Accton Technology 12mi User's Manual

Accton Technology 12mi User's Manual
Fast EtherHub 3500 System
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Installation and User’s Guide
Fast EtherHub 3500 System
Intelligent
Fast Ethernet Stackable Hub
with 12 100BASE-TX Ports;
including SNMP Management Support
Copyright (c) 1996 by Accton Technology Corporation. All rights reserved.
No part of this document may be copied or reproduced in any form or by any means without the prior written
consent of Accton Technology Corporation.
Accton makes no warranties with respect to this documentation and disclaims any implied warranties of
merchantability, quality, or fitness for any particular purpose. The information in this document is subject to change
without notice. Accton reserves the right to make revisions to this publication without obligation to notify any person
or entity of any such changes.
Before operating this product, please review the statements on electomagnetic emission interference and safety
compliance in Appendix D.
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No. 1 Creation Road III,
Science-based Industrial Park
Hsinchu 300, Taiwan, R.O.C.
Phone: 886-3-5770-270
FAX: 886-3-5770-267
BBS: 886-3-5770-654
Internet: [email protected]
1962 Zanker Road
San Jose, CA 95112
Phone: 408-452-8900
FAX: 408-452-8988
BBS: 408-452-8828
FAST FAX: 408-452-8811
Accton, EtherHub, SmartWatch, SmartExtender and AccView and are trademarks or registered trademarks of
Accton Technology Corporation. Other trademarks or brand names mentioned herein are trademarks or registered
trademarks of their respective companies.
EH3512I-TX
EH3512M-TX
E1296-R01
150136-101
Package Contents
Carefully unpack the contents of the package and verify them
against the checklist given below. This checklist applies to all
the Fast EtherHub 3500 Series models unless otherwise specified.
Package Checklist
æ Fast EtherHub-12i
Intelligent Fast Ethernet Stackable Hub with 12 100BASE-TX Ports
(Model No. EH3512I-TX)
or Fast EtherHub-12mi SNMP
Intelligent Fast Ethernet Stackable Hub with 12 100BASE-TX Ports;
including SNMP Managment Support
(Model No. EH3512M-TX)
æ Two mounting brackets
æ Four rubber foot pads
æ One AC power cord
æ One 20 cm FlexBus 3500 stack cable
æ Installation manual
æ Owner registration card
@
Please inform your dealer immediately should there be any
wrong, missing, or damaged parts.
If possible, retain the carton, including the original packing
materials. Use them again to repack the unit in case there is a
need to return it for repair.
To qualify for product updates and product warranty
registration, fill in the Owner Registration Card and return it
to Accton Technology Corporation.
Package Contents
i
Quick Installation
Accton’s Fast EtherHub 3500 models each contain 12 Fast
Ethernet (100BASE-TX) RJ-45 ports, one MDI daisy-chain port,
and one slot for an optional connection using 100BASE-TX
(10BASE-T), 100BASE-T4 or 100BASE-FX.
The smart design built into the front display panel and
configure options provide a friendly interface that simplifies
installation and network troubleshooting. If you are already
familiar with basic network operations, you should be able to
install this hub as described below:
1. Unpack the Fast EtherHub 3500 unit.
2. Find a location close to the network devices you need to
connect, and within easy reach of an electrical outlet.
These hubs are suitable for
desktop or rack mounting
3. Mount the hub on a desktop or any other flat surface. If you
are installing multiple hubs, you can stack them on top of
each other (after attaching the foot pads), or install them in a
standard EIA 19-inch rack.
Attach PCs to the station ports
4. Connect any devices that use a standard network interface
to the RJ-45 (MDI-X) station ports (e.g., a workstation,
server or router). Use 100W Category 5 unshielded twistedpair (UTP) or 100W shielded twisted-pair (STP) cable. Also
be sure that the length of any twisted-pair connection does
not exceed 100 meters. (Refer to Chapter 2 for a more
detailed description of calculating the maximum cable length
permitted between two end nodes.)
Attach each hub in the stack
with FlexBus 3500 stack cable
5. If you are stacking multiple hubs, connect the FlexBus 3500
stack cable between the “Out” and “In” backplane ports on
adjacent hubs. Run a simple chain starting at the Out port on
the top hub in the stack, and ending at the In port on the
bottom hub in the stack. No more than 6 hubs can be
connected via the backplane bus.
Quick Installation
iii
Fast EtherHub 3500 System User’s Guide
Attach each hub to one of the
backplane segments
Use the SmartExtender Module to
interconnect different segments in
the stack
Or interconnect the stack’s
segments by attaching the daisychain port to a switch, or the
station ports to a router
Attach to the extended network
via the daisy-chain port
6. Connect each hub to one of the 3 Fast Ethernet segments
embedded in the backplane bus using either on-board
configuration (Chapter 4) or optional network management
software (e.g., AccView/Open). You can leave a hub isolated
from the backplane if required for your network environment
(e.g., to restrict network access for the attached user group).
However, you should be careful to structure your network
connections so that nodes which communicate frequently are
located in the same segment. (Factory default is Segment 1.)
7. Bridge the different backplane segments in the Fast Ethernet
3500 stack by running a connection from the optional
100BASE-TX extender module on this hub to any station
port on another hub in the stack that has been assigned to a
different segment. Remember that devices connected to the
switching port exist in a separate segment (and unless also
connected to the FlexBus management channel) cannot be
controlled by a management agent in the stack. When
connecting a hub to the expansion port, the maximum cable
length is 100 meters.
8. If you do not have any available SmartExtender Modules,
the different segments in a Fast EtherHub 3500 stack can
also be combined into an interconnected network by running
a cable from the hubs’ daisy-chain ports (i.e., using port
12MDI on hubs attached to the different segments) to a
network interconnection device such a switch; or by running
a cable from the hubs’ station ports (i.e., using ports on hubs
attached to different segments) to a router.
9. You can also attach the overall stack to a network interconnection device via the daisy-chain port (when connecting to
a switch) or via a station port (when connecting to a router).
Run straight-through twisted-pair cable from the hub to the
other device. When attaching to a switch, run cable from the
MDI daisy-chain port on this hub to any (MDI-X) station
port on the switch (or vice versa).
Note: When using the 12MDI daisy-chain port, remember that port
12X cannot be used.
iv
Quick Installation
Fast EtherHub 3500 System User’s Guide
Or attach to the extended
network via the SmartExtender
Module
10. If an optional SmartExtender Module is installed in the
expansion port, it can be used to make a bridged connection
from this hub to another network device using 100BASE-TX
The SmartExtender Module can
(10BASE-T), 100BASE-T4 or 100BASE-FX media types.
be used to attach to another
When connecting a node to the expansion port, the maxinetwork device that uses a
different media type
mum cable length is 100 meters for twisted-pair cable, and 2
kilometers for fiber. (Refer to Chapter 2 for a more detailed
description of calculating the maximum length permitted for
fiber optic cable.)
Attach the SmartExtender Module
You can use the extender module to bridge this hub to
to a hub, switch, bridge or router
another Ethernet or Fast Ethernet hub or stack; or to attach it
to a network interconnection device, such as a switch, bridge
or router. However, when using the expansion port to cascade
to other networking devices outside the stack, note that the
maximum cascade length should be limited to 7 devices.
Transmission speed is automatically
For integrating legacy networks, the 100BASE-TX extender
set for any connection made to the
module provides for connection via either 100BASE-TX or
SmartExtender Module
10BASE-T. All 100BASE entender modules use auto-sensing
to set the transmission speed at 10 or 100 Mbps. In other words,
this module can correctly set the transmission speed for the
attached device, even if it does not support auto-negotiation.
Transmission mode automatically
The extender modules, except for 100BASE-T4, support both
configured for the connected device
half-duplex and full-duplex communications. However, for
only if it supports auto-negotiation
this hub to correctly set the transmission mode, the attached
device must also support auto-negotiation. If auto-negotiation
fails, the transmission mode defaults to half duplex. If this
setting is not suitable, then the transmission mode must be
manually configured via on-board configuration (Chapter 4)
or optional network management software (e.g., AccView/Open).
To reactivate auto-negotiation, just unplug a connection from
Use half duplex for a
the port on the hub and plug it in again. Remember that fullshared collision domain
duplex mode can only be used for a dedicated link, such as that
provided by the SmartExtender Module. When connecting to a
shared collision domain (i.e., another hub) set the transmission
mode for half duplex.
Quick Installation
v
Fast EtherHub 3500 System User’s Guide
Difference in connecting to the
extended network via the daisychain port or SmartExtenter Module
Check your connections
The Fast EtherHub 3500 stack can be connected to a larger
network using any device such as a switch, bridge or router.
Depending on your network configuration, you may attain
better performance by making a direct connection from the
daisy-chain port (or a station port) on this hub to an
interconnection device. Making a connection from an
extender module may introduce slightly more delay.
11. Verify network communications by ensuring that • you have made all the necessary connections
• you can access any connected resources
• the hub’s indicators are functioning properly
If you encounter any problems in installing the Fast EtherHub
3500 system, refer to Chapter 2 for a detailed description of
installation procedures, or to Appendix A for help in
troubleshooting.
vi
Quick Installation
About this Guide
This guide is designed for the experienced network installer.
It describes how to install and operate Accton’s Fast EtherHub
3500 system. After reading this manual, you should be able to
use the front display panel and configure options to manage all
your network connections.
This manual covers the following topics:
Chapter 1
- Product Overview
Brief description of Fast Ethernet, followed by a description of
this hub and a summary of its important features and
specifications.
Chapter 2
- Installing the System
Installing a Fast EtherHub 3500 and making basic network
connections. Also includes a description of significant
components on the hub including ports and indicators.
Chapter 3
- Setting up Network Connections
Shows sample network configurations for a local area network.
Chapter 4
- Configuring the System
Describes how to manage the system via the on-board
configuration program.
Chapter 5
- Hardware Reference
Detailed description of indicator panel and ports.
Appendices - Troubleshooting, cable assignments, and product specifications.
About this Guide
vii
Contents
Chapter 1: Product Overview
1-1
Introduction to Fast Ethernet
Brief Description of the Fast EtherHub 3500 System
Distinguishing Factors of Fast EtherHub 3500 System
Basic Features of Fast EtherHub 3500 System
Data Switching with the SmartExtender Modules
Switching Technology
Configuration Options for the SmartExtender Modules
Switching Methods
1-1
1-1
1-5
1-6
1-9
1-9
1-9
1-10
Chapter 2: Installing the System
2-1
Pre-Installation Requirements
Hardware Installation
Stacking Hubs without a Rack
Mounting Hubs in a Rack
Connecting the Hub System
Making a Connection via an MDI-X Station Port
Connecting to the Stack’s Backplane
Making a Connection via the MDI Daisy-Chain Port
Connecting to a SmartExtender Module
Installing a Backup Power Supply
Powering on the Hub
Diagnostic Tests
Hot Remove
Configuring a Manageable Stack
Installing an SNMP Backup Agent
Verifying Port Status
Verifying System Operation
2-1
2-2
2-2
2-3
2-4
2-4
2-5
2-6
2-6
2-11
2-12
2-12
2-13
2-14
2-14
2-15
2-15
Contents
ix
Fast EtherHub 3500 System User’s Guide
x
Chapter 3: Setting up Network Connections
3-1
Special Architecture Used for the Fast EtherHub 3500 Stack
Multi-Segment Architecture
FlexBus Management Link
Hub ID Setting
Using Management Agents
Port Backup Function
Security Features
Sample Network Configurations
Attaching the Stack to One Segment
Attaching the Stack to Multiple Segments
Isolating Specific Hub Connections
Isolating Each Hub
Extending the Network with Alternate Connections
Linking the Stack to a Management Station
Interconnecting the Segments
Connecting Remote Stacks
Operating in the Novell NetWare IPX Environment
Operating in the TCP/IP Environment
Connecting to the Network Backbone
3-1
3-1
3-2
3-2
3-2
3-4
3-4
3-5
3-5
3-6
3-7
3-8
3-9
3-10
3-11
3-12
3-13
3-14
3-15
Chapter 4: Configuring the System
4-1
Making the Connections Required for System Configuration
Direct Connection
Network Connection
Local In-Band Telnet Connection
Local In-Band Network Connection
Remote Connection
Configuring the Fast EtherHub Site
Configuring the Remote Site
Remote Configuration Methods
Accessing the Configuration Management Program
Configuring Your System with the On-board Program
Using the Fast EtherHub 3500 System Configuration Program
System Configuration Program for the Fast EtherHub-12i
Configuring the SmartExtender Port
4-1
4-2
4-2
4-3
4-3
4-4
4-4
4-4
4-4
4-5
4-5
4-7
4-8
4-9
Contents
Fast EtherHub 3500 System User’s Guide
System Configuration Program for the 12mi and Stack
Exiting the Configuration Program
Restarting the Agent
Displaying System Information
Configuring the SNMP Agent
Configuring SNMP Communities
Configuring IP Trap Managers
Configuring IPX Trap Managers
Changing the Segment Configuration
Configuring Hub Parameters
Configuring Port Parameters
Defining Backup Ports
Port Intrusion Control
Downloading System Software via a TFTP Server
Xmodem Download
Changing User Passwords
Console Lockout
Segment Statistics
Hub Statistics
Port Statistics
4-11
4-12
4-13
4-14
4-15
4-16
4-17
4-18
4-19
4-21
4-25
4-29
4-30
4-32
4-34
4-35
4-36
4-37
4-38
4-39
Chapter 5: Hardware Reference
5-1
Indicator Panel
Power Indicator
SmartExtender Module Indicator
Interhub
SNMP
Segment Indicators
Management Agent Indicators
Hub ID Indicator
Serial
Terminator
Isolation
Utilization Indicators
Collision Indicators
Port Status Indicators
Diagnostic Test Indicators
5-2
5-2
5-2
5-3
5-4
5-4
5-5
5-5
5-6
5-7
5-7
5-7
5-8
5-10
5-11
Contents
xi
Fast EtherHub 3500 System User’s Guide
Network Connections
Station Ports
Daisy-Chain Port
Serial Port
Rear Panel Components
Power Supply Modules
FlexBus Ports
In
Out
5-13
5-13
5-13
5-14
5-15
5-15
5-16
5-16
5-16
Appendix A: Troubleshooting
A-1
Diagnosing Hub Indicators
System Diagnostics
Power and Cooling Problems
Installation
Physical Configuration
System Integrity
A-1
A-2
A-2
A-2
A-4
A-4
Appendix B: Pin Assignments
RJ-45 Port
DB9 Serial Port Pin Description
Hub’s 9-Pin Serial Port to PC’s 9-Pin COM Port
Hub’s 9-Pin Serial Port to PC’s 25-Pin DTE Port
Hub’s 9-Pin Serial Port to Modem’s 25-Pin DCE Port
Appendix C: Product Specifications
xii
B-1
B-1
B-2
B-3
B-4
B-5
C-1
Product Specifications
C-1
Appendix D: Regulatory Standards
D-1
EMI Warning
FCC Class A Certification
Voluntary Control Council for Interference (VCCI-1)
EN55022 Declaration of Conformance
CE Mark Declaration of Conformance
Safety Compliance
D-1
D-1
D-2
D-3
D-3
D-4
Contents
Fast EtherHub 3500 System User’s Guide
Underwriters Laboratories Compliance Statement
Sicherheitshinweise
Appendix E: Product Support Services
Product Registration
Problem Report
Hardware Repair Service
Software Update and Upgrade Service
Bulletin Board Service (BBS)
Interactive Fast Fax (U.S.A. office)
Technical Support
Limited Warranty
Customer Remedies
Return Process
Accton Offices
Ordering Information
D-4
D-5
E-1
E-1
E-1
E-1
E-2
E-2
E-3
E-3
E-4
E-4
E-5
E-6
E-7
Glossary
Index
Contents
xiii
Fast EtherHub 3500 System User’s Guide
List of Figures
Figure 2-1
Figure 2-2
Figure 3-1
Figure 3-2
Figure 3-3
Figure 3-4
Figure 3-5
Figure 3-6
Figure 3-7
Figure 3-8
Figure 3-9
Figure 3-10
Figure 3-11
Figure 4-1
Figure 4-2
Figure 4-3
Figure 4-4
Figure 4-5
Figure 4-6
Figure 4-7
Figure 4-8
Figure 4-9
Figure 4-10
Figure 4-11
Figure 4-12
Figure 4-13
Figure 4-14
Figure 4-15
Figure 4-16
Figure 4-17
Figure 4-18
Figure 4-19
Figure 4-20
Figure 4-21
Figure 4-22
Figure 4-23
Figure 4-24
xiv
Contents
Stacking Hubs without a Rack
Mounting Hubs Using a Mounting Rack
Attaching All Hubs in Stack to One Segment
Attaching Hubs in Stack to Three Segments
Linking Part of the Stacked Hubs to a Segment
Stacked Hubs Not Linked to a Segment
Linking Stacked Hubs to Unmanaged Hubs
Linking Stacked Hubs to an NMS
Linking Segments in a Stacked System
Connecting Remote Stacks
System Applied in Novell NetWare IPX Environment
System Applied in TCP/IP Environment
Connecting to the Network Backbone
Main Configuration Menu (12i only)
Configuration Menu for Extender Module (12i only)
Main Configuration Menu
Screen Messages for System Resart
System Information Menu
SNMP Configuration Menu
SNMP Communities Menu
IP Trap Managers Menu
IPX Trap Managers Menu
Segment Configuration Menu
Hub Configuration: Hub Selection Menu
Hub Configuration Menu
Hub ID Configuration Menu
Port Configuration: Port Selection Menu
Port Configuration Menu
SEM Port Configuration Menu
Port Backups Menu
Port Intrusion Control: Hub Selection Menu
Port Intrusion Control Menu
TFTP Download Menu
Xmodem Download Menu
User Passwords Menu
Console Lockout Menu
Segment Statistics Window
2-2
2-3
3-5
3-6
3-7
3-8
3-9
3-10
3-11
3-12
3-13
3-14
3-15
4-8
4-9
4-11
4-13
4-14
4-15
4-16
4-17
4-18
4-19
4-21
4-22
4-24
4-25
4-26
4-27
4-29
4-30
4-31
4-32
4-34
4-35
4-36
4-37
Fast EtherHub 3500 System User’s Guide
Figure 4-25
Figure 4-26
Figure 4-27
Figure 4-28
Figure 4-29
Figure 5-1
Figure 5-2
Figure 5-3
Figure B-1
Figure B-2
Hub Statistics: Hub Selection Menu
Hub Statistics Window
Port Statistics: Port Selection Menu
Port Statistics Menu
SEM Port Statistics Menu
Front Panel of EtherHub-12mi
Indicators for EtherHub-12mi
Rear Panel
RJ-45 Connector (on the Hub Side)
DB9 Serial Port (on the Hub Side)
4-38
4-38
4-39
4-40
4-42
5-1
5-2
5-15
B-1
B-2
List of Tables
Table 2.1
Table 2.2
Table 2.3
Table 2.4
Table 2.5
Table 4.1
Table 4.2
Table 4.3
Table 4.4
Table 4.5
Table 4.6
Table 4.7
Table 4.8
Table 4.9
Table 4.10
Table 4.11
Table 4.12
Table 4.13
Table 4.14
Table 4.15
Table 4.16
Table 4.17
Table 4.18
Table 4.19
Table 4.20
Table 4.21
Contents
Calculating the Power Budget for Fiber Optics
Power Budget for Common Guage Fiber Optics
Diagnostic Test Functions
Checking Key LED Indicators
Maximum Cable Length
Configuration Options in Main Menu (12i only)
Configuration Options for Extender Module (12i only)
Main Configuration Menu
System Information Menu
SNMP Configuration Menu
SNMP Communities Menu
IP Trap Managers Menu
IPX Trap Managers Menu
Segment Configuration Menu
Hub Configuration Menu
Port Configuration Menu
SEM Port Configuration Menu
Port Backups Menu
Port Intrusion Control Menu
TFTP Download Menu
Xmodem Download Menu
User Passwords Menu
Console Lockout Menu
Segment Statistics Menu
Hub Statistics Menu
Port Statistics Menu
2-8
2-9
2-13
2-15
2-16
4-9
4-10
4-12
4-14
4-15
4-16
4-17
4-18
4-20
4-23
4-26
4-28
4-30
4-31
4-33
4-34
4-35
4-36
4-37
4-39
4-41
xv
Fast EtherHub 3500 System User’s Guide
Table 4.22
Table 5.1
Table 5.2
Table 5.3
Table 5.4
Table 5.5
Table 5.6
Table 5.7
Table 5.8
Table 5.10
Table 5.11
Table 5.12
Table 5.13
Table 5.14
Table 5.15
Table 5.16
Table 5.17
Table B.1
Table B.2
Table B.3
Table B.4
Table B.5
Table B.6
Table B.7
Table E.1
T
xvi
Contents
SEM Port Statistics Menu
Power Indicator
SmartExtender Module Indicator
SmartExtender Module Indicators
Interhub Indicator
SNMP Indicator
Management Agent Indicators
Hub Indicators
Serial Indicator
Terminator Indicator
Isolation Indicator
Utilization Indicators
Collision Indicators
Partition/Disable Indicators
Link/Traffic Indicators
Diagnostic Indicators
Diagnostic Results
RJ-45 Pin Assignments
DB9 Port Pin Assignments
Full-Pin Connection from
Hub’s 9-Pin Serial Port to PC’s 9-Pin COM Port
Three-Pin Connection from
Hub’s 9-Pin Serial Port to PC’s 9-Pin COM Port
Full-Pin Connection from
Hub’s 9-Pin Serial Port to PC’s 25-Pin DTE Port
Three-Pin Connection from
Hub’s 9-Pin Serial Port to PC’s 25-Pin DTE Port
Hub’s 9-Pin Serial Port to
Modem’s 25-Pin DCE Port Pin Assignments
Parameters for SmartExtender Modules
4-42
5-2
5-2
5-3
5-3
5-4
5-5
5-6
5-6
5-7
5-7
5-7
5-8
5-9
5-10
5-11
5-12
B-1
B-2
B-3
B-3
B-4
B-4
B-5
E-7
Chapter 1:
Product Overview
Introduction to Fast Ethernet
Standard 10 Mbps Ethernet has served well for past generations
of 80286 and 80386 machines performing simple file transfers.
However, with the inevitable growth in corporate network size
and the introduction of fully-functional 32-bit PC architectures,
and operating systems running complex applications, 10 Mbps
Ethernet has become a serious bottleneck.
With the recent flood of choices for upgrading media
bandwidth, 100 Mbps Fast Ethernet has become the most
popular choice because of its low cost, compatibility with
existing Ethernet applications, and the fact that it can run on top
of an installed base of twisted-pair cabling.
Moreover, by using a dual-speed switch (10 or 100 Mbps),
Fast Ethernet can be easily integrated into an existing 10 Mbps
Ethernet environment with no need for protocol translation or
changes to network software. It also includes specifications for
a media-independent interface (MII), which permits a switched
connection to any of the 100BASE-T sublayers; i.e., 100BASETX (10BASE-T), 100BASE-FX or 100BASE-T4.
Brief Description of the Fast EtherHub 3500 System
The EtherHub 3500 System is a powerful and innovative LAN
network enhancement and management product series. Each
component in the system supports a Fast Ethernet multi-segment
bus architecture that enhances traffic management and network
bandwidth utilization. This system offers the network manager
a wide range of flexible configuration options, allowing you to
increase your network’s bandwidth tenfold or more. In addition,
the entire installation can be monitored and controlled via SNMP
protocol through any network management station.
Product Overview
1-1
Fast EtherHub 3500 System User’s Guide
Moreover, the Fast EtherHub 3500 System provides advanced
network security features including “Intrusion Protection”
which ensures that only designated workstations are able to
transmit packets onto the network. Management access via the
out-of-band serial port or in-band via telnet is also password
protected.
The basic components of this network system include:
Full Connectivity
• Provides 12 RJ-45 (MDI-X) 100BASE-TX Fast Ethernet
(shielded) station ports for connecting devices to the network
using straight-through shielded or unshielded twisted-pair
cable (100W Cat 5 UTP or 100WSTP)
• 1 RJ-45 (MDI) daisy-chain port for connection to a switching
hub, eliminating the need for crossover cables
• 1 slot for optional SmartExtender Modules which provide a
connection to 100BASE-TX (10BASE-T), 100BASE-T4 or
100BASE-FX via a switching port
• A multi-segment bus architecture that enhances traffic
management and network bandwidth utilization
• 2 FlexBus ports for connecting to other hubs in a Fast
EtherHub 3500 stack via FlexBus 3500 stack cable
• On-board management via the RS232 serial port connected
directly to a terminal, or to a local or remote computer (that
provides a standard RS232 port)
The specific components are the:
Fast EtherHub-12i
Intelligent Fast Ethernet Stackable Hub with 12 100BASE-TX Ports
The Fast EtherHub-12i conforms to the IEEE 802.3u repeater
specification. It also serves as an intelligent hub which collects
port statistics and records events for system administration. Basic
configuration is provided by the on-board configuration program.
1-2
Product Overview
Fast EtherHub 3500 System User’s Guide
This hub can be used in a stand-alone configuration to form a
simple Fast Ethernet LAN networking 2 to 12 computers using
the RJ-45 station ports. Further network expansion can be
achieved using the embedded tri-segment backplane, the MDI
daisy-chain port, or one of the optional SmartExtender Modules.
Moreover, when stacked with other intelligent hubs through the
FlexBus ports and connected to the Fast EtherHub-12mi SNMP
management device, it can be monitored and controlled through
in-band or out-of-band channels.
Fast EtherHub-12mi SNMP
Intelligent Fast Ethernet Stackable Hub with 12 100BASE-TX Ports;
including SNMP Managment Support
This model conforms to both the IEEE 802.3u repeater
specification and the Simple Network Management Protocol
(SNMP). It not only functions as a 12-port Fast Ethernet
repeater, but also provides an on-board SNMP-based network
management agent for monitoring and controlling various
network components. It can monitor up to 6 intelligent hubs
connected to the same stack (including itself) through the
FlexBus port connection. This Fast EtherHub provides SNMP
management for the connected stack via various Management
Information Bases (MIBs), including MIB II, repeater MIB, and
Accton’s private MIB.
SmartExtender Module • 100BASE-TX (EM3551-TX)
Provides two RJ-45 ports, both of which can be connected to
10BASE-T or 100BASE-TX media types. Transmission
speed is automatically set to 10 or 100 Mbps via autosensing, and half or full duplex via auto-negotiation.
• 100BASE-T4 (EM3551-T4)
Provides two RJ-45 ports for 100BASE-T4 connection.
Transmission speed is automatically set to 10 or 100 Mbps
Product Overview
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Fast EtherHub 3500 System User’s Guide
via auto-sensing. Transmission mode for 100BASE-T4 is
fixed at half duplex.
• 100BASE-FX (EM3551-FX-SC or EM3551-FX-ST)
Provides two SC or ST type connectors for 100BASE-FX
connection. Transmission mode is automatically set to half
or full duplex via auto-negotiation. Transmission speed is
fixed at 100 Mbps.
Power Module Power Module (EM3550-PWR)
Slide-in power module for use in the slots on the back of hub.
When using two modules, the load is shared equally between
both, reducing the chance of failure, but still providing backup
power in case either module should fail.
In-Band Network Managment Software AccView/Open (SW6102)
This Windows-based network management software package
analyzes and displays data received from the Fast EtherHub
3500 system. This package allows the network supervisor to
access information from and set parameters for any hub in stack
by transmiting commands to the appropriate management agent.
AccView should be installed on the network management
station designated to manage the Fast EtherHub 3500 stack.
The workstation may communicate with the stack via a network
connection or from a remote site using SLIP run over TCP/IP.
If segmented architecture is used, the network management
station should be connected to the same segment as the SNMP
management agent (i.e., Fast EtherHub-12mi).
The minimal configuration for network management station
includes a 386 workstation with 10MB of available space on
the hard drive, 2 MB on-board memory, a VGA display, and
Windows version 3.1 or higher.
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Distinguishing Factors of Fast EtherHub 3500 System
This system provides the following key features:
• Provides multi-segment architecture allowing the network to
be split into three segments
• Supports fault-tolerant configuration by allowing port link
backup and agent backup
• Supports management functions via SNMP
• Supports on-board management (using Accton’s proprietary
Fast EtherHub 3500 System Configuration Program), and full
software configurable in-band management using the optional
AccView/Open (network management software)
• The on-board management agents support nearly any network
environment by providing management options via SNMP/IP,
SNMP/IPX and SNMP/Ethernet
• Provides extensive security features including port intrusion
protection, as well as password protection for out-of-band
access or in-band telnet access
• Supports redundant power supply
Product Overview
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Fast EtherHub 3500 System User’s Guide
Basic Features of Fast EtherHub 3500 System
In addition to all the features mentioned above, the system provides:
Basic Repeater Functions
• Repeats all incoming frames to the connected segment
• Automatically partitions and reconnects devices which
experience excessive collisions
• Jabber lockup protection provided by disabling any port that
receives 64 Kbytes of continues data, and re-enabling the port
after the condition improves
Outstanding Performance
• Total bandwidth of up to 300 Mbps
• The backplane contains 3 separate Ethernet segments, and
a high-speed management channel
• Manages up to 6 concentrators using the FlexBus stack cable
Extensive Management
Capabilities
• An extensive indicator panel for reporting network activity,
and unit configuration, and for facilitating problem diagnosis
• Menu-driven configuration program can be accessed via a
local or remote terminal connection to the hub’s serial port
• The Fast EtherHub model with the SNMP agent supports
in-band network management using optional network
management software such as Accton’s AccView/Open (not
included with this package) to monitor and control a stacked
system
• Provides one serial 9-pin RS232 port for out-of-band or
remote in-band network management
• BOOTP support for dynamic address assignment
• Flash ROM on board the Fast EtherHub-12mi models for
easily updating the SNMP agent
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• Firmware update supported for the Fast EtherHub-12mi
models via out-of-band Xmodem file transfer through the
serial port, or in-band TFTP file transfer over the network
Networking Flexibility
(via SmartExtender Modules)
• One slot supports optional slide-in network extender
modules for connection to 10BASE-T, 100BASE-TX,
100BASE-T4 or 100BASE-FX (on a separate segment)
• Transparent bridging (between stack and external device) via
optional network extender modules
• Uses adaptive cut-through switching (which dynamically
changes between fragment free cut-through and store-andforward depending on the CRC error rate)
• 100BASE-TX SmartExtender module automatically senses
transmission speed (at 100 Mbps or 10 Mbps)
• 100BASE-TX and 100BASE-FX SmartExtender modules
support two interface modes: full duplex or half duplex —
auto-negotiates transmission mode for full duplex and half
duplex (if same feature is supported by attached device);
otherwise can be manually configured
• Automatically learns MAC addresses to build the routing
information database
• Automatically filters local traffic
• Transparent to all higher level protocols
Easy Installation
• Flexible installation for desktop or rack (standard 19” size)
• Plug-and-play
• Self-diagnostics
• Automatic polarity detection and correction permits
automatic recovery due to wiring errors
• Automatic ID assignment and auto-terminator setting for
auto-configuration
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Fast EtherHub 3500 System User’s Guide
• Adapts to universal wide range voltage power
(i.e., 100V AC to 240V AC ™ 10%, 50~60 ™ 3Hz)
• Provides a slot for an optional backup power supply
Complete Standards
Conformance
• Conforms to IEEE 802.3u Class I repeater specification
and 100BASE-TX standard (i.e., 100 Mbps Fast Ethernet)
• Optional SmartExtender Modules conform to relevant IEEE
specifications and standards for respective media types
• Supports MIB II, Repeater MIB, Ethernet MIB, and
Accton’s private MIB
• Conforms to Simple Network Management Protocol (SNMP)
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Fast EtherHub 3500 System User’s Guide
Data Switching with the SmartExtender Modules
Switching Technology
The SmartExtender Modules that plug into the expansion slot
on the front panel of the Fast Ethernet 3500 series use advanced
switching techniques to provide a high-speed network
backbone. Each extender module acts as a two-port Ethernet
switch which effectively partitions the stack from the backbone.
The module scans the destination address from the packet
header, searches the routing table provided for the incoming
port and forwards the packet only if required, often before fully
received. A learning function stores the address and corresponding segment identifier of each incoming and outgoing
packet in a routing table. This information is subsequently
used to filter packets whose destination address is on the same
segment as the source address. This confines network traffic to
its respective domain, reducing the overall load on the network.
Configuration Options for the SmartExtender Modules
Only the 100BASE-TX and
100BASE-FX media support
full-duplex operation.
The SmartExtender Modules can be connected to either a
subnetwork, or directly to a server or key workstation. In
addition to partitioning an overloaded network, they provide a
connection between legacy 10BASE-T networks and the newer
generation 100BASE-TX, and can be configured to operate in
either full-duplex or half-duplex data transfer mode to support
the interconnection requirements of other high-speed devices.
These modules perform adaptive cut-through switching,
which is capable of instantly forwarding or filtering a packet
according to the destination address scanned from the packet
header. This technique transmits packets with near-zero latency.
Product Overview
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Fast EtherHub 3500 System User’s Guide
As a device functioning on the media access control (MAC)
layer, the extender modules are protocol independent, and
therefore compatible with IEEE802.3, IEEE802.3u, TCP/IP,
NetWare, DECnet and XNS protocols. They can provide a
connection between conventional 10BASE-T and high-speed
100BASE-TX networks; or can serve as a 2-port bridge in a
100BASE-TX or 100BASE-FX environment. Moreover, where
traditional 100BASE-TX networks restrict the maximum
distance between end-nodes to 205 meters, these modules break
down this barrier. By breaking your network into smaller and
more manageable segments, each linked to the larger network
with a SmartExtender Module, the maximum distance for
communications between end-nodes is unlimited (depending on
the specific timing requirements of your network applications).
Switching Methods
Traditional bridges and routers use a switching method called
store-and-forward in which the entire frame must be received
before performing a table look-up for the destination node and
forwarding the packet to the corresponding port. As a result,
each packet experiences a hefty delay. It may be necessary to
use store-and-forward when a lot data errors are occurring over
the network, or when connecting to very slow devices.
Compared to this “conservative” mode of operation, fragmentfree cut-through switching significantly reduces packet
transmission delay by picking the destination address out of the
header as soon as the first full 64 bytes has been received. This
technique directs the frame to the appropriate segment long
before the full packet has been received. It also cleans up the
data stream by preventing runts from being passed along,
thereby improving data reliability.
Although fragment-free cut-though switching is recommended
as the fastest method for most applications, store and forward is
also supported by the SmartExtender Modules to guarantee
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flawless performance. To ensure that you can manage any kind
of network load, the extender modules provide adaptive cutthrough switching based on Accton’s smart algorithm. This
method dynamically changes the way it handles data based on
the current error rate. This switching strategy start at fragmentfree for a clean to moderately dirty data environment, and
changes to store-and-forward for a highly contentious
environment. By using this method, the SmartExtender
Modules deliver the best networking performance under any
environment.
Moreover, in addition to using adaptive switching to optimize
throughput, these modules also support back pressure to
eliminate frame loss after their buffers fill by “blocking”
unwanted traffic from being passed onto a segment.
Product Overview
1-11
Chapter 2:
Installing the System
This chapter describes how to install the Fast EtherHub unit
and establish network connections. You may install this hub
on any level surface (e.g., a table or shelf) or in a standard
equipment rack. However, please take note of the following
minimum site requirements before you begin.
Pre-Installation Requirements
Before you start actual hardware installation, make sure you
can provide the right operating environment, including power
requirements, sufficient physical space, and proximity to other
network devices that are to be connected. Verify the following
installation requirements:
• Power requirements: 100 to 240 VAC (± 10%) at 50 to 60
Hz (± 3Hz). The hub’s power supply automatically adjusts
to accept the input voltage level.
• The hub should be located in a cool dry place, with at least
10 cm. of space at the front and back for ventilation.
• Place the switch out of direct sunlight, and away from heat
sources or areas with a high amount of electromagnetic
interference.
• If you intend to mount the hub on a rack, make sure you have
the mounting screws, brackets, bolts and nuts, and the right
tools.
• Be sure the network cables and connectors needed for
installation are available.
Installing the System
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Fast EtherHub 3500 System User’s Guide
Hardware Installation
F
This hub is suitable for desktop or rack-mount installation. A
good location is at the center of all the devices you want to link,
close to a collapsed backbone, and near a power outlet.
These hubs can be stacked with other hubs using a mounting rack or
directly on top of one another. Refer to the sections on Stacking
Hubs without a Rack or Mounting Hubs in a Rack for a description of
these methods.
If you don’t want to stack the hub with other hubs now, or you plan to
use the hub in a stand-alone configuration, go to the section on
Connecting the Hub System .
Stacking Hubs without a Rack
If you need to install a
redundant power module,
refer to Installing a Backup
Power Supply on page 2-11,
and complete that procedure
before stacking the hub.
The hub can be stacked anywhere there is a sufficiently large
flat space, such as on a table or desktop.
1. Stick the self-adhesive rubber foot pads (that come with this
package) on each of the 4 hollow spaces located on the
bottom of the first hub.
2. Place the first hub on a firm and flat surface in the area
where you want the stack to be installed.
3. Attach the rubber feet on each hub before stacking them.
They cushion the hub against shock/vibrations and provide
space between each hub for ventilation.
Figure 2-1 Stacking Hubs without a Rack
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Fast EtherHub 3500 System User’s Guide
Mounting Hubs in a Rack
If you need to install a
redundant power module,
refer to Installing a Backup
Power Supply on page 2-11,
and complete that procedure
before stacking the hub.
Please comply with the following instructions to ensure that
your hub is securely mounted in the rack.
1. Use an standard EIA 19-inch rack.
2. Use a Phillips (i.e., cross-head) screwdriver to attach the
brackets to the sides of the hub.
3. Position the hub in the rack by lining up the holes in the
brackets with the appropriate holes on the rack, and then use
the supplied screws to mount the hub in the rack.
Figure 2-2 Mounting Hubs Using a Mounting Rack
Installing the System
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Fast EtherHub 3500 System User’s Guide
Connecting the Hub System
Remember to label all your
connections at both ends of the
cable to facilitate troubleshooting
or future changes to network
configuration.
The Fast EtherHub has 12 RJ-45 shielded ports (i.e.,
100BASE-TX) that support connections to 100 Mbps Fast
Ethernet. Ports 1 - 12 (MDI-X) allow you to connect to devices
such as a workstation, server or router. While Port 12 (MDI)
lets you easily cascade to a compatible switch (i.e., connecting
from MDI to MDI-X ports on either device).
This hub also provides an expansion slot for plugging in
optional SmartExtender Modules. These modules support a
single connection to 100BASE-TX (10BASE-T), 100BASE-T4
or 100BASE-FX. They provide a convenient way to attach to
devices which use an alternate media type (e.g., linking fiber
optic cable to a remote device).
The transmission speed for ports on the optional 100BASE-TX
SmartExtender Module is automatically set at 10 or 100 Mbps to
match the operating speed of the attached device. Moreover, the
transmission mode of the ports on the optional 100BASE-TX and
100BASE-FX extender modules is automatically set at full or
half duplex to match the optimum capability of the attached
device.
Making a Connection via an MDI-X Station Port
You can connect an RJ-45 station port on the hub to any device
that uses a standard LAN interface such as a workstation or
server, or also to a network interconnection device such as a
bridge or router (depending on the port type implemented).
1. Prepare the network devices you wish to network. Make
sure you have installed suitable 100BASE-TX network
interface cards before making a connection to any of the
hub’s station ports. You also need to prepare straightthrough 100W Category 5 shielded or unshielded twisted-pair
cables with RJ-45 plugs at both ends.
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2. Connect one end of the cable to the RJ-45 port of the network
interface card, and the other end to any available (MDI-X)
station port on the hub. Just remember that if you use Port
12MDI-X, the daisy-chain port (12MDI) cannot be used. When
inserting an RJ-45 plug, be sure the tab on the plug clicks into
position to ensure that it is properly seated. Using the hub in a
stand-alone configuration, you can network up to 12 nodes.
I
Do not plug a phone jack connector into the RJ-45 port. This may
damage the switch. Instead, use only twisted-pair cables with RJ-45
connectors that conform with FCC standards.
Notes: 1. Make sure each twisted-pair cable does not exceed 100 meters.
2. We advise using Category 5 cable for all network connections to
avoid any confusion or inconvenience in the future when you
upgrade attached devices to Fast Ethernet.
3. You may also connect a device to the switching port located on
hub’s front panel if required. However, be sure you use a
SmartExtender Module that meets your communication requirements.
Refer to SmartExtender Module in Chapter 1 for more details.
4. To facilitate troubleshooting, label all network cables to indicate the
attached device and location.
Connecting to the Stack’s Backplane
Plug one end of the FlexBus 3500 stack cable (provided with
the base package) in the Out port of the top hub and the other
end to the In port of the next hub. Repeat this step for each hub
in the stack. Form a simple chain starting at the Out port on the
first hub and ending at the In port on the last hub. Refer to
FlexBus Ports in Chapter 5 for related information.
F
Hubs in a stack can only be grouped into segments through the
FlexBus 3500 stack cable. You should therefore use the FlexBus ports to
make Out to In connections in a stack.
Hubs in a stack can only be managed by the network management
agent through the stack cable. In a managed stack, you should therefore
use the stack ports to make Out to In connections, and include a
management agent (i.e., a Fast EtherHub-12mi) in the chain.
You can also cascade hubs using the daisy-chain port (Port 12MDI).
However, hubs cascaded using the daisy-chain port cannot be managed by
the management agent. See the next section for details.
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Fast EtherHub 3500 System User’s Guide
Making a Connection via the MDI Daisy-Chain Port
The Fast EtherHub 3500 hubs
are Class I repeaters. Class I
repeaters cannot be cascaded
to another repeater in the same
collision domain.
The daisy-chain port can only
be cascaded to another device
which breaks up the collision
domain (e.g., an Ethernet
switch).
Stackable Fast Ethernet hubs are generally restricted to Class I
repeater types due to the timing requirements for passing traffic
and management data across the stack’s backplane. Although
Class I repeaters cannot be cascaded to another device in the
same collision domain via the daisy-chain port, more powerful
interconnection options are provided via the hub’s backplane
and optional SmartExtender Modules.
The daisy-chain port can only be cascaded to another device
which breaks up the collision domain (e.g., an Ethernet switch).
Prepare straight-through 100W Category 5 shielded or
unshielded twisted-pair cables with RJ-45 plugs at both ends.
Connect one end of the cable to the 12MDI port on this hub,
and the other end to a standard MDI-X station port on the other
device. Remember that when using the daisy-chain port
(12MDI), station port (12MDI-X) cannot be used. When inserting
an RJ-45 plug, be sure the tab on the plug clicks into position
to ensure that it is properly seated.
Notes: 1. Make sure the twisted-pair cable does not exceed 100 meters.
2. To connect to a switch, you may also run straight-through twistedpair cabling from a station port on this hub to a crossover port on
the switch. However, if you must connect to a switch via station
ports at both ends of the cable, use crossover cabling.
Connecting to a SmartExtender Module
The Fast Ethernet 3500 Series includes a network expansion
slot on the front panel that supports connection to 100BASE-TX
(10BASE-T), 100BASE-T4 or 100BASE-FX. Each
SmartExtender Module acts as a two-port switch that can
forward and filter data frames at line speed. One port is
connected to the hub’s internal repeater bus, while the other
port (on the hub’s front panel) can be used to connect the hub to
any compatible network device. The optional extender modules
include:
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10BASE-T
100BASE-TX
100BASE-T4
100BASE-FX
- EM3551-TX SmartExtender Module
- EM3551-TX SmartExtender Module
- EM3551-T4 SmartExtender Module
- EM3551-FX-ST SmartExtender Module
EM3551-FX-SC SmartExtender Module
Note: The EM3551-TX automatically adjusts to 10 or 100 Mbps using
auto-sensing. Refer to SmartExtender Module in Chapter 1.
I
Retain the face plate for
possible future use.
I The SmartExtender
Modules and not hot-swappable.
Be sure the hub is powered off
when installing these modules
Avoid running your cables near
equipment that may generate
electromagnetic interference.
The SmartExtender Modules are not hot-swappable. Be sure you
power off the hub before installing any of these modules.
Installing a SmartExtender Module - If you need to install an
extender module, take the following steps:
1. Disconnect power to the hub.
2. Remove the face plate on the expansion slot (or a previously
installed SmartExtender Module) by removing the two
screws with a Phillips (i.e., cross-head) screwdriver.
3. Before opening the package that contains the extender
module, touch the bag to the hub casing to discharge any
potential static electricity.
4. Remove the module from the anti-static shielded bag.
5. Holding the module level, gently push it all the way into the
expansion slot, ensuring that it firmly engages with the
connector.
6. If you are sure the module is properly mated with the
connector, replace the retainer screws to secure the module
in the expansion slot.
7. Run corresponding media type between the extender module
and the target device.
Connecting Twisted-pair Cabling - For the 100BASE-TX and
100BASE-T4 modules, prepare Category 5 straight-through
twisted-pair cables with RJ-45 plugs at both ends. When
connecting the module directly to an end-node device (e.g., a
workstation or file server), a bridge or router, run cable from the
MDI-X port on the SmartExtender Module to the target device.
However, when connecting the module to a hub or switch,
Installing the System
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Fast EtherHub 3500 System User’s Guide
connect one end of the cable to the MDI port on the extender
module, and the other end to the MDI-X port on the target
device (or vice versa). When inserting an RJ-45 plug, be sure
the tab on the plug clicks into position to ensure that it is
properly seated. Note that as a general rule, the length of any
twisted-pair cable should not exceed 100 meters.
Connecting Fiber Optic Cabling - For the 100BASE-FX module,
prepare fiber optic cable with SC or ST connectors at both
ends. When connecting the module directly to an end-node
device (e.g., workstation or file server), run cable from the Rx
(Tx) port on the module to the Tx (Rx) port on the target
device. Also, when daisy-chaining SmartExtender Modules,
make similar connections between the current module and the
next device in the stack. When inserting a cable, be sure the tab
on the plug clicks into position, to ensure that it is properly
seated. Note that as a general rule, the length of fiber optic
cable should not exceed 2 kilometers. However, power
budgeting must be considered when calculating the maximum
cable length for your specific environment (as described later in
this chapter).
- When using fiber
optic cabling, the maximum length between two hubs can be up
to 2 kilometers. However, you must consider power loss when
calculating the actual length of cable that can be used with your
system. You can calculate power loss with the following formula:
Distance Limit and Power Loss in Fiber Optics
m = (p dB - i dB)
c dB/km
Variable
m
p dB
i dB
c dB/km
Description
cable length (kilometers)
power budget
intervening devices
(e.g., patch cables and splices)
loss per kilometer of cable
Table 2.1 Calculating the Power Budget for Fiber Optics
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Note: To determine the power loss incurred by intervening devices and
specific cable type, inquire with the manufacturer. The power budget
depends on the gauge of cable as shown below.
Gauge of Fiber Cable
50/125 mm
62.5/125 mm
Power Budget
9.2 dB
13 dB
Table 2.2 Power Budget for Common Guage Fiber Optics
For a sample calculation, assume the following values:
• cable gauge - 62.5/125 mm, which means a 13 dB power budget,
• 2 patch panels along the path, each with 1.5 dB power loss,
• 1 splice with 1 dB power loss, and
• inherent power loss in the cable is 4 dB/km
The maximum cable length is therefore:
m = 13 dB - 4 dB = 2.25 km
4 dB/km
I
When the 100BASE-FX link is set for the full-duplex
communications (i.e., a dedicated connection), cable length
should not exceed 2 kilometers. However, when the link is set
for half-duplex communications (i.e., a shared collision domain),
cable length should not exceed 412 meters (IEEE 802.3u).
Note: Even though your calculations for power loss may indicate a longer
permissible length based on signal strength (as seen in the preceeding
example), we advise remaining within the recommended limits.
Maximum Segment Length - In contrast to cascading devices
through repeater ports, cascading through the SmartExtender
Module breaks up the collision domain. The number of devices
that can be cascaded is therefore theoretically unlimited.
However, in practice, the length of a cascade (even one passing
through switching ports, as implemented in the extender
modules) may be limited by the time-out requirements of the
particular applications running over the network. Considering
these delay factors, the IEEE 802.1D standard (i.e., RFC for
MAC bridges) recommends restricting the number of
interconnection devices between any two nodes to seven.
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Setting the Communication Mode - The 100BASE-TX and
100BASE-FX SmartExtender Modules both support half and
full-duplex communications. The hub uses auto-negotiation to
determine the transmission mode for any new connection made
to these modules. However, if a connected device does not also
support auto-negotiation, and a link cannot be established using
half duplex (i.e., the last state tested by auto-negotiation), then
you must manually set the transmission mode for the concerned
port to full or half duplex via on-board configuration (Chapter
4) or using optional network management software.
Bridging Functions - The SmartExtender Modules form a
separate segment (i.e., collision domain) from the rest of the
ports in the stack. They therefore provide fully transparent
bridging functions which automatically learns node addresses
required to filter and forward traffic based on the destination
address (i.e., traffic is filtered if the destination address is in the
local collision domain, or forwarded if the destination is in
another segment).
Note: Devices connected to the SmartExtender Module exist in a
separate segment, and cannot be controlled by a management agent in
the stack.
Switching Functions - These modules also provide functions
commonly found on an Ethernet switch. The scheme used to
process data packets is automatically adjusted to optimize
system performance. Fragment-free cut-through or store-andforward processing may be used depending on the current error
rate. (Refer to Data Switching with the SmartExtender Modules in
Chapter 1 for a detailed discussion of these processing
methods.)
In addition to the features listed above, the extender modules
also use back pressure to eliminate frame loss when its buffers
fill, by “slowing” the traffic received from end stations or
segments connected directly to this port.
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SEM
RJ-45
SEM
SEG1
SEG2
RJ-45
SEG3
This stack has been fully
interconnected using two
extender modules.
Interconnecting Stack Segments - Hubs can be completely
isolated from the stack, or can be attached to any of the three
available segments embedded in the backplane. When attached
to a segment (i.e., common collision domian), the hub can
communicate with all other devices attached to that segment.
(Refer to the discussion on Mult-Segment Architecture in Chapter 3,
and to Configuring Hub Parameters in Chapter 4.)
A Fast EtherHub stack can be split into three separate (isolated)
segments. The best way to interconnect these different segments
is to connect a (100BASE-TX) SmartExtender Module to a
repeater port on a hub in a different segment, using an MDI to
MDI-X connection. Two extender modules can be used in this
way to connect all three segments
You can also make a direct connection between extender
modules (i.e., similar media types) that exist in two different
segments in the stack. However, this approach is not only more
costly, but also entails a slightly higher transit delay for trafffic
passing between the segments.
The last alternative is to connect different segments via a Fast
Ethernet switch or router. Because this is the most expensive
approach, we do not advise it unless you already have a suitable
interconnection device available.
Installing a Backup Power Supply
If you need to install a backup power module, take these steps:
1. Remove the face plate on the optional power bay (or a
previously installed power module) by turning the two
retaining knobs on the rear panel counterclockwise.
2. Holding the module level, gently push it all the way into the
empty bay, ensuring that it firmly engages with the connector.
3. After you are sure the module is properly seated in the bay,
tighten the retaining knobs to secure it in place.
4. Connect power to the backup power supply. Use separate
AC circuits to provide optimal backup capability.
Note: Leave at least 12 inches clearance in the back of the hub (or
stack) to facilitate system maintenance (e.g., removing power modules).
Installing the System
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Fast EtherHub 3500 System User’s Guide
Powering on the Hub
1. Plug one end of the power cord into a power outlet, and the
other end into the power socket at the rear of the hub (in that
order for reasons of safety). Then plug in the backup power
module if you purchased this option. For reliable backup,
connect the backup power module to a separate AC circuit.
2. Check the LED indicator marked PWR1 (or PWR2) on the
front panel to see if it is on. The unit will automatically
select the setting that matches the connected input voltage.
Therefore, no additional adjustments are necessary when
connecting it to any input voltage within the range marked
on the rear panel.
3. The hub performs a self-diagnostic test upon power-on.
(Note that this test takes about 15 seconds to complete.) For
details about the system self-diagnostic test, refer to the
following section.
I
The unit supports a "hot remove" feature which permits you to
connect/disconnect network cables without powering off the hub and
without disrupting the operation of the hubs in stack. However, when
changing SmartExtender Modules or power supply modules, first
disconnect power to the concerned hub.
Diagnostic Tests
Upon power on, the system performs an internal self-diagnostic
test of major hub components. If any component fails during
the test, the hub will try to complete the diagnostic procedure.
Otherwise, the system will hang. For related information, refer
to Diagnostics Test Indicators in Chapter 5.
2-12
Installing the System
Fast EtherHub 3500 System User’s Guide
The following table shows the components to be tested.
Test Function/Component
Fast EtherHub-12i
Fast EtherHub-12mi
Boot ROM
All tests listed for Fast EtherHub-12i
Hub Configuration EEPROM
and then the following tests:
RAM for Repeater Board CPU
Console I/O
Repeater Information Base SRAM
Flash ROM for SNMP Firmware
Repeater Interface Controller
EEPROM for Stack Configuration
Routing Table for Internal SEM Port
DRAM Buffer for Management Program
Input Queue for Internal SEM Port
Management Bus Output Buffer
Output Queue for Internal SEM Port
Management Bus Input Buffer
Routing Table for External SEM Port
Network Interface Controller
Input Queue for External SEM Port
Output Queue for External SEM Port
Table 2.3 Diagnostic Test Functions
Hot Remove
The Fast EtherHub 3500 System supports “hot remove”
capability that allows you to connect/disconnect hubs or media
connectors from the system with minimal disruption to the
network. You can remove any network cabling without
affecting traffic passing across the internal repeater bus.
However, if the FlexBus 3500 stack cable is disconnected at
any point in the stack, or is not properly terminated, all Ethernet
and management traffic passing across the stack’s backplane
will be disrupted.
I
When changing modules in the expansion slot or changing power
supply modules, first disconnect power to the concerned hub.
Installing the System
2-13
Fast EtherHub 3500 System User’s Guide
Configuring a Manageable Stack
To manage the stack with the on-board configuration program
or any optional network management software, the stack must
include an EtherHub-12mi (i.e., a unit with an SNMP agent).
Moreover, the network management station must be able to
access the segment containing the management agent.
You should also consider adding a backup SNMP agent to
provide greater management reliability for critical applications.
The procedures required to install a backup agent is described
below.
Installing an SNMP Backup Agent
The on-board configuration
program only provides access
to the private MIB. To gain full
SNMP functionality, you must
use optional network
management software (e.g.,
AccView/Open).
Just add the backup agent(s) to the stack and let the system
automatically choose the Master agent and the Slave agent
based on longest up-time. The Master indicator on the device
chosen as the primary agent will turn ON. The Backup indicator
will turn ON for all other hubs (attached to the same segment)
that contain SNMP agents.
Note: If you attach SNMP agents to separate segments, be sure they
are assigned unique IP addresses via on-board configuration (as
described under Changing the Segment Configuration in Chapter 4).
2-14
Installing the System
Fast EtherHub 3500 System User’s Guide
Verifying Port Status
Check each connection by viewing the port status indicators
listed below. (For a more detailed description on these
indicators, refer to Chapter 5.)
LED
State
Indication
Link
On
Port has established a valid network connection.
Traffic
Blinking
Traffic is traversing the port.
Tx/Rx1
Blinking
Traffic is traversing the port.
1001
On
Communications have been set to a speed of 100 Mbps.
FDX1
On
Communications have been set to full-duplex mode.
1 - The indicators appear on the front of the SmartExtender Module.
Table 2.4 Checking Key LED Indicators
If the Link status indicator is not functioning properly, or you
experience any other difficulties in setting up the switch, refer
to Appendix A.
Verifying System Operation
Verify that all attached devices have a valid connection. The
hub monitors link status for each port. If any device is properly
connected to the hub and transmitting a link beat signal, the
Link indicator lights for the corresponding port. If the Link
indicator fails to light when you connect a device to the hub,
check the following items • Be sure the media cable is properly attached to the connected
device and the hub. Verify that the cable connector snaps
into place when attached.
• See if the media cable is functioning properly by using it for
another port and attached device that displays valid
indications when connected to the network.
Installing the System
2-15
Fast EtherHub 3500 System User’s Guide
• Verify that you have not exceeded the specified limits for any
attached media type as summarized in the following table:
Media Type
Twisted Pair
Fiber Opitc
Maximum Length (meters)
100
412 (at half duplex)
2000 (at full duplex)
Table 2.5 Maximum Cable Length
• If a computer is attached to the hub, verify that its adapter
card is functioning properly by trying it in another computer
that has been successfully connected to the network.
• When using the 100BASE-TX or 100BASE-FX
SmartExtender Module, both sides of each connection must
use the same transmission mode (i.e., full or half duplex). If
the device connected to the hub operates at full duplex but
does not support auto-negotiation, then you must manually set
the transmission mode with the configure button. (Refer to
section on Communication Mode earlier in this chapter.)
If you still can’t resolve the problem, please refer to
Troubleshooting in Appendix A.
2-16
Installing the System
Chapter 3:
Setting up Network Connections
Special Architecture Used for the Fast EtherHub 3500 Stack
Multi-Segment Architecture
The Fast EtherHub 3500 system supports multi-segment
configuration through the FlexBus cabling. Three Ethernet
segments (i.e., separate collision domains) are embedded in the
hub’s FlexBus port (i.e., the stack’s backplane). You can
choose to attach a hub to one of these segments, or to leave it
isolated except for the management channel. Nodes attached to
a specific segment (e.g., Segment 1) can only communicate
with nodes attached to the same segment (unless the segments
are interconnected with a device such as an Ethernet switch).
This type of architecture makes the system more flexible,
provides better traffic load sharing and data protection,
improves network bandwidth utilization, and simplifies
troubleshooting.
Carefully plan your network setup to make this architecture
work well for your system. Form a common domain for
devices that need to frequently communicate with each other
by attaching them to the same segment. In this way you can
arrange network resources to balance traffic and thereby
increase overall network efficiency.
To combine the segments into an interconnected network (while
at the same time retaining the higher effective bandwidth and
segment integrity provided by the multi-segment architecture),
attach each segment to a switch or similar interconnection device,
such as one of Accton’s Fast Ethernet Switches.
Setting Up Network Connections
3-1
Fast EtherHub 3500 System User’s Guide
FlexBus 3500 Management Link
The management link in a chain of cascaded hubs must be
connected to manage the stack as a single unit. This means that
only hubs connected using the FlexBus can be controlled by an
SNMP management agent (i.e., Fast EtherHub-12mi). At most, 6
hubs can be managed and linked together using the FlexBus
connection.
Hub ID Setting
In a stacked system, each hub should have a unique ID number
to identify itself. Each hub automatically sets an ID number if
attached to an SNMP management agent through the FlexBus port
(i.e., Fast EtherHub-12mi). When a new hub is inserted in the
stack, the next available hub identifier is assigned to the new hub
(i.e., the identifier numbers are not changed for previously
configured hubs). When the stack includes a management agent,
you can also set hub IDs using the on-board configuration
program. Refer to Configuring Hub Parameters in Chapter 4 for more
information.
Using Management Agents
The Fast EtherHub-12mi SNMP includes an SNMP management
agent. To add SNMP functionality to the entire stack, this hub
type must be included in the stack. To provide in-band access to
the agent you must also attach your network management station
to a the segment that includes the management agent.
3-2
Setting Up Network Connections
Fast EtherHub 3500 System User’s Guide
Multiple Agents
The on-board configuration
program only provides access
to the private MIB. To gain full
SNMP functionality, you must
use optional network
management software (e.g.,
AccView/Open).
You may include multiple agents in a stack. To provide a failsafe backup management agent, include it in the same segment
with the Master agent. You may also use several active agents
in the same stack. However, they must be attached to different
segments and have unique IP addresses.
SNMP Backup Agent
The Fast EtherHub 3500 system supports a backup function for
the management agent. This special function allows the stack to
have two or more SNMP network management agents attached
to the same segment, wherein one agent is configured as the
Master agent and the other(s) as a Slave (i.e., Backup) agent.
The agent in slave mode behaves as a Fast EtherHub-12i. But if
the Master agent fails, the Slave agent takes over its functions
using the latest data mirrored from the Master, including its IP
address. Note that to manage the stack out-of-band after the
Slave has assumed control, you must plug your PC or modem
into the Serial port of the Slave agent. If you are using optional
network management software, just ensure that your network
management station can access the new control agent via its
current network connection.
Note: Placing redundant agents in a segment will cause the system to
set the agent with longest up-time as the Master, and the other(s) as a
slave. If more than one slave exists in a segment, the slave higher up in
the FlexBus chain will be chosen to function as the Master if it fails.
Setting Up Network Connections
3-3
Fast EtherHub 3500 System User’s Guide
Port Backup Function
The Fast EtherHub 3500 system supports a port backup
function (i.e., a redundant link). A hub system can have up to
18 pairs of redundant links. These links are configurable using
the in-band or out-of-band management program. When a
primary link fails, the secondary (i.e., backup) link
automatically takes over.
Notes: 1. To prevent traffic from looping, the primary port is enabled and the
backup port disabled. If the system is functioning normally, the Link
indicator for the primary port and the Partition indicator for the
backup port will be on.
2. It is common practice to attach these links to the same physical
device (e.g., two separate adapter cards on a critical server).
However, to provide more flexibility, this is not enforced by the
configuration program.
Security Features
Intrusion Protection
Any repeater port on the hub can be configured with a preferred
source address. If an unauthorized intruder is detected, the
network management station can be notified, or a trap can be
sent and the port disabled.
3-4
Setting Up Network Connections
Fast EtherHub 3500 System User’s Guide
Sample Network Configurations
The Fast EtherHub 3500 series stackable hubs are designed to
provide flexibility in configuring network connections. This
hub can be used as a simple stand-alone hub or connected to
other network interconnection devices in various configurations.
This section includes sample applications, most of which take
advantage of the multi-segment architecture. Pay attention to
the examples that illustrate how to segment a hub stack. This
procedure can extend network bandwidth up to 300 Mbps.
Attaching the Stack to One Segment
You can attach all the hubs in a stacked system to the same
segment. In this example, a stacked system using the FlexBus
port connection is connected to segment 1.
Putting all hubs in the same segment groups all nodes attached
to the stack in a single collision domain. All Ethernet frames
transmitted by any node are seen by every other node in the
stack. For a heavily loaded network, you can significantly
improve performance by configuring the stack into separate
segments as shown in the next example.
SEGMENT 1
EtherHub3500
ID1
MANAGEMENT
CHANNEL
EtherHub3500 HUB
SEGMENT 1
SEG. LINK 1
ID2
SEG. LINK 2
EtherHub3500 HUB
SEGMENT 1
ID3
SEG. LINK 3
EtherHub3500 HUB
SEGMENT 1
ID4
SEGMENT 1
ID5
SEGMENT 1
ID6
EtherHub3500 HUB
EtherHub3500 HUB
FlexBus 3500 Cable
Figure 3-1 Attaching All Hubs in Stack to One Segment
Setting Up Network Connections
3-5
Fast EtherHub 3500 System User’s Guide
Attaching the Stack to Multiple Segments
This example shows 3 independent Ethernet LANs in a stacked
system. Hubs 1 and 2 are attached to segment 1, while hubs 3
and 4 are attached to segment 2, and hubs 5 and 6 are attached
to segment 3.
This configuration serves to both balance the network load and
improve performance. Using three separate segments provides
300 Mbps of Ethernet bandwidth to the overall stack. Moreover,
using a segmented configuration serves to confine the effects of
heavy loading or network problems to a single segment.
SEGMENT 1
ID 1
SEGMENT 1
ID 2
SEGMENT 2
ID 3
EtherHub3500 AGENT
MANAGEMENT
CHANNEL
EtherHub3500 HUB
SEGMENT 2
ID 4
SEGMENT 3
ID 5
SEGMENT 3
ID 6
SEG. LINK 1
SEG. LINK 2
EtherHub3500 HUB
SEG. LINK 3
EtherHub3500 HUB
EtherHub3500 HUB
EtherHub3500 HUB
FlexBus 3500 Cable
Figure 3-2 Attaching Hubs in Stack to Three Segments
F
3-6
Traffic in each segment is restricted to that segment and cannot pass
to another segment without a device such as a SmartExtender Module
or one of Accton’s Fast Ethernet Switches to link them.
Setting Up Network Connections
Fast EtherHub 3500 System User’s Guide
Isolating Specific Hub Connections
You can interconnect or isolate the hubs in a stack using a
multi-segment configuration. In a stacked system, some hubs
may be connected to a segment while others are isolated (not
attached to any segment). In this example, hubs 1 and 2 are
attached to segment 1, while hubs 3 and 4 are attached to
segment 2. However, hubs 5 and 6 are not connected to any
segment. These hubs form isolated segments. With careful
planning, you can restrict access for specific user groups to
required connections only.
SEGMENT 1
ID 1
EtherHub3500 AGENT
EtherHub3500 HUB
SEGMENT 1
ID 2
SEGMENT 2
ID 3
SEGMENT 2
ID 4
ISOLATED
ID 5
ISOLATED
ID 6
MANAGEMENT
CHANNEL
SEG. LINK 1
EtherHub3500 HUB
SEG. LINK 2
SEG. LINK 3
EtherHub3500 HUB
EtherHub3500 HUB
EtherHub3500 HUB
FlexBus 3500 Cable
Figure 3-3 Linking Part of the Stacked Hubs to a Segment
F
When hubs are isolated, they cannot communicate with any other
device in the stack via the FlexBus.
Setting Up Network Connections
3-7
Fast EtherHub 3500 System User’s Guide
Isolating Each Hub
In this example, each hub in the stack is an independent
segment (i.e., isolated collision domain). Hubs 2 to 6 are not
connected to any of the 3 segments embedded in the FlexBus
3500 cable.
ID 1
E the rH ub 350 0 A G E NT
M AN AG E M E N T
C H ANN E L
E therH ub3500 HU B
ID 2
S E G . L IN K 1
S E G . L IN K 2
E therH ub3500 HU B
ID 3
ID 4
S E G . L IN K 3
E therH ub3500 HU B
E therH ub3500 HU B
ID 5
ID 6
E therH ub3500 HU B
FlexB us 35 00 C ab le
Figure 3-4 Stacked Hubs Not Linked to a Segment
F
3-8
If the Fast EtherHub-12mi is isolated from the backplane (i.e., not
attached to any of the 3 segments), the stack can still be managed
with the out-of-band configuration program via the management
channel embedded in the FlexBus 3500 cable.
Setting Up Network Connections
Fast EtherHub 3500 System User’s Guide
Extending the Network with Alternate Connections
You can extend your network by connecting any of the hubs in
a stacked system to other compatible hubs via the
SmartExtender Module. In the diagram below, a stand-alone
hub is connected to hub 3 in the stacked system using the
extender module. However, remember that the Fast EtherHub
3500 Agent can only manage hubs connected to it through the
FlexBus connection.
SEGMENT 1
ID 1
EtherHub3500 AGENT
MANAGEMENT
CHANNEL
EtherHub3500 HUB
SEGMENT 1
SEGMENT 2
ID 2
ID 3
SEGMENT 2
ID 4
SEGMENT 3
ID 5
SEGMENT 3
ID 6
SEG. LINK 1
SEG. LINK 2
EtherHub3500 HUB
SEG. LINK 3
EtherHub3500 HUB
EtherHub3500 HUB
EtherHub3500 HUB
EtherHub3500
FlexBus 3500 Cable
Figure 3-5 Linking Stacked Hubs to Unmanaged Hubs
via the SmartExtender Module
Setting Up Network Connections
3-9
Fast EtherHub 3500 System User’s Guide
Linking the Stack to a Management Station
In a stacked system, connect the in-band management workstation
to the same segment that the management agent is attached to. In
this example, the management agent is attached to segment 1.
Thus, the in-band management workstation (e.g., a PC running
AccView/Open) should also be connected to segment 1.
SEGMENT 1
EtherHub 3500 AGENT
MANAGEMENT
CHANNEL
EtherHub3500 HUB
SEG. LINK 1
SEGMENT 1
SEG. LINK 2
EtherHub3500 HUB
SEG. LINK 3
SEGMENT 2
EtherHub3500 HUB
SEGMENT 2
EtherHub3500 HUB
SEGMENT 3
ACCVIEW
EtherHub3500 HUB
SEGMENT 3
AccView Station
(Segment 1)
FlexBus 3500 Cable
Figure 3-6 Linking Stacked Hubs to a Network Management Station
3-10
Setting Up Network Connections
Fast EtherHub 3500 System User’s Guide
Interconnecting the Segments
The 3 segments within a stacked system can be combined into an
interconnected network using the SmartExtender Modules. For
example, you can connect all the segments in the stack using just
two extender modules as shown below. Using this approach, you
provide a higher bandwidth by using three separate collision
domains, but still permit stations to communicate with nodes in
other segments, as required.
ETHERHUB3500 AGENT
SEGMENT 1
ACCVIEW
ETHERHUB3500 HUB
SEGMENT 1
AccView Station
Inter-Segment Link
ETHERHUB3500 HUB
SEGMENT 2
ETHERHUB3500 HUB
SEGMENT 2
Inter-Segment Link
ETHERHUB3500 HUB
SEGMENT 3
ETHERHUB3500 HUB
FlexBus 3500 Cable
SEGMENT 3
Figure 3-7 Linking Segments in a Stacked System
Setting Up Network Connections
3-11
Fast EtherHub 3500 System User’s Guide
Connecting Remote Stacks
Fast EtherHub stacks can be connected by using the
SmartExtender Modules. For example, you can connect two
stacks by running a cable from the extender module in one stack
to any station port in a remote stack. When using twisted-pair
cable, the maximum cable length is 100 meters. Also note that
when you connect directly to a repeater bus in this manner, the
transmission mode is limited to half duplex.
You can connect stacks over an even greater distance if you run
fiber optic cable between SmartExtender Modules in both stacks.
When you connect to switching ports at both ends of the cable, the
transmission mode is automatically set to full duplex, allowing
you can run a fiber optic link up to 2 kilometers. However, if you
must operate at half duplex, then the maximum separation
between stacks is 412 meters .
STACK 1
ETHERHUB3500 HUB
ETHERHUB3500 HUB
STACK 1
Remote Stack Link
(Up to 100 meters with twisted-pair cable)
ETHERHUB3500 HUB
STACK 2
ETHERHUB3500 HUB
STACK 2
Remote Stack Link
(Up to 2 kilometers with fiber optic cable)
ETHERHUB3500 HUB
STACK 3
ETHERHUB3500 HUB
STACK 3
Figure 3-8 Connecting Remote Stacks
3-12
Setting Up Network Connections
FlexBus 3500 Cable
Fast EtherHub 3500 System User’s Guide
Operating in the Novell NetWare IPX Environment
If you’re using Novell NetWare server as your Network
Operating System, you can have up to 3 LAN adapters installed
in the File Server. With this type of setup, the network is
perceived as logically divided into different collision domains,
but the File Server is still accessible by all nodes. As shown in
the following figure, three LAN adapters installed in a NetWare
server are each connected to a hub in the stack with IPX
Protocol bound to each adapter.
The first adapter is attached to segment 1 with IPX network
number 102; the second adapter is attached to segment 2 with
IPX network number 103; and the third one is connected to
segment 3 with IPX network number 104.
EtherHub 3500 Agent
SEGMENT 1
IPX net number=102
SEGMENT 1
EtherHub 3500 Hub
SEGMENT 1
EtherHub 3500 Hub
SEGMENT 2
IPX net number=103
SEGMENT 2
EtherHub 3500 Hub
SEGMENT 2
EtherHub 1500 Hub
SEGMENT 3
IPX net number=104
NOVELL NetWare Server
EtherHub 1500 Hub
SEGMENT 3
SEGMENT 3
Figure 3-9 System Applied in Novell NetWare IPX Environment
Setting Up Network Connections
3-13
Fast EtherHub 3500 System User’s Guide
Operating in the TCP/IP Environment
In TCP/IP Internet environment, gateways are used to improve
performance and regulate network traffic by confining most
network activity to their respective local network, and still
maintain communication links among LANs of the same or
different architectures. You can implement an IP subnet
gateway if you have an IP network address (e.g., 140.20.0.0).
For example, in a Fast EtherHub 3500 system (as shown in the
figure below), you can attach three LAN adapters to your
subnet gateway using a UNIX server. Perform the following
steps.
Assign IP addresses from 140.20.1.1 ~ 140.20.1.254 to nodes on
segment 1, and set their subnet mask to 255.255.255.0.
Assign IP addresses from 140.20.2.1 ~ 140.20.2.254 to nodes on
segment 3, and set their subnet mask to 255.255.255.0.
Assign IP addresses from 140.20.3.1 ~ 140.20.3.254 to nodes on
segment 2, and set their subnet mask to 255.255.255.0.
Assign IP address 140.20.1.10 to the first adapter, 140.20.2.20 to the
second adapter, and 140.20.3.30 to the third one.
SEGMENT 1
EtherHub 3500 Agent
SEGMENT 1
EtherHub 3500 Hub
SEGMENT 1
IP
EtherHub 3500 Hub
= 140.20.1.10
SEGMENT 2
SEGMENT 2
IP = 140.20.2.20
EtherHub 3500 Hub
SEGMENT 2
IP =140.20.3.30
EtherHub 3500 Hub
SEGMENT 3
SEGMENT 3
EtherHub 3500 Hub
SEGMENT 3
NOVELL NetWare Server,
Unix Server(e.g., SCO Unix)
SubnetMask = 255.255.255.0 for all segments
Figure 3-10 System Applied in TCP/IP Environment
3-14
Setting Up Network Connections
Fast EtherHub 3500 System User’s Guide
Connecting to the Network Backbone
The stack can be connected to the network backbone by attaching
it to a device such as a Fast Ethernet switch. The following figure
shows a direct connection from the stack’s daisy-chain port to a
100BASE-TX switch which is serving as collapsed network
backbone.
SEGMENT 1
ETHERHUB3500 AGENT
ACCVIEW
ETHERHUB3500 HUB
SEGMENT 1
AccView Station
ETHERHUB3500 HUB
SEGMENT 2
ETHERHUB3500 HUB
SEGMENT 2
ETHERHUB3500 HUB
SEGMENT 3
ETHERHUB3500 HUB
FlexBus 3500 Cable
SEGMENT 3
Links to Network
Collapsed Backbone
Fast Ethernet Switch
Figure 3-11 Connecting to the Network Backbone
Setting Up Network Connections
3-15
Fast EtherHub 3500 System User’s Guide
Configuring IPX Trap Managers
When the hub experiences an unusual event, a message is
issued to all listed network managers. Networks compliant
with Internetwork Packet Exchange (NetWare IPX) protocol
can pass trap messages to IPX Trap Managers as shown below:
IPX Trap Managers
Return to Previous Panel
IPX Address
1.
2.
3.
4.
5.
Community Name
00-00-13-52:00-00-00-00-E8-90
00-00-00-00:00-00-00-00-00-00
00-00-00-00:00-00-00-00-00-00
00-00-00-00:00-00-00-00-00-00
00-00-00-00:00-00-00-00-00-00
public
public
public
public
public
Status
ENABLED
DISABLED
DISABLED
DISABLED
DISABLED
Return to previous panel.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-9 IPX Trap Managers Menu
Menu items are briefly described in the following table.
Field
IPX Address
Community Name
Status
Description
IPX address of the trap receiver. (Provide dotted decimal notation with both the network and MAC
address components.)
The community string required for trap management access.
The status of the current entry can be set to ENABLED or DISABLED.
Table 4.8 IPX Trap Managers Menu
4-18
Configuring the System
Fast EtherHub 3500 System User’s Guide
Changing the Segment Configuration
When accessing the EtherHub system with in-band tools such
as SNMP, Telnet or TFTP, you must configure the hub to use
IP, IPX or SNMP over Ethernet protocols. Use the Segment
Configuration menu to display the following screen:
Segment Configuration
Return to Previous Panel
Segment 1
: R&D
Segment 2
Segment 3
: 203.70.236.1
: 255.255.255.0
: 203.70.236.254
: 203.70.236.9
Save to EEPROM
203.70.236.2
255.255.255.0
0.0.0.0
0.0.0.0
Save to EEPROM
203.70.236.3
255.255.255.0
0.0.0.0
0.0.0.0
Save to EEPROM
IPX Frame Type
Internal IPX Network
: IPX 802.2 FRAME
: AC-B3-00-56
IPX 802.2 FRAME
AC-B3-00-56
IPX 802.2 FRAME
AC-B3-00-56
IP Protocol
IPX Protocol
SNMP Over Ethernet
: ENABLED
: DISABLED
: DISABLED
ENABLED
DISABLED
DISABLED
ENABLED
DISABLED
DISABLED
Segment Name
IP Configuration :
IP Address
Subnet Mask
Gateway IP
Serial IP
IP configuration of segment 1 saved to EEPROM and enabled!
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-10 Segment Configuration Menu
Configuring the System
4-19
Fast EtherHub 3500 System User’s Guide
Menu items are briefly described in the following table.
Field
Segment Name
IP Configuration
IP Address
Subnet Mask
Gateway IP
Serial IP
Save to EEPROM
IPX Frame Type
Internal IPX Network
IP Protocol
IPX Protocol
SNMP over Ethernet
Description
A name you can assign to the segment.
The hub system may be run on SNMP protocol over UDP/IP transport protocol. In this
environment, all systems on the Internet, such as network interconnection devices and
Network Management Stations (e.g., the PC running AccView) are assigned an IP address.
When accessing the hub from a remote site, you will also have to assign an IP address to
the management port.
IP address of the segment you’re managing.
Subnet mask of the agent you’ve selected. This mask identifies the host address bits used
for routing to specific subnets.
Gateway used in passing trap messages from the hub agent to the management station.
IP address used to access the on-board configuration program via an out-of-band SLIP
connection to the management port.
This command saves the IP address for the selected segment in nonvolatile memory, and
makes it effective immediately.
The selected format used on the LAN; i.e., this type is that used by the IPX network where
the hub is installed. If the specified frame type is not detected, the hub will automatically
detect the current type. (Values: 802.3, Ethernet II, SNAP, 802.2)
This address is composed of Net Number which identifies the IPX network number for the
connected slot.
Protocol suite selection.
Protocol suite selection.
Protocol suite selection.
Table 4.9 Segment Configuration Menu
4-20
Configuring the System
Fast EtherHub 3500 System User’s Guide
Configuring Hub Parameters
Use the Hub Configuration menu under the Configuration
Panel to configure any hub in the stack. This menu is used to
configure the repeater and management modules. Use the
following menu to select the required hub, or to change the
numeric identifier for any hub in stack.
Hub Configuration: Hub Selection Menu
Return to Previous Panel
Hub 1 Configuration ...
Hub 2 Configuration ...
Hub 3 Configuration ...
Hub 4 Configuration ...
Hub 5 Configuration ...
Hub 6 Configuration ...
Hub ID Configuration ...
Display or work with hub ID configuration.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-11 Hub Configuration: Hub Selection Menu
Configuring the System
4-21
Fast EtherHub 3500 System User’s Guide
Hub Configuration
To configure a hub, select it from the list shown above. The
following Hub Configuration menu will appear, allowing you to
set parameters for the base repeater unit or the network
management module.
Hub Configuration
Return to Previous Panel
Hub ID
Name
Segment
Status
Power 1
Power 2
:1
: H/W Group
:1
: ATTACHED
: OPERATIONAL
: NOT PRESENT
Position
Type
H/W Ver
F/W Ver
:1
: EH3512M-TX
:0
: 1.05
Network Management Module (NMM) :
Status
: PRIMARY
Segment : 1
Bootup Option : NORMAL
H/W Ver
F/W Ver
:4
: 1.09
Physical Address : 00-04-AC-B3-00-31
Return to previous panel.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-12 Hub Configuration Menu
4-22
Configuring the System
Fast EtherHub 3500 System User’s Guide
Menu items are briefly described in the following table.
Board
(Repeater Unit)
Field
Hub ID
Network
Management
Power 1
Power 2
Position
Type
H/W Ver
F/W Ver
Status
Segment
Module (NMM)
Bootup Option
Description
Hub identifier within the stack. (Up to 6 hubs may be connected via the FlexBus
management channel.)
Any user-defined name for the selected hub.
The hub may be isolated from the backplane or attached to the backplane.
Attach the hub to a specified segment (1 ~ 3). The segment indicator will light up to
show that it has been connected to the specified stack segment.
Shows status of power module in Slot 1 as Operational, Not Present, or Failed.
Shows status of power module in Slot 2 as Operational, Not Present, or Failed.
The physical position in the stack.
Indicates hub type as EH3512I-TX or EH3512M-TX.
Indicates the current hardware version number of the repeater board.
Indicates the current firmware version number of the repeater board.
Defines the status of the Network Management Module as Primary or Backup.
The backplane segment the NMM is attached to. Note that the management agent
does not have to be attached to the same segment as the repeater unit.
Specifies bootup method as -
H/W Ver
F/W Ver
Physical Address
NORMAL - Use on-board ROM code and default IP address.
TFTP DOWNLOAD - Get system code from TFTP server (and use default IP
address).
BOOTP GET IP - Get IP address from server (and use on-board ROM code).
BOOTP DOWNLOAD - Get IP address and system code from server. Image is
stored in temporary memory.
NO BOOTP TFTP REQUEST - Do not issue BOOTP request. Wait for download
via out-of-band.
BOOTP UPGRADE FIRMWARE - Get IP address and system code from server.
Image is stored in nonvolatile memory, and BOOTP option reset to NORMAL. Note
that this is the only in-band option that places the image in nonvolatile memory.
Indicates the current hardware version number for the managment board.
Indicates the current firmware version number for the managment board.
MAC address of the management agent.
Name
Status
Segment
Table 4.10 Hub Configuration Menu
Configuring the System
4-23
Fast EtherHub 3500 System User’s Guide
Hub ID Configuration
To change the numeric hub identifier, select Hub ID
Configuration from the Hub Configuration: Hub Selection
Menu shown above. The following Hub ID Configuration
menu will appear. After changing a hub identifier, verify the
change with the “Enable Above Settings” command.
Hub ID Configuration
Return to Previous Panel
Position
Hub ID
1.
2.
3.
4.
5.
6.
1
2
3
4
5
6
Enable Above Settings
Return to previous panel.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-13 Hub ID Configuration Menu
4-24
Configuring the System
Fast EtherHub 3500 System User’s Guide
Configuring Port Parameters
Use the Port Configuration menu under the Configuration
Panel to configure the ports for any hub in the stack. Select the
port type for the required hub from the following menu.
Port Configuration: Port Selection Menu
Return to Previous Panel
Select port to get configuration
Hub ID |
Port ID
----------+-----------------------1
| 1 through 12 SEM
2
| 1 through 12 SEM
3
| 1 through 12 SEM
4
| 1 through 12 SEM
5
| 1 through 12 SEM
6
| 1 through 12 SEM
Display or work with hub 1 ports 1 through 12 configuration.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-14 Port Configuration: Port Selection Menu
Configuring the System
4-25
Fast EtherHub 3500 System User’s Guide
Configuring Repeater Ports
If you select the repeater port type (i.e., 1 through 12), the Port
Configuration Menu will open. This menu displays the ID and
stack position of the selected hub, and also allows you to
enable/disable any repeater port in the selected hub.
Port Configuration
Return to Previous Panel
Hub ID : 1
Position : 1
Port ID Name
Type
Admin Status Oper Status Link State
1.
100BASE-TX ENABLED ENABLED
DOWN
2.
100BASE-TX ENABLED DISABLED DOWN
3.
100BASE-TX ENABLED ENABLED
DOWN
4.
100BASE-TX ENABLED ENABLED
DOWN
5.
100BASE-TX ENABLED ENABLED
DOWN
6.
100BASE-TX ENABLED ENABLED
DOWN
7.
100BASE-TX ENABLED ENABLED
DOWN
8.
100BASE-TX ENABLED ENABLED
DOWN
9.
100BASE-TX ENABLED ENABLED
DOWN
10.
Steve 100BASE-TX ENABLED ENABLED
UP
11.
100BASE-TX ENABLED ENABLED
DOWN
12.
100BASE-TX ENABLED ENABLED
DOWN
Partition
NOT PART
NOT PART
NOT PART
NOT PART
NOT PART
NOT PART
NOT PART
NOT PART
NOT PART
NOT PART
NOT PART
NOT PART
Return to previous panel.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-15 Port Configuration Menu
Menu items are briefly described in the following table.
Field
Hub ID
Position
Port ID
Name
Type
Admin Status1
Oper Status1
Link State
Partition
Description
Hub identifier within the stack.
The physical position in the stack (as determined by its position from the top of the FlexBus chain).
Numeric identifier 1~12 or SEM (i.e., SmartExtender Module).
User-defined name for selected port.
Connection type for the repeater Ports 1~12 is 100BASE-TX.
Any port may be set by the operator to ENABLED or DISABLED.
Reflects the port’s actual status as ENABLED or DISABLED.
Indicates if the port has a valid connection to an external device.
Indicates if the port is partitioned. (Refer to Partition/Disable Indicators in Chapter 5 for a more
detailed description of the reasons a port may be partitioned.)
1 - If the port is set to ENABLED by the administrator, but used as a backup port, Admin Status and Oper Status will differ.
Table 4.11 Port Configuration Menu
4-26
Configuring the System
Fast EtherHub 3500 System User’s Guide
Configuring the SmartExtender Module
If you select the SmartExtender Module (i.e., SEM), the SEM
Port Configuration Menu will open. This menu allows you to
configure various communication parameters for this module.
SEM Port Configuration
Return to Previous Panel
Hub ID : 1
Port ID : SEM
Position : 1
Name
: Uplink
Link State
: UP
Type
: 100BASE-TX
Speed
: 10M
Admin Status : ENABLED
Oper Status
: ENABLED
Duplex Mode : HALF-DUPLEX
Duplex In Use : HALF-DUPLEX
Back Pressure : DISABLED
Forwarding Mode : STORE AND FORWARD
Forwarding In Use : STORE AND FORWARD
Return to previous panel.
Use arrow keys to move. <Enter> to make changes.
<Ctrl+T> to return to Main Menu.
Figure 4-16 SEM Port Configuration Menu
Configuring the System
4-27
Fast EtherHub 3500 System User’s Guide
Menu items are briefly described in the following table.
Field
Hub ID
Position
Port ID
Name
Link State
Type
Description
Hub identifier within the stack.
The physical position in the stack (as determined by its position from the top of the FlexBus chain).
Identifies this port as the SmartExtender Module.
User-defined name for selected port.
Indicates if the port has a valid connection to an external device.
Connection types for the SmartExtender Module include 100BASE-TX (10BASE-T), 100BASE-T4,
100BASE-FX.
Speed
The 100BASE-TX module relies on auto-detection to set the speed at 10 or 100 Mbps, while the
100BASE-T4 and 100BASE-FX modules are fixed at 100 Mbps.
Admin Status1
Any port may be set by the operator to ENABLED or DISABLED.
Oper Status1
Reflects the port’s actual status as ENABLED or DISABLED.
Duplex Mode
The extender module for 100BASE-TX (10BASE-T) and 100BASE-FX can be set to half or full duplex.
Duplex In Use
Displays the actual duplex mode in use based on the results of auto-negotiation.
Back Pressure
When the internal buffers on this port begin to fill, it can be configured to signal the connected
device to slow transmission by setting this field to ENABLED.
Forwarding Mode
The scheme by which frames are processed and forwarded through this module can be set to
Adaptive Cut-through or Store and Forward.
Forwarding In Use Indicates the actual forwarding mode in use based on the current error rate.
1 - If the port is set to ENABLED by the administrator, but used as a backup port, Admin Status and Oper Status will differ.
Table 4.12 SEM Port Configuration Menu
4-28
Configuring the System
Fast EtherHub 3500 System User’s Guide
Defining Backup Ports
Use the Port Backups menu under the Configuration Panel to
define up to 6 master/slave port pairs. If the connection to the
master port fails, the slave port will automatically take over.
For greater reliability, primary and secondary ports should be
located on different hubs. Use the following menu to specify
and activate port backup pairs.
Backup Set
1.
2.
3.
4.
5.
6.
Port Backups
Return to Previous Panel
Primary Port
Secondary Port
Hub: 1 Port: 1
Hub: 1 Port: 1
Hub: 1 Port: 4
Hub: 1 Port: 1
Hub: 1 Port: 1
Hub: 1 Port: 1
Hub: 1 Port: 1
Hub: 1 Port: 1
Hub: 1 Port: 1
Hub: 1 Port: 2
Hub: 1 Port: 2
Hub: 1 Port: 1
Action
INACTIVE
INACTIVE
INACTIVE
INACTIVE
INACTIVE
INACTIVE
Return to previous panel.
Use arrow keys to move. <Enter> to make changes.
<Ctrl+T> to return to Main Menu.
Figure 4-17 Port Backups Menu
Menu items are briefly described in the following table.
Field
Backup Set
Primary Port
Hub
Port
Secondary Port
Hub
Port
Action
Description
Identifier for up to 18 backup port pairs.
Pair member serving as the primary link.
Hub ID for the master port.
Port identifier for the master port.
Pair member serving as the backup link.
Hub ID for the slave port.
Port identifier for the slave port.
Each backup pair can be set to ACTIVE or INACTIVE.
BACKUP is displayed if the primary port is not currently linked.
STAND-BY is displayed if the backup port is not currently linked.
Table 4.13 Port Backups Menu
Configuring the System
4-29
Fast EtherHub 3500 System User’s Guide
Port Intrusion Control
Use the Port Intrusion Control menu under the Configuration
Panel to restrict access for any port to an authorized source
address. Select the required hub from the following menu.
Port Intrusion Control: Hub Selection Menu
Return to Previous Panel
Hub 1 Port Intrusion Control ...
Hub 2 Port Intrusion Control ...
Hub 3 Port Intrusion Control ...
Hub 4 Port Intrusion Control ...
Hub 5 Port Intrusion Control ...
Hub 6 Port Intrusion Control ...
Return to previous panel.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-18 Port Intrusion Control: Hub Selection Menu
4-30
Configuring the System
Fast EtherHub 3500 System User’s Guide
Use the Port Intrusion Control Menu to define the MAC
address for the device authorized to access a port, and set the
response type, as shown in the following example.
Port Intrusion Control
Return to Previous Panel
Hub ID : 1
Port ID
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Position : 1
Authorized Address
00-00-00-00-00-00
00-00-00-00-00-00
00-00-00-00-00-00
00-00-00-00-00-00
00-00-00-00-00-00
00-00-00-00-00-00
00-00-00-00-00-00
00-00-00-00-00-00
00-00-00-00-00-00
00-00-E8-90-1B-73
00-00-00-00-00-00
00-00-00-00-00-00
Intrusion Action
INACTIVE
INACTIVE
INACTIVE
INACTIVE
INACTIVE
INACTIVE
INACTIVE
INACTIVE
INACTIVE
WARNING & DISABLE
INACTIVE
INACTIVE
Return to previous panel.
Use arrow keys to move. <Enter> to make changes.
<Ctrl+T> to return to Main Menu.
Figure 4-19 Port Intrusion Control Menu
Menu items are briefly described in the following table.
Field
Hub ID
Position
Port
Authorized Address
Intrusion Action
Description
Hub identifier within the stack.
The physical position in the stack (as determined by its position from the top of the FlexBus chain).
Selects any station port (1~12) on the hub.
Defines the MAC address that is authorized to attach to this port.
Response to a detected intrusion can be set to:
INACTIVE - no action taken,
WARNING - trap message is issued to the management station, or
WARNING & DISABLE - trap message is issued and port is disabled.
Note: If a port is disabled by an unauthorized intrusion attempt, it must be manually re-enabled
using the Oper Status field in the Port Configuration menu.
Table 4.14 Port Intrusion Control Menu
Configuring the System
4-31
Fast EtherHub 3500 System User’s Guide
Downloading System Software via a TFTP Server
Use the TFTP Download command under the Configuration
Panel to download firmware updates into the hub. You may
upgrade firmware from a server attached to the local network,
or remotely via a serial link using TFTP over SLIP.
Specify the IP address for the TFTP server, the filename, and
the download mode. The download file should be a binary file
from Accton; otherwise the agent will not accept it. Also be
sure that you have already set the required bootup option for the
target hub under the Hub Configuration menu.
Download status is indicated by messages at the bottom of the
screen. Firmware is first loaded into a temporary buffer. If you
selected download for permanent use, it will then be transferred
to nonvolatile memory. After you download the firmware, the
agent will be reset and you will have to log back into the configuration program again. The following screen shows an
example of the TFTP download menu.
TFTP Download
Return to Previous Panel
Download Server IP : 203.70.236.12
Download Filename : acc110.bin
Download Mode
: PERMANENT
Start TFTP Download
Return to previous panel.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-20 TFTP Download Menu
4-32
Configuring the System
Fast EtherHub 3500 System User’s Guide
Menu items are briefly described in the following table.
Field
Download Server IP
Download Filename
Download Mode
Description
IP address of a TFTP server. (TFTP stands for Trivial File Transfer Protocol.)
The *.bin file to download.
You can download to permanent flash ROM or temporary storage in RAM (for test purposes).
However, if you download to temporary memory, this firmware will be lost upon power off. To
update new agent firmware for permanent use, it must be downloaded to flash ROM.
Start TFTP Download Initiates download process.
Table 4.15 TFTP Download Menu
Configuring the System
4-33
Fast EtherHub 3500 System User’s Guide
Xmodem Download
Use the Xmodem Download menu under the Configuration
Panel to download firmware to the hub. The Xmodem protocol
is used to transfer binary files over a PC connection (i.e., using
terminal emulation or modem access software).
Specify the download mode and select Process Download.
Open the file transfer utility in your terminal emulation or
modem access program, specify the filename, and then start file
transfer. When transferring files from you computer, be sure you
specify “Send” or “Upload” file. The file should be a binary file
from Accton; otherwise the agent will not accept it. Also be
sure that you have already set the required bootup option for the
target hub under the Hub Configuration menu.
File transfer status is indicated by messages at the bottom of the
screen. Firmware is first loaded into a temporary buffer. If you
selected download for permanent use, it will then be transferred
to nonvolatile memory. After you finish transfering the firmware,
the agent will be reset and you will have to log back into the
configuration program again. The following screen shows an
example of the Xmodem Download menu.
Xmodem Download
Return to Previous Panel
Download Mode : TEMPORARY
Process Download
Return to previous panel.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-21 Xmodem Download Menu
Menu items are briefly described in the following table.
Field
Download Mode
Process Download
Description
You can download to permanent flash ROM or temporary storage in RAM (for test purposes only).
Initiate the file transfer process.
Table 4.16 Xmodem Download Menu
4-34
Configuring the System
Fast EtherHub 3500 System User’s Guide
Changing User Passwords
The on-board configuration program includes two fixed user
types, including Admin and Guest. The access privilege is
Read/Write for administrator and Read Only for guest. The
default user names are “admin” and “guest,” without passwords.
The administrator is the only user with write access for agent
parameters. You should therefore assign a password to
administrator as soon as possible, and store it in a safe place.
The User Passwords menu is shown below.
User Passwords
Return to Previous Panel
User Type
Admin
Guest
User Name
: admin
: guest
Password
pluto
Return to previous panel.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-22 User Passwords Menu
Menu items are briefly described in the following table.
Field
User Type
User Name
Password
Description
There are only two fixed user types - Admin and Guest. The respective access rights are
Read/Write and Read Only.
The login name required for access to the management agent.
(not case sensitive)
The password that must be provided with the user name to access the system. (not case sensitive)
Table 4.17 User Passwords Menu
Configuring the System
4-35
Fast EtherHub 3500 System User’s Guide
Console Lockout
This function instructs the configuration program to
automatically lock the console if no keyboard input is detected
for the defined delay time. The Console Lockout menu is
shown below.
Console Lockout
Return to Previous Panel
Status
: ON
Delay Time : 20 Minutes
Return to previous panel.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-23 Console Lockout Menu
Menu items are briefly described in the following table.
Field
Status
Delay Time
Description
The console lockout feature can be turned on or off.
The delay time for console lockout can set for any value in the range of 0 ~ 99 minutes.
Table 4.18 Console Lockout Menu
4-36
Configuring the System
Fast EtherHub 3500 System User’s Guide
Segment Statistics
Displays statistics for the stack’s segments. These values can
be used to indicate the approximate load balance in your stack.
If the loading is severly unbalanced, you may consider
adjusting your network connections or segment assignments.
The Segment Statistics window is shown below.
Screen statistics are not
automatically refreshed from the
agent. Select Refresh Statistics
to update the displayed values.
Segment Statistics
Return to Previous Panel
Refresh Statistics
The values displayed have been
accumulated since the last
system reboot or counter reset.
Segment 1
Frames
Bytes
Collisions
Alignment Errors
CRC Errors
Total Errors
Symbol Errors
:
:
:
:
:
:
:
19271
3767321
57
0
0
0
0
Segment 2
Segment 3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Return to previous panel.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-24 Segment Statistics Window
Displayed items are briefly described in the following table.
Field
Refresh Statistics
Frames
Bytes
Collisions
Alignment Errors
CRC Errors
Total Errors
Symbol Errors
Description
Fetch the current statistics stored in the agent’s counters.
Number of frames passing through this device.
Number of bytes passing through this device.
Number of simultaneous node transmissions detected by this device.
Number of mis-synchronized data packets detected by this device.
Number of Ethernet Cyclic Redundancy Check errors detected by this device.
Total number of errors, including FCS, alignment, FramesTooLong, ShortEvents,
LateEvents, Jabber, and DataRateMismatches detected on this device.
Number of symbol errors (i.e., code-group errors including collision artifacts or transmission
errors). Note that these errors are unique to 100 Mbps analog signals.
Table 4.19 Segment Statistics Menu
Configuring the System
4-37
Fast EtherHub 3500 System User’s Guide
Hub Statistics
Displays statistics for any hub in the stack. Select the required
hub from the following menu.
Hub Statistics: Hub Selection Menu
Return to Previous Panel
Hub 1 Statistics ...
Hub 2 Statistics ...
Hub 3 Statistics ...
Hub 4 Statistics ...
Hub 5 Statistics ...
Hub 6 Statistics ...
Return to previous panel.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-25 Hub Statistics: Hub Selection Menu
Hub statistics can be used to check on the general health of
your hardware and network connections. If any of the error
indications are extremely high (e.g., collisions or CRC errors),
you should take appropriate measure to resolve the problem.
Screen statistics are not
automatically refreshed from the
agent. Select Refresh Statistics
to update the displayed values.
The values displayed have been
accumulated since the last
system reboot or counter reset.
Hub Statistics
Return to Previous Panel
Refresh Statistics
Hub ID : 1
Position : 1
Frames
Bytes
Collisions
Alignment Errors
CRC Errors
Total Errors
Symbol Errors
:
:
:
:
:
:
:
20116
3860016
64
0
0
0
0
Return to previous panel.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-26 Hub Statistics Window
4-38
Configuring the System
Fast EtherHub 3500 System User’s Guide
Displayed items are briefly described in the following table.
Field
Hub ID
Position
Frames
Bytes
Collisions
Alignment Errors
CRC Errors
Total Errors
Symbol Errors
Description
Hub identifier within the stack.
The physical position in the stack (as determined by its position from the top of the FlexBus chain).
Number of frames passing through this device.
Number of bytes passing through this device.
Number of simultaneous node transmissions detected by this device.
Number of mis-synchronized data packets detected by this device.
Number of Ethernet Cyclic Redundancy Check errors detected by this device.
Total number of errors, including FCS, alignment, FramesTooLong, ShortEvents, LateEvents,
Jabber, and DataRateMismatches detected on this device.
Number of symbol errors (i.e., code-group errors including collision artifacts or transmission errors).
Note that these errors are unique to 100 Mbps analog signals.
Table 4.20 Hub Statistics Menu
Port Statistics
Displays statistics for any port in the stack. Select the required
port from the following menu.
Port Statistics: Port Selection Menu
Return to Previous Panel
Select port to get statistics
Hub ID |
Port ID
---------+------------------------------------------------1 | 1 2 3 4 5 6 7 8 9 10 11 12 SEM
2 | 1 2 3 4 5 6 7 8 9 10 11 12 SEM
3 | 1 2 3 4 5 6 7 8 9 10 11 12 SEM
4 | 1 2 3 4 5 6 7 8 9 10 11 12 SEM
5 | 1 2 3 4 5 6 7 8 9 10 11 12 SEM
6 | 1 2 3 4 5 6 7 8 9 10 11 12 SEM
Return to previous panel.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-27 Port Statistics: Port Selection Menu
Configuring the System
4-39
Fast EtherHub 3500 System User’s Guide
Statistics for Repeater Ports
Statistics for repeater ports covers a wide range of Ethernet
variables. If any of the error indications are extremely high,
there may be a problem with the port, the attached device, or
the network cabling. (The System Diagnostics section in Appendix
A provides help on troubleshooting.) The Port Statistics
window is shown below.
Screen statistics
are not
automatically
refreshed from the
agent. Select
Refresh Statistics
to update the
displayed values.
The values
displayed have
been accumulated
since the last
system reboot or
counter reset.
Port Statistics
Return to Previous Panel
Refresh Statistics
Hub ID : 1
Port ID : 10
Readable Frames
Readable Octets
FCS Errors
Alignment Errors
Frames Too Long
Short Events
Runts
Collisions
Position : 1
:
20524
: 3904366
:
0
:
0
:
0
:
0
:
2
:
65
Late Events
:
0
Data Rate Mismatches :
0
Auto Partitions
:
0
Total Errors
:
0
LSA Changes
:
1
Last Source Address : 00-00-E8-90-1B-73
Symbol Errors
:
0
Return to previous panel.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-28 Port Statistics Menu
4-40
Configuring the System
Fast EtherHub 3500 System User’s Guide
Displayed items are briefly described in the following table.
Field
Hub ID
Position
Port ID
Readable Frames
Readable Octets
FCS Errors
Alignment Errors
Frames Too Long
Short Events
Runts
Collisions
Late Events
Data Rate Mis.
Auto Partitions
Total Errors
LSA Changes
Last Source Addr.
Symbol Errors
Description
Hub identifier within the stack.
The physical position in the stack (as determined by its position from the top of the FlexBus chain).
Port identifier on the hub.
Number of good frames received.
Number of good octets received.
Number of Frame Control Sequence errors.
Number of mis-synchronized data packets detected by this device.
Number of times frame length has exceeded the maximum allowable size (i.e., 1518 bytes).
Number of short fragments.
Number of fragments (that were too long to qualify as short events).
Number of simultaneous node transmissions detected by this device.
Number of frames where a collision occurred late in the transmission.
Number of frames for which the data rate does not match the local frequency.
Number of times this port has been automatically partitioned due to jabber.
Total number of errors, including FCS, alignment, FramesTooLong, ShortEvents, LateEvents,
Jabber, and DataRateMismatches detected on this device.
Number of times the source address has changed.
Last source address.
Number of symbol errors (i.e., code-group errors including collision artifacts or transmission errors).
Note that these errors are unique to 100 Mbps analog signals.
Table 4.21 Port Statistics Menu
Configuring the System
4-41
Fast EtherHub 3500 System User’s Guide
Statistics for SmartExtender Module
Statistics for the SmartExtender Module includes the basic
Ethernet variables shown below.
Screen statistics are not
automatically refreshed from the
agent. Select Refresh Statistics
to update the displayed values.
The values displayed have been
accumulated since the last
system reboot or counter reset.
SEM Port Statistics
Return to Previous Panel
Refresh Statistics
Hub ID : 1
Port ID : SEM
In Frames
In Octets
In Discarded
Out Frames
Out Octets
Out Discarded
Position : 1
:
4265954
: 842532471
:
744817
:
24808
:
4432038
:
1202
FCS Errors
Frames Too Long
Runts
Collisions
:
:
:
:
52
0
33
11678
Return to previous panel.
Use arrow keys to move. <Enter> to confirm.
<Ctrl+T> to return to Main Menu.
Figure 4-29 SEM Port Statistics Menu
Displayed items are briefly described in the following table.
Field
Hub ID
Position
Port ID
In Frames
In Octets
In Discarded
Out Frames
Out Octets
Out Discarded
FCS Errors
Frames Too Long
Runts
Collisions
Description
Hub identifier within the stack.
The physical position in the stack (as determined by its position from the top of the FlexBus chain).
Port identifier on the hub.
Number of frames received.
Number of octets received.
Number of frames received and filtered.
Number of frames transmitted.
Number of octets transmitted.
Number of frames transmitted and filtered (i.e., at the repeater to SEM interface).
Number of Frame Control Sequence errors.
Number of times frame length has exceeded the maximum allowable size (i.e., 1518 bytes)
Number of fragments (that were too long to qualify as short events).
Number of simultaneous node transmissions detected by this device.
Table 4.22 SEM Port Statistics Menu
4-42
Configuring the System
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