advertisement
VH-8g.book Page -i Friday, November 17, 2000 5:29 PM
VERTICAL HORIZON
VH-8G
GIGABIT ETHERNET SWITCH
USER GUIDE
9033639
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Notice
Only qualified personnel should perform installation procedures.
NOTICE
Enterasys Networks reserves the right to make changes in specifications and other information contained in this document without prior notice. The reader should in all cases consult Enterasys
Networks to determine whether any such changes have been made.
The hardware, firmware, or software described in this manual is subject to change without notice.
IN NO EVENT SHALL ENTERASYS NETWORKS BE LIABLE FOR ANY INCIDENTAL,
INDIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING BUT
NOT LIMITED TO LOST PROFITS) ARISING OUT OF OR RELATED TO THIS MANUAL OR
THE INFORMATION CONTAINED IN IT, EVEN IF ENTERASYS NETWORKS HAS BEEN
ADVISED OF, KNOWN, OR SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH
DAMAGES.
2000 by Enterasys Networks, Inc., P.O. Box 5005, Rochester, NH 03866-5005
All Rights Reserved
Printed in Taiwan, R.O.C.
Order Number: 9033639 November 2000
Enterasys, Enterasys Networks, and Vertical Horizon are trademarks or registered trademarks of
Enterasys Networks, Inc.
Microsoft, Windows, Windows 95, Windows 98, and Windows NT are either trademarks or registered trademarks of Microsoft Corporation.
Netscape and Netscape Navigator are trademarks of Netscape Communications Corporation.
All other product names mentioned in this manual may be trademarks or registered trademarks of their respective companies.
9033639 i
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Notice
FCC NOTICE
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
This equipment uses, generates, and can radiate radio frequency energy and if not installed in accordance with the operator’s manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause interference in which case the user will be required to correct the interference at his own expense.
WARNING: Changes or modifications made to this device which are not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
INDUSTRY CANADA NOTICE
This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of
Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de la class A prescrites dans le Règlement sur le brouillage radioélectrique
édicté par le ministère des Communications du Canada.
VCCI NOTICE
This is a Class A product based on the standard of the Voluntary Control Council for Interference by
Information Technology Equipment (VCCI). If this equipment is used in a domestic environment, radio disturbance may arise. When such trouble occurs, the user may be required to take corrective actions.
SAFETY INFORMATION
CLASS 1 LASER TRANSCEIVERS
The VH-8G 8-port switch uses Class 1 Laser transceivers. Read the following safety information before installing or operating these modules.
Class 1 laser transceivers use an optical feedback loop to maintain Class 1 operation limits. This control loop eliminates the need for maintenance checks or adjustments. The output is factory set, and does not allow any user adjustment. Class 1 Laser transceivers comply with the following safety standards: ii 9033639
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Notice
• 21 CFR 1040.10 and 1040.11 U.S. Department of Health and Human Services (FDA).
• IEC Publication 825 (International Electrotechnical Commission).
• CENELEC EN 60825 (European Committee for Electrotechnical Standardization).
• When operating within their performance limitations, laser transceiver output meets the Class 1 accessible emission limit of all three standards. Class 1 levels of laser radiation are not considered hazardous.
SAFETY INFORMATION
CLASS 1 LASER TRANSCEIVERS
LASER RADIATION AND CONNECTORS
When the connector is in place, all laser radiation remains within the fiber. The maximum amount of radiant power exiting the fiber (under normal conditions) is -12.6 dBm or 55 x 10
-6
watts.
Removing the optical connector from the transceiver allows laser radiation to emit directly from the optical port. The maximum radiance from the optical port (under worst case conditions) is 0.8 W cm
-2 or 8 x 10
3
W m
2
sr
-1
.
Do not use optical instruments to view the laser output. The use of optical instruments to view laser output increases eye hazard. When viewing the output optical port, power must be removed from the switch.
WARNING: FIBER OPTIC PORT SAFETY
When using a fiber optic port, never look at the transmit laser while it is powered on. Also, never look directly at the fiber TX port and fiber cable ends when they are powered on.
AVERTISSMENT: PORTS POUR FIBRES OPTIQUES -
SÉCURITÉ SUR LE PLAN OPTIQUE
Ne regardez jamais le laser tant qu'il est sous tension. Ne regardez jamais directement le port TX (Transmission) à fibres optiques et les embouts de câbles à fibres optiques tant qu'ils sont sous tension.
WARNHINWEIS: FASEROPTIKANSCHLÜSSE -
OPTISCHE SICHERHEIT
Niemals ein Übertragungslaser betrachten, während dieses eingeschaltet ist.
Niemals direkt auf den Faser-TX-Anschluß und auf die Faserkabelenden schauen, während diese eingeschaltet sind.
9033639 iii
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Notice
SAFETY INFORMATION
WICHTIGE SICHERHEITSHINWEISE (GERMANY)
1. Bitte lesen Sie diese Hinweise sorgfältig durch.
2. Heben Sie diese Anleitung für den späteren Gebrauch auf.
3. Vor jedem Reinigen ist das Gerät vom Stromnetz zu trennen. Verwenden Sie keine Flüssigoder
Aerosolreiniger. Am besten eignet sich ein angefeuchtetes Tuch zur Reinigung.
6. Bei der Aufstellung des Gerätes ist auf sicheren Stand zu achten. Ein Kippen oder Fallen könnte Beschädigungen hervorrufen.
Sorgen Sie dafür, daß diese Öffnungen nicht abgedeckt werden.
8. Beachten Sie beim Anschluß an das Stromnetz die Anschlußwerte.
9. Verlegen Sie die Netzanschlußleitung so, daß niemand darüber fallen kann. Es sollte auch nichts auf der Leitung abgestellt werden.
10.
Alle Hinweise und Warnungen, die sich am Gerät befinden, sind zu beachten.
11.
Wird das Gerät über einen längeren Zeitraum nicht benutzt, sollten Sie es vom Stromnetz trennen. Somit wird im Falle einer Überspannung eine Beschädigung vermieden.
12.
Durch die Lüftungsöffnungen dürfen niemals Gegenstände oder Flüssigkeiten in das Gerät gelangen. Dies könnte einen Brand bzw. elektrischen Schlag auslösen.
13.
Öffnen sie niemals das Gerät. Das Gerät darf aus Gründen der elektrischen Sicherheit nur von authorisiertem Servicepersonal geöffnet werden.
14.
Wenn folgende Situationen auftreten ist das Gerät vom Stromnetz zu trennen und von einer qualifizierten Servicestelle zu überprüfen: a. Netzkabel oder Netzstecker sind beschädigt.
b. Flüssigkeit ist in das Gerät eingedrungen.
c. Das Gerät war Feuchtigkeit ausgesetzt.
d. Wenn das Gerät nicht der Bedienungsanleitung entsprechend funktioniert oder Sie mit Hilfe dieser Anleitung keine Verbesserung erzielen.
e. Das Gerät ist gefallen und/oder das Gehäuse ist beschädigt.
f. Wenn das Gerät deutliche Anzeichen eines Defektes aufweist.
bis 6A und einem Gerätegewicht größer 3kg ist eine Leitung nicht leichter als H05VV-F, 3G,
0.75mm
2
einzusetzen.
Der arbeitsplatzbezogene Schalldruckpegel nach DIN 45 635 Teil 1000 beträgt 70dB(A) oder weniger.
iv 9033639
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Notice
ENTERASYS NETWORKS, INC.
PROGRAM LICENSE AGREEMENT
BEFORE OPENING OR UTILIZING THE ENCLOSED PRODUCT,
CAREFULLY READ THIS LICENSE AGREEMENT.
This document is an agreement (“Agreement”) between You, the end user, and Enterasys Networks,
Inc. (“Enterasys”) that sets forth your rights and obligations with respect to the Enterasys software program (“Program”) in the package. The Program may be contained in firmware, chips or other media. UTILIZING THE ENCLOSED PRODUCT, YOU ARE AGREEING TO BECOME BOUND
BY THE TERMS OF THIS AGREEMENT, WHICH INCLUDES THE LICENSE AND THE
LIMITATION OF WARRANTY AND DISCLAIMER OF LIABILITY. IF YOU DO NOT AGREE
TO THE TERMS OF THIS AGREEMENT, RETURN THE UNOPENED PRODUCT TO
ENTERASYS OR YOUR DEALER, IF ANY, WITHIN TEN (10) DAYS FOLLOWING THE DATE
OF RECEIPT FOR A FULL REFUND.
IF YOU HAVE ANY QUESTIONS ABOUT THIS AGREEMENT, CONTACT ENTERASYS
NETWORKS (603) 332-9400. Attn: Legal Department.
1.
LICENSE . You have the right to use only the one (1) copy of the Program provided in this package subject to the terms and conditions of this License Agreement.
You may not copy, reproduce or transmit any part of the Program except as permitted by the
Copyright Act of the United States or as authorized in writing by Enterasys.
2.
OTHER RESTRICTIONS . You may not reverse engineer, decompile, or disassemble the
Program.
3.
APPLICABLE LAW . This License Agreement shall be interpreted and governed under the laws and in the state and federal courts of New Hampshire. You accept the personal jurisdiction and venue of the New Hampshire courts.
4.
EXPORT REQUIREMENTS . You understand that Enterasys and its Affiliates are subject to regulation by agencies of the U.S. Government, including the U.S. Department of Commerce, which prohibit export or diversion of certain technical products to certain countries, unless a license to export the product is obtained from the U.S. Government or an exception from obtaining such license may be relied upon by the exporting party.
If the Program is exported from the United States pursuant to the License Exception CIV under the U.S. Export Administration Regulations, You agree that You are a civil end user of the Program and agree that You will use the Program for civil end uses only and not for military purposes.
If the Program is exported from the United States pursuant to the License Exception TSR under the U.S. Export Administration Regulations, in addition to the restriction on transfer set forth in
Sections 1 or 2 of this Agreement, You agree not to (i) reexport or release the Program, the source code for the Program or technology to a national of a country in Country Groups D:1 or E:2 (Albania,
Armenia, Azerbaijan, Belarus, Bulgaria, Cambodia, Cuba, Estonia, Georgia, Iraq, Kazakhstan,
Kyrgyzstan, Laos, Latvia, Libya, Lithuania, Moldova, North Korea, the People’s Republic of China,
Romania, Russia, Rwanda, Tajikistan, Turkmenistan, Ukraine, Uzbekistan, Vietnam, or such other countries as may be designated by the United States Government), (ii) export to Country Groups D:1 or E:2 (as defined herein) the direct product of the Program or the technology, if such foreign produced direct product is subject to national security controls as identified on the U.S. Commerce
Control List, or (iii) if the direct product of the technology is a complete plant or any major component of a plant, export to Country Groups D:1 or E:2 the direct product of the plant or a major component thereof, if such foreign produced direct product is subject to national security controls as identified on the U.S. Commerce Control List or is subject to State Department controls under the
U.S. Munitions List.
9033639 v
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Notice
5.
UNITED STATES GOVERNMENT RESTRICTED RIGHTS . The enclosed Product (i) was developed solely at private expense; (ii) contains “restricted computer software” submitted with restricted rights in accordance with section 52.227-19 (a) through (d) of the Commercial Computer
Software-Restricted Rights Clause and its successors, and (iii) in all respects is proprietary data belonging to Enterasys and/or its suppliers. For Department of Defense units, the Product is considered commercial computer software in accordance with DFARS section 227.7202-3 and its successors, and use, duplication, or disclosure by the Government is subject to restrictions set forth herein.
6.
EXCLUSION OF WARRANTY . Except as may be specifically provided by Enterasys in writing, Enterasys makes no warranty, expressed or implied, concerning the Program (including its documentation and media).
ENTERASYS DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUPPLIED TO
YOU BY ENTERASYS IN WRITING, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE, WITH RESPECT TO THE PROGRAM, THE ACCOMPANYING
WRITTEN MATERIALS, AND ANY ACCOMPANYING HARDWARE.
7.
NO LIABILITY FOR CONSEQUENTIAL DAMAGES . IN NO EVENT SHALL
ENTERASYS OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER
(INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS, PROFITS,
BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, SPECIAL, INCIDENTAL,
CONSEQUENTIAL, OR RELIANCE DAMAGES, OR OTHER LOSS) ARISING OUT OF THE
USE OR INABILITY TO USE THIS ENTERASYS PRODUCT, EVEN IF ENTERASYS HAS
BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. BECAUSE SOME STATES DO
NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR
INCIDENTAL DAMAGES, OR IN THE DURATION OR LIMITATION OF IMPLIED
WARRANTIES IN SOME INSTANCES, THE ABOVE LIMITATION AND EXCLUSIONS MAY
NOT APPLY TO YOU.
vi 9033639
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Notice
DECLARATION OF CONFORMITY
Application of Council Directive(s): 89/336/EEC
73/23/EEC
Manufacturer’s Name: Enterasys Networks, Inc.
Manufacturer’s Address: 35 Industrial Way
PO Box 5005
Rochester, NH 03867
European Representative Name: Mr. J. Sims
European Representative Address: Enterasys Networks Limited
Nexus House, Newbury Business Park
London Road, Newbury
Berkshire RG14 2PZ, England
Conformance to Directive(s)/Product Standards: EC Directive 89/336/EEC
EC Directive 73/23/EEC
EN 55022
EN 50082-1
EN 60950
Equipment Type/Environment: Networking Equipment, for use in a
Commercial or Light Industrial
Environment.
We the undersigned, hereby declare, under our sole responsibility, that the equipment packaged with this notice conforms to the above directives.
Manufacturer Legal Representative in Europe
Full Name
Title
Location
Full Name
Title
Location
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Notice viii 9033639
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TABLE OF CONTENTS
PREFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . XI
Purpose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xi
Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xi
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xi
Message Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xi
Keyboard Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xi
Other Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
1. PRODUCT OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Feature Summaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
IEEE 802.1D Bridge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Spanning Tree Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Frame Buffering and Frame Latency . . . . . . . . . . . . . . . . . . . . . . . . 5
Software Download . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Non-volatile Parameter Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Configuration and Management Interfaces . . . . . . . . . . . . . . . . . . . 6
RMON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Port Mirroring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
BootP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Full-Duplex Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Flow Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Virtual LANs (VLANs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Class of Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Port Trunking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Factory Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Application Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Client/Server Network Application . . . . . . . . . . . . . . . . . . . . . . . . . 11
Backbone Consolidation Application . . . . . . . . . . . . . . . . . . . . . . . 12
2. INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Inspecting Your Shipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Site Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Mounting the Switch on a Table or Shelf . . . . . . . . . . . . . . . . . . . . . . . 14
Mounting the Switch in a Rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Connecting a Terminal to the Console Port . . . . . . . . . . . . . . . . . . . . . 16
Console Port (Out-of-Band) Connections . . . . . . . . . . . . . . . . . . . 16
In-Band Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Powering the Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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Network Cable Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Fiber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1000Base-SX Fiber Ports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
APPENDIX A. TECHNICAL SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . 21
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Standards Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Regulatory Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Data Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Physical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Port Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Console Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Power Cord Set Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
General Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Country-Specific Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . 24
APPENDIX B. FLOW CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
APPENDIX C. ACRONYMS & ABBREVIATIONS . . . . . . . . . . . . . . . . . . . . . . 29
INDEX x Table of Contents VH-8G
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PREFACE
Purpose
This guide provides information about the features and applications of the
Enterasys Networks Vertical Horizon VH-8G switch system.
Audience
This guide is intended for Ethernet Local Area Network (LAN) administrators and Management Information Systems (MIS) personnel with the following background:
• Working knowledge of Ethernet LANs
• Familiarity with Transmission Control Protocol/Internet Protocol
(TCP/IP) and Simple Network Management Protocol (SNMP)
Conventions
This section describes the conventions used in this guide.
Message Formats
Two types of messages, identified by icons, appear in the text:
A note informs you of special circumstances.
A caution indicates the possibility of equipment damage.
Keyboard Entries
This guide uses the following conventions for keyboard entries:
• When you read “enter,” type the text and press the [Enter] key.
• Example: Enter the Gateway IP address and press the [Enter] key.
• When you read “select,” highlight the menu item and press the [Enter] key.
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Other Conventions
This guide uses the following typographical conventions:
• Initial Caps Menu titles and console menu selections.
• [Enter]
• courier font
Used to designate the Enter or Return key.
Screen messages and user prompts.
• Selection
• Field
Describes a user-configurable user interface item.
Describes a read-only information item.
Organization
Chapter 1. Product Overview : Describes the features of the switch, front and rear panel components and application examples.
Chapter 2. Installation : Describes the content of your switch shipment, lists site requirements, and provides mounting instructions. Instructions for making connections and powering up the switch are provided as well.
Appendix A. Technical Specifications : Provides a list of standards compliance and certifications as well as physical and operational specifications.
Appendix B. Flow Control : Describes how the flow control features are used to provide a mechanism for protecting the switch from overload conditions and to keep additional traffic off the network.
Appendix C.
Acronyms and Abbreviations : Provides definitions for a list of common acronyms and abbreviations used within the installation guide and the networking industry.
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1. PRODUCT OVERVIEW
This chapter provides the following information:
• Product Description
• Features
• Front and Rear Panel Component Descriptions
• Feature Summaries
• Application Example
Description
This installation guide describes Enterasys’ VH-8G Gigabit Ethernet switch. This switch provides 8 1000Base-SX ports and includes an
SNMP-based management agent with support for both in-band and outof-band access for managing the switch.
The switch employs a high-speed switching fabric. This design allows for simultaneous transport of multiple packets at low latency on all ports. It also uses store-and-forward switching to ensure maximum data integrity.
In this mode, the entire packet must be received into a port buffer and checked for validity before being forwarded. This prevents errors from being propagated throughout the network. This switch also features fullduplex capability on all ports, which effectively doubles the bandwidth of each connection.
The RMON/SNMP/Web management agent provides a broad range of management options. It includes a standards-compliant Simple Network
Management Protocol (SNMP) agent. The SNMP agent allows network management station applications to collect and present status and performance information about the switch, as well as providing the ability to configure and control functions in the switch. The SNMP agent also supports Remote Monitoring (RMON) for Statistics, History, Alarm and
Event groups (Groups 1-3, 9).
Network management can be performed in-band using TCP/IP or Telnet connection to the serial console port on the switch’s rear panel. The switch also includes a built-in Web agent that provides management access via common http browsers such as Netscape Navigator and
Microsoft’s Internet Explorer. In addition, the console port allows out-ofband management using a PC or terminal.
This switch also provides support for a Redundant Power Unit to ensure continuous operation in the event of a power failure.
The VH-8G switch is desktop or rack-mountable. LEDs on the front panel provide information about the operating status of the switch. The rear panel contains the power connector, redundant power connector, and the serial console port. The side panel includes two fans that maintain ventilation and cooling for internal switch components.
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Features
• Ports:
- 8 1000Base-SX ports using SC multimode fiber optic connectors
- 1 redundant power unit socket
• Switch Architecture:
- Auto-negotiation of half/full-duplex operation on all ports
- IEEE 802.3x flow control auto-negotiation on all ports
- 1 MB packet buffering per port
- Store-and-forward switching
- 12K address forwarding table
- Forwarding: 1,488,000 packets-per-second (64 byte packets)
@1000 Mbps
- Filtering: 1,488,000 packets-per-second (64 byte packets)
@1000 Mbps
• Network Management:
- SNMP compliant agent: MIB II (RFC 1213); Bridge MIB (RFC
1493); Ethernet-like MIB (RFC1643); RMON - Statistics,
History, Alarm and Event groups (RFC 1757); private MIB extensions
- Access via in-band, Internet browser, or Telnet
- Console port (RS-232, male DB-9 connector, null modem) supports access via direct connection
- BootP for IP address configuration
• Reliability:
- Redundant power supply support
• Software:
- Extensive diagnostics for product testing and troubleshooting
- Firmware upgrades using the console port or in-band with
TFTP
• LED Indicators:
- System: Power
- 1000Base-SX ports: link/disable, activity
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Front Panel
Figure 1-1 shows the front panel of the Enterasys VH-8G.
Table 1-1 defines the VH-8G front panel components.
Figure 1-1. VH-8G Front Panel
Name
Power LED
RPU LED
Link LEDs
Activity LEDs
Reset Button
Table 1-1. Front Panel Components
1000Base-SX SC ports
Function
Lights steady green to indicate power is supplied to the switch. Lights steady amber to indicate that the switch’s power-on self-test (POST) is running. Off indicates no power is supplied to the switch.
Lights steady to indicate that a redundant power unit is attached and is in backup or active mode.
Lights steady green to indicate a 1000 Mbps link, off indicates no link; and flashing indicates that the port has been manually disabled.
Flashing green indicates activity on the port segment.
Causes the unit to perform a hardware reset, similar to removing and reconnecting the power.
Fiber ports using SC port connectors.
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Rear Panel
Figure 1-3 shows the VH-8G rear panel and Table 1-3 defines the rear panel components.
Figure 1-2. VH-8G Rear Panel
Name
Power Connector
Redundant Power
Connector
Serial Console Port
Table 1-2. Rear Panel Components
Function
Provides AC power to the switch.
This connector is provided for a redundant power unit
(RPU) which can supply power to the switch if its primary power supply fails. (Refer to the manual provided with the RPU for further details.)
Male DB-9 connector configured as a standard RS-232 connection for serial out-of-band management using the console menus.
Feature Summaries
The following summaries describe VH-8G features in areas such as standards compliance, functionality, performance, and options.
IEEE 802.1D Bridge
The VH-8G switch is fully compliant with IEEE 802.1D transparent bridging specifications. An address table is provided for learning, filtering, and forwarding. The switch can support up to a maximum of 12K addresses. Addresses are automatically learned by the switch, and can be individually assigned specific forwarding treatment by the network administrator if desired. Forwarding table configuration can be made outof-band via the console interface or in-band via SNMP or Telnet. Static and dynamic addresses are both stored in this table. One static address is assigned per port by default. The Static Unicast Address Table
Configuration screen in the console menus allows you to assign additional static addresses if required.
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Spanning Tree Protocol
The VH-8G switch supports the IEEE 802.1D Spanning Tree Protocol.
This protocol allows redundant connections to be created between different LAN segments for purposes of fault tolerance. Two or more physical paths between different segments can be created through the switch, with the Spanning Tree Protocol choosing a single path at any given time and disabling all others. If the chosen path fails for any reason, a disabled alternative is activated, thereby maintaining the connection.
This prevents network traffic from circulating in an endless loop formed by multiple connections to the same LAN segment.
Spanning Tree parameters are configurable using the Spanning Tree
Configuration Menu of the console menus, the on-board Web agent, or via SNMP (see Appendix A, “Spanning Tree Concepts,” in the VH-8G
Management Guide for more information).
Frame Buffering and Frame Latency
The VH-8G switch is a store-and-forward switching device. Each frame is copied into switch memory before being forwarded to another port. This method ensures that all forwarded frames conform to a standard Ethernet frame size and have a correct cyclic redundancy check (CRC) for data integrity. This switching method prevents bad frames from traversing the network and using up valuable network bandwidth, as with cut-through switching technology.
To minimize the possibility of dropping frames on congested ports, the
VH-8G switch provides 1 MB of frame buffering per port. This buffer space is used to queue packets for transmission on congested networks. This is an additional advantage over cut-through switching technology, which drops packets immediately when experiencing collisions.
Software Download
The VH-8G switch supports the industry-standard Trivial File Transfer
Protocol (TFTP) for downloading software to the switch. All switch software is stored in a 2 MB sectored flash ROM. The download feature allows you to easily install software upgrades to the unit. Software can alternatively be downloaded via the serial console port using the
XMODEM protocol.
A TFTP software download is invoked via the Management Setup Menu using the console menus. A TFTP download can also be invoked using the on-board Web agent or via SNMP.
Non-volatile Parameter Storage
Important operating parameters such as IP addresses, Spanning Tree configuration, and management security parameters, are stored in non volatile Flash memory. These values are retained when the switch experiences power interruptions or is powered down for normal maintenance.
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Configuration and Management Interfaces
The VH-8G switch can be managed using any of the following methods:
• Serial console, out-of-band
An RS-232 connection, using a DB-9 connector, is included on the switch’s rear panel for system management. Serial console management can be performed out-of-band by directly connecting a terminal or computer running communications software to the
RS-232 port on the switch. See the Management Guide for information on managing the VH-8G switch via the serial console.
• Telnet, in-band (over Ethernet)
The switch supports management through a Telnet connection using the TCP/IP protocols. Telnet is performed using a terminal or computer running communications software. See the Management
Guide for information on managing the system via Telnet. Global user name and password protection for changing the operating parameters of the switch is provided.
• Web-based network manager, in-band
The system can be managed over HTTP protocol with a Web browser (Internet Explorer 4.0 or above, or Netscape Navigator 4.0 or above). Standard agent MIBs embedded in the switch provide basic SNMP management through an embedded graphic interface.
• SNMP-based network manager, in-band
The system can also be managed using SNMP, the most common protocol used today for network management. Standard agent MIBs embedded in the switch provide basic SNMP management through industry-standard SNMP applications.
Management security protection is provided based on SNMP community names. See Chapter 4, “SNMP Management,” in the
Management Guide for more information.
RMON
RMON (Remote Monitoring) is a facility used to manage networks remotely while providing multi-vendor interoperability between monitoring devices and management stations. RMON is defined by an SNMP MIB.
This MIB is divided into nine different groups, each gathering specific statistical information or performing a specific function. RMON-capable devices gather network traffic data and then store them locally until downloaded to an SNMP management station.
The VH-8G supports four of the nine groups of RMON defined for
Ethernet networks on a per segment basis. Specifically, these are:
• Statistics: a function that maintains counts of network traffic statistics such as number of packets, broadcasts, collisions, errors, and distribution of packet sizes.
• History: a function that collects historical statistics based on userdefined sampling intervals. The statistical information collected is the same as the Statistics group, except on a time stamped basis.
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• Alarm: a function that allows managers to set alarm thresholds based on traffic statistics. Alarms trigger other actions through the Event group.
• Event: a function that operates with the Alarm group to define an action that will be taken when an alarm condition occurs. The event may write a log entry and/or send a trap message.
Note that RMON statistics and other information can only be viewed using a connection to the on-board web agent or via other compatible SNMP management applications.
Port Mirroring
The VH-8G switch includes the ability to mirror the traffic being switched on any port for purposes of network traffic analysis and connection integrity. When this feature is enabled, a protocol analyzer or RMON probe can be connected to the mirror port. You can only mirror one port to another port at one time. Port mirroring is configurable using the console interface menus, the on-board Web agent, or via SNMP.
BootP
The Bootstrap Protocol (BootP) provides for the capability of passing configuration information to hosts on a TCP/IP network. Using this process, network devices do not need to be configured before they can communicate using the TCP/IP protocol suite. The VH-8G switch uses
BootP to automatically configure IP address information without requiring access to the console menus. BootP operation is configurable using the console interface menus, the on-board Web agent, or via SNMP.
LEDs
The switch port LEDs provide a quick and accurate display of the integrity of switch connections. Each SC port has a Link and Act LED. The Link
LED indicates a valid 1000 Mbps connection or if the port has been disabled. The Act LED indicates network activity on the port segment.
Full-Duplex Mode
The full-duplex mode of operation on a port doubles the throughput of the switch connection. Full-duplex mode disables the collision detection portion of the Ethernet Carrier Sense Multiple Access with Collision
Detection (CSMA/CD) protocol, allowing for two-way traffic. Full duplex is configurable using the console interface menus, the on-board Web agent, or via SNMP.
Flow Control
Flow control allows you to manage network traffic during congestion periods and to prevent the loss of packets when port buffer thresholds are exceeded. Flow control also serves to deny access to additional traffic that could add to a congestion condition. The VH-8G switch supports flow
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Appendix B, “Flow Control,” for more information on this feature.
If flow control is desired for one port, it is recommended that it be enabled on all ports.
Virtual LANs (VLANs)
VLANs allow you to connect users to a specific LAN segment regardless of their physical location. The VH-8G switch supports tagged VLANs per the IEEE 802.1Q standard. With frame tagging, a short tag is appended to every frame that crosses the network backbone. The tag identifies which VLAN the frame belongs to. See Appendix B, “Virtual LANs,” in the
VH-8G Management Guide for more information.
Class of Service
Class of Service support allows you to assign a higher priority to selected traffic passing through the switch. The VH-8G switch supports Class of
Service attributes per the IEEE 802.1p standard using a priority queuing mechanism. This feature ensures that traffic during congestion periods will not interfere with traffic assigned a higher priority. Traffic assigned a lower priority is subject to discard when memory is in short supply. See
Appendix C, “Class of Service,” in the VH-8G Management Guide for more information.
Port Trunking
Port trunking allows you to combine ports into an aggregate connection between VH-8G switches. Besides balancing the load across each port in the trunk, the additional ports provide redundancy by taking over the load if a port in the trunk should fail. The VH-8G allows up to four ports to be joined together as a trunk. Up to four port trunks on a single switch can be configured. Each trunk can combine two, three, or four ports, creating an aggregate bandwidth of up to 8Gbps.
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Factory Defaults
Table 1-3 lists the default settings for switch configuration parameters.
Each parameter can be changed via the console menus or Telnet.
Table 1-3. Factory Default Settings
Parameter
Multicast Filtering
GMRP
IGMP Multicast Filtering
Port Configuration
Flow Control
Speed and Duplex
Default Value
Disabled
Disabled
Admin
Broadcast Storm Control
Port Priority
Default Ingress User Priority
Spanning Tree Algorithm
Active Aging Time
Bridge Priority
Forward Delay
Disabled
Auto
Enabled
Enabled - 500 pps
0
300
32768
15
Hello Time
Max Age
Path Cost
Port Priority
2
20
4 - 1000Mbps ports
128
Enabled Spanning Tree Protocol
System Configuration
Management VLAN
BootP Enable
All
Disabled
Password <none>
Screen Timeout 10 min
Send Authentication Fail Traps
SNMP Community Name
Terminal Baud Rate
User Names
Enabled public, private
Auto admin, guest
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Parameter
Virtual LANs
Acceptable VLAN Frame Type
Configurable PVID Tagging
GVRP
Untagged VLAN Group Assignment
VLAN Ingress Filtering
VLAN Learning
Default Value
All
Yes
Disabled
1
False
SVL
Application Examples
The exploding popularity of the Internet and of corporate intranets, as well as new, high-bandwidth desktop applications, are driving the demand for
Gigabit Ethernet. The increase in multimedia traffic and the need to support legacy protocols alongside new, data intensive applications is driving the need for network segmentation and traffic prioritization.
The VH-8G switch is ideal for meeting the needs of today’s high performance networks. The switch is designed to consolidate your network core providing high-bandwidth connections between workgroup switches and server farms. In addition, extensive features, including redundant links, traffic Class of Service and VLAN capability, provide the management needed for the workgroup and local backbone.
The following sections illustrate the VH-8G switch employed in application examples:
• Client/Server Network
• Backbone Consolidation
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Client/Server Network Application
To improve workstation performance in a client/server environment, the
VH-8G switch can be configured to provide 2 Gbps full-duplex Gigabit
Ethernet connections to servers by connecting each to a dedicated switch port (Figure 1-3). Users can be accommodated through connections to other switches with 1000 Mbps uplinks, or through direct connections.
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Figure 1-3. Client/Server Network Application
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Backbone Consolidation Application
The VH-8G switch can be used in a backbone consolidation application, connecting network switches together and providing file-server access
(Figure 1-4). Workgroup switches are provided with a single connection to the VH-8G while servers are put on dedicated ports. The gigabit fiber links allow the switch to connect to a remote location, such as another building floor or a separate building.
Figure 1-4. Consolidated Backbone Application
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2. INSTALLATION
Inspecting Your Shipment
When you receive the shipment of your switch, check the package contents and make sure you have the following items:
• VH-8G switch
• Mounting ears and mounting screws
• Four rubber feet
• ESD wrist strap
• Power cord
• RS-232 null-modem cable
• Product documentation
Site Requirements
Before you install the switch, make sure the site meets the following requirements:
• Mounting
Provide a flat table, shelf surface, or an optional 19 in. (48.3 cm) equipment rack.
Use an EIA standard equipment rack that is grounded and physically secure.
• Power source
Provide a power source within six feet (1.8 m) of the installation location. This source must provide 100 VAC to 240 VAC at 50 Hz to
60 Hz, for 80 VA minimum power. Power specifications for the switch are shown in Appendix A, “Technical Specifications.”
Primary voltage selection within the above ranges is automatic and requires no user action.
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• Environmental
Install the VH-8G switch in a dry area, with adequate air circulation.
Avoid placing the switch in direct sunlight or near other heat sources, such as hot-air vents. For temperature and humidity specifications, see Appendix A, “Technical Specifications.”
• Ventilation
Do not restrict airflow by covering or obstructing air inlets on the side of the switch.
Mounting the Switch on a Table or Shelf
You can mount a standalone switch on a table or shelf. Locate the switch in a position that allows access to the front panel SC ports, visibility of the port LEDs, and access to the rear-panel console port and power cord.
Make sure that the mounting surface can safely support the switch and that there is adequate space around the switch for ventilation and cooling.
1.
The switch ships with four (4) rubber feet. Stick the self-adhesive rubber foot pads on each of the four concave spaces located on the bottom of the switch. The rubber foot pads cushion the switch against shock/vibrations and provide space between each switch for ventilation.
2.
If you want to stack switches, repeat step 1 for each switch to be stacked. Place the first switch on a firm flat surface where you want to install the stack. Stack the other switches on top of this unit.
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Mounting the Switch in a Rack
The switch ships with two (2) multi-position mounting ears and four (4) mounting screws.
The mounting screws are used to attach the mounting ears to the switch. Once the ears are attached to the switch, you will need to provide appropriate screws to mount the switch in a rack.
Figure 2-1 shows the orientation of the mounting ears for attaching the ears to the switch for a rack mount application. Mount the switch with the front panel facing forward. Do the following:
1.
Mount one of the ears to the switch using two (2) of the supplied screws. Repeat this step for the other side of the switch.
2.
Slide the switch into the rack and align the holes in the rack mounting ears with the holes in the rack rails.
3.
Insert and tighten appropriate rack-mounting screws (not provided).
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Figure 2-1. Mounting the Switch in a Rack
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Connecting a Terminal to the Console Port
The console port is a serial RS-232 interface port that enables a connection to a terminal for performing switch monitoring and configuration functions. The terminal may be a PC or workstation running terminal emulation software, or a terminal configured as a Data Terminal
Equipment (DTE) connection.
If you connect a terminal to the console port prior to powering on the switch, you can observe the progress and results of the power-on self test as the switch goes through its initialization process. See “Powering the
Switch” on page 18.
The console port is configured as a standard RS-232 connection using a male DB-9 connector (see Table A-1 for pinouts). A null-modem wired
RS-232 cable is supplied with the switch for connecting to this interface.
This cable is shielded to comply with emissions regulations and requirements.
Console Port (Out-of-Band) Connections
To connect the VH-8G console port to a terminal, do the following:
1.
Connect a VT100 compatible terminal or a PC running a terminal emulation program to the console port (Figure 2-2). Use the nullmodem cable provided with the switch, or use a null-modem connection that is compatible with the console port pin assignments shown in Appendix A.
Figure 2-2. Connecting a Terminal to the Console Port
2.
Connect one end of the interface cable directly to the switch’s console port and tighten the retaining screws.
3.
Connect the other end of the interface cable to a terminal (in some instances, an adapter may be required to make this connection).
4.
From your terminal, start the terminal emulation program.
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5.
Configure the terminal to the following communication settings:
VT100 emulation, 19200 baud, no parity, 8 data bits, 1 stop bit, no flow control, ASCII character set.
In-Band Connections
Prior to accessing the switch via a network connection, you must configure it with a valid IP address, subnet mask, and default gateway using an out-of-band connection or the BootP protocol.
The switch must first be configured to issue BootP requests, since the default is BootP disabled. Refer to the Management Guide for more information.
Telnet Connection - Prior to accessing the switch via an in-band Telnet connection, you must configure it with a valid IP address, subnet mask, and default gateway using an out-of-band connection or the BootP protocol. After configuring the switch’s IP parameters, you can access the on-board configuration program from anywhere within the attached network .
In-Band Network Connection - The on-board configuration program can be accessed using Telnet from any computer attached to the network.
The switch can also be managed by any computer using a web browser
(Internet Explorer 4.0 or above, or Netscape Navigator 4.0 or above), or from a network computer using third-party network management software.
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Powering the Switch
To supply power to the switch, connect the power cord to the switch and to a grounded three-prong wall outlet (Figure 2-3). See Appendix A
“Technical Specifications” on page 21 for more information regarding specific international power cord requirements.
Figure 2-3. Connecting the Power Cord
The Power LED lights green (see Figure 1-1). If it does not, check to make sure that the power cable is plugged in correctly and that the power source is good.
When power is applied, the switch conducts a series of hardware and software tests to verify operation. If a terminal or computer is connected to the console port, the results of the tests are displayed on the screen. If you want to display the results of the tests after the switch has been turned on, turn the power to the switch off then back on.
The switch performs two basic types of tests at power-up. During this time, all the LEDs light in sequence. These tests are:
• Serial port
The serial console port test is the first test. If the switch fails, no further tests are performed and the console displays no information.
• Memory
Memory tests on the CPU RAM are performed after the serial port test.
After these tests are performed, the system initialization screen provides the option of starting the operational software of the switch or performing an XMODEM download to upgrade system firmware. When the operational software is started, the system is functional and the user interface is ready to receive commands at the console.
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Network Cable Requirements
Fiber
Table 2-1 specifies the fiber types, bandwidth requirements, and length constraints for the Gigabit Ethernet fiber interface on the switch’s SC ports.
Table 2-1. 1000Base-SX Fiber Specifications
Modal Bandwidth @ 850 nm Range Fiber Diameter
(microns)
62.5 µm MMF
62.5 µm MMF
50 µm MMF
50 µm MMF
160 MHz/km
200 MHz/km
400 MHz/km
500 MHz/km
2-220 Meters
2-275 Meters
2-500 Meters
2-550 Meters
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1000Base-SX Fiber Ports
The 1000Base-SX fiber ports use SC connectors. Figure 2-4 shows an SC fiber connector being inserted into a fiber port on the VH-8G.
Figure 2-4. Inserting an SC Fiber Connector into a Fiber Port
The 1000Base-SX fiber SC ports support multi-mode 62.5/125µm fiber.
The fiber connectors are configured as a receive (RX) / transmit (TX) pair.
This switch uses lasers to transmit signals over fiber optic cable. The lasers are compliant with the requirements of a
Class 1 Laser Product and are inherently eye safe in normal operation. However, you should never look directly at a transmit port when it is powered on.
Before connecting cables, you may want to first configure the Spanning Tree Protocol and trunk links to avoid network loops. Refer to the Management Guide for more information.
1.
Remove and keep the SC port’s rubber cover. When not connected to a fiber cable, the rubber cover should be replaced to protect the optics.
2.
Check that the fiber terminators are clean. You can clean the cable plugs by wiping them gently with a clean tissue or cotton ball moistened with a little ethanol. Dirty fiber terminators on fiber optic cables will impair the quality of the light transmitted through the cable and lead to degraded performance on the port.
3.
Connect one end of the cable to the SC port on the switch and the other end to the SC port on the other device. Since SC connectors are keyed, the cable can be attached in only one orientation.
4.
As a connection is made, check the green Link LED on the switch corresponding to the port to be sure that the connection is valid.
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APPENDIX A. TECHNICAL SPECIFICATIONS
General
Standards Compliance
IEEE 802.1D Transparent Bridging Specifications (ISO/IEC 10038)
IEEE 802.1p Traffic Class Expediting and Dynamic Multicast Filtering
IEEE 802.1Q Virtual Bridged Local Area Networks
IEEE 802.2 Local Area Networks, Logical Link Control (LLC)
IEEE 802.3 CSMA/CD 9 (ISO/IEC 8802-3)
IEEE 802.3z 1000Base-SX
IEEE 802.3x Flow Control
EIA RS-232C (DTE-to-DCE)
EIA RS-310C (19” rackmount)
Regulatory Compliance
Safety: UL 1950, CSA C22.2 No 950, 73/23/EEC, EN 60950, IEC 950
Electromagnetic Compatibility (EMC): FCC Part 15, CSA C108.8,
89/336/EEC, EN 55022, EN 61000-3-2, EN 61000-3-3, EN 50082-1,
AS/NZS 3548, VCCI V-3
Data Rate
1000 Mbps 8B/10B encoded.
Environmental Specifications
Operating temperature:
Operating humidity:
Storage temperature:
Storage humidity:
32 ° to 122 ° F (0 ° to 50 ° C)
5 to 95% relative, non-condensing
-40 ° to 158 ° F (-40 ° to 70 ° C)
5 to 95% relative, non-condensing
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Electrical Specifications
Input voltage:
Input frequency:
Maximum power consumption:
Physical
Height:
Length:
Width:
Weight:
100-240 VAC
50-60 Hz
80 VA
2.5 in. (6.4 cm)
11.2 in. (28.5 cm)
17.3 in. (44 cm mountable in a standard 19 in. rack)
10.14 lb. (4.6 kg)
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Port Specifications
Console Port
Table A-1 shows the console port pin assignments.
Table A-1. RS-232 Console Port Pin Assignments
6
7
4
5
8
9
2
3
Pin
1
Signal Name
DCD
RXD
TXD
DTR
Ground
DSR
RTS
CTS
RI
Power Cord Set Requirements
The wide-range input feature of the VH-8G Gigabit Ethernet switch permits it to operate from any line voltage between 100 and 240 VAC.
The power cord set (appliance coupler, flexible cord, and wall plug) you received with the switch meets the requirements for use in the country where you purchased the switch.
Power cord sets for use in other countries must meet the requirements of the country where you use the switch. For more information on power cord set requirements, contact your Enterasys Networks Support
Representative.
General Requirements
The requirements listed below are applicable to all countries:
• The length of the power cord set must be at least 5.00 feet (1.5 m) and a maximum of 6.56 feet (2.0 m).
• All power cord sets must be approved by an acceptable accredited agency responsible for evaluation in the country where the power cord set will be used.
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• The power cord set must have a minimum current capacity of 10A and a nominal voltage rating of 125 or 250 VAC, as required by each country’s power system.
• The appliance coupler must meet the mechanical configuration of an
EN 60 320/IEC 320 Standard Sheet C13 connector for mating with appliance inlet on the hub.
Country-Specific Requirements
Table A-2 lists the power cord set requirements by country and identifies the accredited agency within that country.
Table A-2. Power Cord Set Requirements by Country
Country
Australia
Austria
Belgium
Canada
Denmark
Finland
France
Accredited Agency
EANSW
OVE
CEBC
CSA
DEMKO
FIMKO
UTE
1
1
2
1
1
1
See Notes *
1
Germany
Italy
Japan
Netherlands
Norway
Sweden
Switzerland
United Kingdom
VDE
IMQ
JIS
KEMA
NEMKO
SEMKO
SEV
BSI
1
1
3
1
1
1
1
1
United States UL 2
* The note column includes a number. Associate this number with the corresponding notes listed after the table to obtain specific power standards and requirements.
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Note 1
Flexible cord must be <HAR> Type HO5VV-F or HO3VV-F, 3-conductor,
1.0 mm 2 , or 0.75 mm 2 conductor size. Power cord set fittings (appliance coupler and wall plug) must bear the certification mark of the agency responsible for evaluation in the country where it will be used.
Note 2
Flexible cord must be Type SV, SJ, SPT or equivalent, No. 18 AWG,
3-conductor. Wall plug must be a two-pole grounding type with a NEMA
5-15P (15A, 125V) or NEMA 6-15P (15A 250V) configuration.
Note 3
Appliance coupler, flexible cord, and wall plug must bear a “T” mark and registration number in accordance with the Japanese Dentori Law.
Flexible cord must be Type VCT or VCTF, 3-conductor, 0.75mm
2 conductor size. Wall plug must be a two-pole grounding type with a
Japanese Industrial Standard C8303 (15A, 125V) configuration.
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APPENDIX B. FLOW CONTROL
Flow control is a mechanism which allows you to protect the switch from overload conditions and to keep additional traffic off the network when excessive congestion will result. Figure B-1 illustrates flow control for both half- and full-duplex applications.
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Figure B-1. Flow Control for Full- and Half-Duplex Applications
Each port of the switch has a transmit queue which buffers frames to be sent out on that port. In this example, large amounts of data are being sent from Workstation A (connected to port X) and other ports on the switch to Workstation B (connected to port Y).The queue on port Y starts filling up with data until it reaches a determined threshold. The packet which causes the threshold to be exceeded triggers the flow-control function on the port from which the packet entered the switch, in this case port X.
Since port X is configured with flow control set to Enabled, the switch responds by initiating a pause frame (full-duplex applications) or backpressure mechanism (half-duplex applications). The pause frame causes
Workstation A to stop sending packets. After a certain amount of time has elapsed, determined by a value in the pause frame, Workstation A will resume sending data. Similarly, the back-pressure mechanism forces
Workstation A to stop sending packets by inducing collisions on port X.
The pause-frame flow-control mechanism supported by the VH-8G switch conforms with the IEEE 802.3x specification for full-duplex flow control.
For the full-duplex pause-frame mechanism to work, the device connected to the switch port must also support IEEE 802.3x flow control.
Flow control is configurable per port in the Port Configuration Menu of the console menus, using the on-board Web agent, or via SNMP.
Flow Control 27
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28 Flow Control VH-8G
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APPENDIX C. ACRONYMS & ABBREVIATIONS
9033639
ICMP
IEEE
IP
LAN
MAC
MDI
LED
MDI
DCE
DSR
DTE
DTR
ESD
FCS
HTTP
MIB
RFC
RMON
RXD
Term
10Base-T
100Base-TX
100Base-FX
1000Base-SX
1000Base-LX
ANSI
BootP
CAT5
CRC
CSMA/CD
Definition
10 Mbps twisted-pair Ethernet
100 Mbps twisted-pair Fast Ethernet
100 Mbps fiber option Fast Ethernet
1000 Mbps fiber option short-wavelength
Gigabit Ethernet
1000 Mbps fiber option long-wavelength
Gigabit Ethernet
American National Standards Institute
Bootstrap Protocol
Category 5
Cyclic Redundancy Check
Carrier Sense Multiple Access/Collision
Detection
Data Communications Equipment (modem)
Data Send Ready
Data Terminal Equipment
Data Terminal Ready
Electrostatic Discharge
Frame Check Sequence
Hypertext Transfer Protocol
Internet Control Message Protocol
Institute of Electrical and Electronics Engineers
Internet Protocol
Local Area Network
Media Access Control
Media Dependent Interface
Light Emitting Diode
Media Device Interface
Management Information Base
Request for Comment
Remote Monitoring
Receive Data
Acronyms & Abbreviations 29
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Term
SNMP
TCP/IP
TFTP
TXD
UTP
VLAN
Definition
Simple Network Management Protocol
Transmission Control Protocol/Internet
Protocol
Trivial File Transfer Protocol
Transmit Data
Unshielded Twisted Pair
Virtual LAN
30 Acronyms & Abbreviations VH-8G
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INDEX
1000Base-SX fiber ports, 20
802.3x, 8
A architecture, switch, 2
B back-pressure flow control, 27
C cable fiber specifications, 19
RS-232, 16 communication settings, 17 configuration and management, 6 console port connecting to, 16 management interface, 6 pin assignments, 23
D
Data Rate, 21
DB-9 connector, 6 default settings, 9 dimensions of switch, 22 downloading software upgrades, 5
DTE connection, 16
E electrical specifications, 22
EMC compliance, 21 environmental specifications, 21
F fault tolerance port trunking, 8 features of switch, 2 fiber interface, 19 fiber ports, 3, 20 flow control explained, 27 features, 7
9033639 front panel components, 3 front panel LEDs, 3
I
IEEE 802.3x, 8, 27 in-band configuration, 6 connection, 17 indicators, LED, 3 inspecting your shipment, 13
L laser safety, iii
LED indicators, 2, 3 load balancing, 8
M management features, 2 mounting ears, 15 mounting the switch in a rack, 15 on a table or shelf, 14 site requirements, 13
N network cables, 19 network management, 2
O out-of-band configuration, 6
P password protection, 6 pause frames, 27 physical specifications, 22 port LEDs
Activity, 3
Link, 3 port specifications, 23 port trunking, 8 port types, 2 power connector, defined, 4
Index 1
VH-8g.book Page 2 Friday, November 17, 2000 5:29 PM power cord attaching, 18 country-specific requirements, 24 set requirements, 23 power LED, 3 power source, requirements, 13 powering the switch, 18 power-up diagnostics, 16 power-up tests, 18
R rear panel components, 4 redundant power connector, defined, 4 regulatory compliance, 21
Remote Monitoring (RMON), 6
RMON, 6
RS-232 connection, 6
S safety compliance, 21
SC ports, 3 serial port, 6 site requirements, 13
SNMP management, 6 specifications electrical, 22 environmental, 21 fiber cable, 19 physical, 22 port, 23 standards compliance, IEEE, 21 switch features, 2 switch LEDs, 3
T
TCP/IP protocol, 6
Telnet connection, 17 management access, 6 terminal, 6, 16 tests on power-up, 18
TFTP downloads, 5 transmit queues, 27 trunking, 8
V ventilation, 14
VT100, 6
W
Web browser, 6
Web-based network management, 6
X
XMODEM downloads, 5, 18
2 Index VH-8G
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VH-8g.book Page 2 Friday, November 17, 2000 5:29 PM
150183-103 R01
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