statistics 6-1
counters. See counters
port 6-3
port error 6-6
port traffic 6-4
summary 6-2
Statistics (RMON group) 5-23
Status screen 6-8
Stop Bit field 4-26
STP 1-5, 5-12
Bridge Identifier 5-14
Bridge Protocol Data Units 5-14
configurations 5-16
configuring port properties 5-20
configuring VLAN properties 5-18
default path costs 5-14
Designated Bridge Port 5-14
enabling and disabling 4-11, 5-17
Hello BPDUs 5-15
Hello Time 5-14
Max Age 5-15
Root Bridge 5-14
Root Path Cost 5-14
STP State field 5-20
subnet mask, device 3-10
Summary Statistics screen 6-2
Switch 1000 1-1
desktop configuration 1-9
dimensions E-1
features 1-1
front view 1-10
initializing 4-28
installing 2-4
LEDs 1-11
logging off 3-12
logging on 3-7
management setup 3-9
port setup 4-12
positioning 2-1
powering up 2-6
rack mounting 2-4
rear view 1-12
resetting 4-27
size E-1
stacking with other units 2-4
unit defaults 1-14
unit setup 4-9
upgrading software 4-29
wall mounting 2-5
weight E-1
workgroup configuration 1-7, 1-8
Switch Database 4-16
adding an entry 4-18
ageing entries 4-16
configuring 4-17
deleting an entry 4-18
non-ageing entries 4-16
permanent entries 4-16
searching 4-18
traps 4-16
Switch Management screen 4-7
sysName field 4-9
system specifications E-1
System Up Time field 6-8
T
technical support F-1
3Com URL F-1
Bulletin Board Service F-1
fax service F-2
network suppliers F-3
product repair F-4
using CompuServe F-2
Telnet 3-2, 4-6
terminal emulator, connecting 2-7
terminal, connecting 2-7
Throttle field 4-24, 5-11
time since reset 6-8
Time Since Topology Change field 5-19
Topology Changes field 5-18
Transceiver Module 1-2, 1-13
Transceiver Module Type field 4-11
Trap Setup screen 4-24
traps
community strings 4-24
setting up 4-24
throttle 4-24
trouble-shooting C-1
Type field 5-8
U
Unit Database View screen 4-17
Unit Name field 4-9
Unit Resilience Summary screen 4-22
Unit Setup screen 4-9
upgradable software version number 6-8
upgrading software 4-29
URL F-1
User Access Levels screen 4-2
User Name field 3-7, 4-3
users
access levels 4-6
changing names 4-5
creating 4-3
default 3-7
deleting 4-4
5
6
INDEX
editing 4-5
setting up 4-2
Z
zeroing screen counters 6-2, 6-5, 6-7
V
version number
boot software 6-8
hardware 6-8
upgradable software 6-8
Virtual LAN Trunks. See VLTs
Virtual LANs. See VLANs
VLAN Configuration Mode field 4-10, 4-14
VLAN ID field 5-9, 5-18
VLAN Membership field 5-9
VLAN server 5-3
VLAN Server Community String field 5-11
VLAN Server IP Address field 5-11
VLAN Server screen 5-11
VLAN Setup screen 5-8
VLAN STP screen 5-18
VLANs 1-5, 5-1
assigning ports 5-10
AutoSelect VLAN Mode 5-3
Default 5-3, 5-9
extending into an ATM network 5-5
Port VLAN Mode 5-3
setting up 5-8
using non-routable protocols 5-5
using unique MAC addresses 5-5
VLTs 5-8
VLT Mode field 4-13
VLTs 5-3, 5-8
VT100 interface
accessing 3-1
definition 1-14
logging on 3-7
navigating 3-4
VT100 terminal, connecting 2-7
W
wall mounting 2-5
World Wide Web (WWW) F-1
3Com Corporation
LIMITED WARRANTY
within the warranty period. Products returned to 3Com’s Corporate Service Center must
be pre-authorized by 3Com with a Return Material Authorization (RMA) number marked
on the outside of the package, and sent prepaid, insured, and packaged appropriately for
safe shipment. The repaired or replaced item will be shipped to Customer, at 3Com’s
expense, not later than thirty (30) days after receipt of the defective product by 3Com.
HARDWARE
3Com warrants its hardware products to be free from defects in workmanship and
materials, under normal use and service, for the following lengths of time from the date
of purchase from 3Com or its Authorized Reseller:
Network adapters
Lifetime
Other hardware products (unless otherwise specified above)
1 year
Spare parts and spare kits
90 days
If a product does not operate as warranted above during the applicable warranty period,
3Com shall, at its option and expense, repair the defective product or part, deliver to
Customer an equivalent product or part to replace the defective item, or refund to
Customer the purchase price paid for the defective product. All products that are
replaced will become the property of 3Com. Replacement products may be new or
reconditioned. Any replaced or repaired product or part has a ninety (90) day warranty or
the remainder of the initial warranty period, whichever is longer.
WARRANTIES EXCLUSIVE
IF A 3COM PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE, CUSTOMER’S SOLE
REMEDY FOR BREACH OF THAT WARRANTY SHALL BE REPAIR, REPLACEMENT, OR
REFUND OF THE PURCHASE PRICE PAID, AT 3COM’S OPTION. TO THE FULL EXTENT
ALLOWED BY LAW, THE FOREGOING WARRANTIES AND REMEDIES ARE EXCLUSIVE AND
ARE IN LIEU OF ALL OTHER WARRANTIES, TERMS, OR CONDITIONS, EXPRESS OR
IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW, STATUTORY OR OTHERWISE,
INCLUDING WARRANTIES, TERMS, OR CONDITIONS OF MERCHANTABILITY, FITNESS FOR
A PARTICULAR PURPOSE, AND SATISFACTORY QUALITY. 3COM NEITHER ASSUMES NOR
AUTHORIZES ANY OTHER PERSON TO ASSUME FOR IT ANY OTHER LIABILITY IN
CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE, OR USE OF ITS
PRODUCTS.
3Com shall not be responsible for any software, firmware, information, or memory data
of Customer contained in, stored on, or integrated with any products returned to 3Com
for repair, whether under warranty or not.
3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND
EXAMINATION DISCLOSE THAT THE ALLEGED DEFECT IN THE PRODUCT DOES NOT EXIST
OR WAS CAUSED BY CUSTOMER’S OR ANY THIRD PERSON’S MISUSE, NEGLECT,
IMPROPER INSTALLATION OR TESTING, UNAUTHORIZED ATTEMPTS TO REPAIR OR
MODIFY, OR ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE, OR BY
ACCIDENT, FIRE, LIGHTNING, OR OTHER HAZARD.
SOFTWARE
LIMITATION OF LIABILITY
3Com warrants that the software programs licensed from it will perform in substantial
conformance to the program specifications therefor for a period of ninety (90) days from
the date of purchase from 3Com or its Authorized Reseller. 3Com warrants the media
containing software against failure during the warranty period. No updates are provided.
3Com’s sole obligation with respect to this express warranty shall be (at 3Com’s
discretion) to refund the purchase price paid by Customer for any defective software
products, or to replace any defective media with software which substantially conforms
to 3Com’s applicable published specifications. Customer assumes responsibility for the
selection of the appropriate applications program and associated reference materials.
3Com makes no warranty or representation that its software products will work in
combination with any hardware or applications software products provided by
third-parties, that the operation of the software products will be uninterrupted or error
free, or that all defects in the software products will be corrected. For any third-party
products listed in the 3Com software product documentation or specifications as being
compatible, 3Com will make reasonable efforts to provide compatibility, except where
the noncompatibility is caused by a “bug” or defect in the third-party’s product.
TO THE FULL EXTENT ALLOWED BY LAW, 3COM ALSO EXCLUDES FOR ITSELF AND ITS
SUPPLIERS ANY LIABILITY, WHETHER BASED IN CONTRACT OR TORT (INCLUDING
NEGLIGENCE), FOR INCIDENTAL, CONSEQUENTIAL, INDIRECT, SPECIAL, OR PUNITIVE
DAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE OR PROFITS, LOSS OF BUSINESS,
LOSS OF INFORMATION OR DATA, OR OTHER FINANCIAL LOSS ARISING OUT OF OR IN
CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE, USE, PERFORMANCE,
FAILURE, OR INTERRUPTION OF ITS PRODUCTS, EVEN IF 3COM OR ITS AUTHORIZED
RESELLER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, AND LIMITS ITS
LIABILITY TO REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT
3COM’S OPTION. THIS DISCLAIMER OF LIABILITY FOR DAMAGES WILL NOT BE AFFECTED
IF ANY REMEDY PROVIDED HEREIN SHALL FAIL OF ITS ESSENTIAL PURPOSE.
STANDARD WARRANTY SERVICE
GOVERNING LAW
Standard warranty service for hardware products may be obtained by delivering the
defective product, accompanied by a copy of the dated proof of purchase, to 3Com’s
Corporate Service Center or to an Authorized 3Com Service Center during the applicable
warranty period. Standard warranty service for software products may be obtained by
telephoning 3Com’s Corporate Service Center or an Authorized 3Com Service Center,
This Limited Warranty shall be governed by the laws of the state of California.
Some countries, states, or provinces do not allow the exclusion or limitation of implied
warranties or the limitation of incidental or consequential damages for certain products
supplied to consumers or the limitation for personal injury, so the above limitations and
exclusions may be limited in their application to you. This warranty gives you specific
legal rights which may vary depending on local law.
3Com Corporation, 5400 Bayfront Plaza, Santa Clara, CA 95052-8145
(1) (408) 764-5000
9/1/96
ELECTRO-MAGNETIC COMPATIBILITY
FCC STATEMENT
This equipment has been tested with a class A computing device and has been found to
comply with part 15 of FCC Rules. Operation in a residential area may cause
unacceptable interference to radio and TV receptions, requiring the operator to take
whatever steps are necessary to correct the interference.
CSA STATEMENT
This Class A digital apparatus meets all requirements of the Canadian
interference-Causing Equipment Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le
matériel brouilleur du Canada.
VCCI STATEMENT
INFORMATION TO THE USER
If this equipment does cause interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:
■
Reorient the receiving antenna.
■
Relocate the equipment with respect to the receiver.
■
Move the equipment away from the receiver.
■
Plug the equipment into a different outlet so that equipment and receiver are
on different branch circuits.
If necessary, the user should consult the dealer or an experienced radio/television
technician for additional suggestions. The user may find the following booklet prepared
by the Federal Communications Commission helpful:
How to Identify and Resolve Radio-TV Interference Problems
This booklet is available from the U.S. Government Printing Office, Washington, DC
20402, Stock No. 004-000-00345-4.
In order to meet FCC emissions limits, this equipment must be used only with cables
which comply with IEEE 802.3.
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