Cabletron Systems SmartSTACK ETHERNET ELS10-27 User Manual

SmartSTACK ETHERNET

ELS10-27 USER GUIDE

ETHERNET SWITCH

ELS10-27TX

RESET

COM

PWR

CPU

PORT STATUS MODE

STATUS

TX ACT FDX MON

RX COL 100 USR

LINK

STATUS

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X

LINK

STATUS

LINK

10BASE-T/100BASE-TX

STATUS

LINK

25X 26X 27X

EPIM100

LINK

STATUS

26

STATUS

27

9032800-01

NOTICE

Cabletron Systems 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 Cabletron Systems 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 CABLETRON SYSTEMS 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 CABLETRON SYSTEMS HAS BEEN ADVISED OF, KNOWN, OR SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH DAMAGES.



Order Number: 9032800-01 May 1999

Cabletron Systems, SPECTRUM ELS10-27TX, FEPIM, FEPIM-TX,

All other product names mentioned in this manual may be trademarks or registered trademarks of their respective companies.

, and

and

LANVIEW

FEPIM-FX

are registered trademarks and

are trademarks of Cabletron Systems, Inc.

SmartSTACK,

i

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:

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:

party responsible for compliance could void the user’s authority to operate the equipment.

This equipment has been tested and found to comply with the limits for a Class A digital

Changes or modiﬁcations made to this device which are not expressly approv ed by the

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.

ii

Notice

CABLETRON SYSTEMS, INC.

PROGRAM LICENSE AGREEMENT

IMPORTANT: THIS LICENSE APPLIES FOR USE OF PR ODUCT IN THE FOLLOWING

GEOGRAPHICAL REGIONS:

CANADA MEXICO CENTRAL AMERICA SOUTH AMERICA

BEFORE OPENING OR UTILIZING THE ENCLOSED PRODUCT, CAREFULLY READ THIS LICENSE AGREEMENT.

This document is an agreement (“Agreement”) between You, the end user, and Cabletron Systems, Inc. (“Cabletron”) that sets forth your rights and obligations with respect to the Cabletron 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 CABLETRON OR YOUR DEALER, IF ANY, WITHIN TEN (10) DAYS FOLLO WING THE DATE OF RECEIPT FOR A FULL REFUND.

IF YOU HAVE ANY QUESTIONS ABOUT THIS AGREEMENT, CONTACT CABLETRON SYSTEMS (603) 332-9400. Attn: Legal Department.

1. LICENSE.

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 Cabletron.

2. OTHER RESTRICTIONS.

Program.

3. APPLICABLE LAW.

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.

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.

You have the right to use only the one (1) copy of the Program provided in this

You may not reverse engineer, decompile, or disassemble the

This License Agreement shall be interpreted and governed under the

You understand that Cabletron and its Affiliates are subject to

iii

Notice

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 o r 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.

5. UNITED STATES GOVERNMENT RESTRICTED RIGHTS.

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 Cabletron 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.

writing, Cabletron makes no warranty, expressed or implied, concerning the Program (including its documentation and media).

CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUPPLIED TO

YOU BY CABLETRON 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 A CCOMPANYING HARDWARE.

7. NO LIABILITY FOR CONSEQUENTIAL DAMAGES.

CABLETRON 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 CABLETRON PRODUCT, EVEN IF CABLETRON 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.

Except as may be specifically provided by Cabletron in

IN NO EVENT SHALL

The enclosed Product (i)

iv

Notice

CABLETRON SYSTEMS SALES AND SERVICE, INC.

PROGRAM LICENSE AGREEMENT

IMPORTANT: THIS LICENSE APPLIES FOR USE OF PRODUCT IN THE UNITED

STATES OF AMERICA AND BY UNITED STATES OF AMERICA GOVERNMENT END USERS.

BEFORE OPENING OR UTILIZING THE ENCLOSED PRODUCT, CAREFULLY READ THIS LICENSE AGREEMENT.

This document is an agreement (“Agreement”) between You, the end user, and Cabletron Systems Sales and Service, Inc. (“Cabletron”) that sets forth your rights and obligations with respect to the Cabletron 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 CABLETRON 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 CABLETRON SYSTEMS (603) 332-9400. Attn: Legal Department.

1. LICENSE.

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 Cabletron.

2. OTHER RESTRICTIONS.

Program.

3. APPLICABLE LAW.

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.

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.

You have the right to use only the one (1) copy of the Program provided in this

You may not reverse engineer, decompile, or disassemble the

This License Agreement shall be interpreted and governed under the

You understand that Cabletron and its Affiliates are subject to

v

Notice

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 o r 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.

5. UNITED STATES GOVERNMENT RESTRICTED RIGHTS.

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 Cabletron 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.

writing, Cabletron makes no warranty, expressed or implied, concerning the Program (including its documentation and media).

CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUPPLIED TO

YOU BY CABLETRON 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 A CCOMPANYING HARDWARE.

7. NO LIABILITY FOR CONSEQUENTIAL DAMAGES.

CABLETRON 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 CABLETRON PRODUCT, EVEN IF CABLETRON 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.

Except as may be specifically provided by Cabletron in

IN NO EVENT SHALL

The enclosed Product (i)

vi

Notice

CABLETRON SYSTEMS LIMITED

PROGRAM LICENSE AGREEMENT

IMPORTANT: THIS LICENSE APPLIES FOR THE USE OF THE PRODUCT IN THE

FOLLOWING GEOGRAPHICAL REGIONS:

EUROPE MIDDLE EAST AFRICA ASIA AUSTRALIA PACIFIC RIM

BEFORE OPENING OR UTILIZING THE ENCLOSED PRODUCT, CAREFULLY READ THIS LICENSE AGREEMENT.

This document is an agreement (“Agreement”) between You, the end user, and Cabletron Systems Limited (“Cabletron”) that sets forth your rights and obligations with respect to the Cabletron 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 CABLETRON 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 CABLETRON SYSTEMS (603) 332-9400. Attn: Legal Department.

1. LICENSE.

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 Cabletron.

2. OTHER RESTRICTIONS.

Program.

3. APPLICABLE LAW.

law. The English courts shall have exclusive jurisdiction in the event of any disputes.

4. EXPORT REQUIREMENTS.

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.

You have the right to use only the one (1) copy of the Program provided in this

You may not reverse engineer, decompile, or disassemble the

This License Agreement shall be governed in accordance with English

You understand that Cabletron and its Affiliates are subject to

vii

Notice

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 o r 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.

5. UNITED STATES GOVERNMENT RESTRICTED RIGHTS.

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 Cabletron 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.

writing, Cabletron makes no warranty, expressed or implied, concerning the Program (including its documentation and media).

CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUPPLIED TO

YOU BY CABLETRON 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 A CCOMPANYING HARDWARE.

7.

NO LIABILITY FOR CONSEQUENTIAL DAMAGES. IN NO EVENT SHALL

CABLETRON 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 CABLETRON PRODUCT, EVEN IF CABLETRON 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.

Except as may be specifically provided by Cabletron in

The enclosed Product (i)

viii

DECLARATION OF CONFORMITY

Notice

Application of Council Directive(s):

Manufacturer’s Name:

Manufacturer’ s Address:

European Representative Name:

European Representative Address:

Conformance to Directive(s)/Product Standards:

Equipment Type/Environment:

89/336/EEC 73/23/EEC

Cabletron Systems, Inc. 35 Industrial Way

PO Box 5005 Rochester, NH 03867

Mr. J. Solari Cabletron Systems Limited

Nexus House, Newbury Business Park London Road, Newbury Berkshire RG13 2PZ, England

EC Directive 89/336/EEC EC Directive 73/23/EEC EN 55022 EN 50082-1 EN 60950

Networking Equipment, for use in a Commercial or Light Environment.

Industrial

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 Mr. Ronald Fotino Mr. J. Solari

___________________________________ ___________________________________

Full Name Full Name Compliance Engineering Manager Managing Director - E.M.E.A.

___________________________________ ___________________________________

Title Title Rochester, NH, USA Newbury, Berkshire, England

___________________________________ ___________________________________

Location Location

ix

Notice

x

CONTENTS

CHAPTER 1 INTRODUCTION

1.1 About This Manual..................................................................................1-1

1.2 Getting Help .............................................................................................1-2

1.3 Document Conventions ..........................................................................1-3

1.4 Related Documentation...........................................................................1-4

1.5 Overview...................................................................................................1-4

1.5.1 SmartSTACK Ethernet ELS10-27 Architecture..........................1-5

1.5.2 SmartSTACK Ethernet ELS10-27 Functionality ........................1-5

1.5.3 SmartSTACK Ethernet ELS10-27 Bridge Address Table........1-10

1.5.4 SmartSTACK Ethernet ELS10-27 Port Mirroring....................1-11

1.5.5 SmartSTACK Ethernet ELS10-27 Sample Applications .........1-12

1.5.6 VLANs..........................................................................................1-13

1.5.7 Configuration Commands..........................................................1-15

1.6 Local Console Manager.........................................................................1-16

1.6.1 Command Syntax Conventions.................................................1-17

CHAPTER 2 UNPACKING AND INSTALLING YOUR

SMARTSTACK ETHERNET ELS10-27

2.1 SmartSTACK Ethernet ELS10-27 Front Panel......................................2-2

2.1.1 Indicators ........................................................................................2-4

2.2 Installing an EPIM ...................................................................................2-5

2.3 Installing the SmartSTACK Ethernet ELS10-27...................................2-6

2.4 Checking the Power-up Diagnostics Sequence ...................................2-8

2.5 Connecting the Local Console Manager...............................................2-9

2.6 Connecting To the Network .................................................................2-10

2.6.1 Connecting UTP Cables ..............................................................2-10

2.6.2 Connecting a Multimode Segment to the EPIM100-FX .........2-12

CHAPTER 3 CONFIGURING YOUR

SMARTSTACK ETHERNET ELS10-27

3.1 Assigning IP Addresses ..........................................................................3-2

3.1.1 IP Address Configuration.............................................................3-2

3.1.2 Displaying IP Addresses...............................................................3-4

3.1.3 Deleting an IP Address .................................................................3-5

3.1.4 Changing a Subnet Mask..............................................................3-5

3.1.5 Setting the Default Gateway ........................................................3-5

3.2 Operational Image ...................................................................................3-6

3.3 IGMP..........................................................................................................3-7

3.4 Enabling Bridging ....................................................................................3-9

3.5 Disabling Bridging...................................................................................3-9

xi

Contents

3.6 Displaying Bridging Functions ............................................................3-10

3.7 Enabling Trunking .................................................................................3-10

3.8 Disabling Trunking................................................................................3-12

3.9 Displaying Trunking Status..................................................................3-12

3.10 Port Mirroring.......................................................................................3-14

3.11 Defining and Deleting Workgroups..................................................3-14

3.12 Assigning a ComMunity Name .........................................................3-16

3.13 Configuring Broadcast/Multicast Storm Protection.......................3-17

3.14 Modifying MIB Variables....................................................................3-17

3.15 System Contact .....................................................................................3-18

3.16 System Name ........................................................................................3-18

3.16.1 System Location .........................................................................3-18

3.16.2 Community Names....................................................................3-19

3.16.3 Aging Parameter ........................................................................3-19

CHAPTER 4 MONITORING AND MANAGING YOUR

SMARTSTACK ETHERNET ELS10-27

4.1 SmartSTACK Ethernet ELS10-27 Management Tools ........................4-1

4.2 MIB Support..............................................................................................4-2

4.3 RMON Support ........................................................................................4-2

4.3.1 RMON High Level Description ...................................................4-3

4.3.2 RMON Details ................................................................................4-5

4.4 SmartSTACK Ethernet ELS10-27 Statistics...........................................4-6

4.4.1 Gathering Statistics ........................................................................4-7

4.4.2 System Statistics .............................................................................4-7

4.4.3 Ethernet Port Statistics ..................................................................4-8

4.5 Using LCM to Check SmartSTACK Ethernet ELS10-27 .....................4-8

4.5.1 Displaying Status ...........................................................................4-9

4.5.2 Displaying MAC Addresses.......................................................4-10

4.5.3 Displaying Manufacturing Information ...................................4-12

xii

Contents

CHAPTER 5 SMARTSTACK ETHERNET ELS10-27

DIAGNOSTICS AND TROUBLESHOOTING

5.1 Power-up Diagnostics .............................................................................5-1

5.1.1 Power-up LED Sequence ..............................................................5-1

5.1.2 Specific Power-up Tests ................................................................5-2

5.1.3 Power-up Diagnostics Results .....................................................5-2

5.2 Responses to Failures at Power-up .......................................................5-2

5.3 Status and Activity Indicators................................................................5-3

5.4 Troubleshooting .......................................................................................5-5

5.5 SmartSTACK Ethernet ELS10-27 Does Not Power Up.......................5-5

5.5.1 Connectivity Problems..................................................................5-5

5.5.2 SmartSTACK Ethernet ELS10-27 Has Rebooted .......................5-5

5.5.3 SmartSTACK Ethernet ELS10-27 Does Not Respond

to NMS............................................................................................5-6

APPENDIX A TECHNICAL SPECIFICATIONS

A.1 SmartSTACK Ethernet ELS10-27 Specifications................................A-1

A.2 Serial Cable Pin Assignments ..............................................................A-3

A.3 10BASE-T Pin Assignments..................................................................A-4

A.4 Straight-through Wiring .......................................................................A-5

A.5 Crossover Wiring...................................................................................A-5

A.6 5 - 4 - 3 Rule.............................................................................................A-6

A.7 EPIM-100FX ............................................................................................A-6

xiii

Contents

xiv

CHAPTER 1

INTRODUCTION

1.1 ABOUT THIS MANUAL

This manual is for system administrators responsible for conÞguring, monitoring, and maintaining the SmartSTACK Ethernet ELS10-27TX (also referred to as ELS10-27). You should have a familiarity with networking concepts and principles. In addition, a basic understanding of SNMP is helpful.

Some SmartSTACK Ethernet ELS10-27 conÞgurations can only be done using an SNMP-based Network Management System (NMS). Where applicable, this manual provides instructions for using the Local Console Manager (LCM) to perform basic conÞguration. Where it is not possible to use LCM, general instructions and guidelines applicable to most NMSs are provided.

The contents of each chapter are described below.

¥ Chapter 1,

provides an overview of the SmartSTACK Ethernet ELS10-27Õs switching functions, applications, and the Local Console Manager (LCM).

¥ Chapter 2,

ELS10-27

panels, how to install the SmartSTACK Ethernet ELS10-27, how to connect the Local Console Manager (LCM), and how to connect the ELS10-27 to the network.

¥ Chapter 3,

provides instructions for conÞguring the SmartSTACK Ethernet ELS10-27 using the Local Console Manager (LCM). It also provides some common Management Information Base (MIB) variables you may want to change.

¥ Chapter 4,

ELS10-27

status and statistics. It also describes how to manage the SmartSTACK Ethernet ELS10-27 Ethernet ports using the Local Console Manager (LCM).

Introduction

Unpacking and Installing Your SmartSTACK Ethernet

, describes the SmartSTACK Ethernet ELS10-27 front and rear

Configuring Your SmartSTACK Ethernet ELS10-27

Monitoring and Managing Your SmartSTACK Ethernet

, describes how to monitor SmartSTACK Ethernet ELS10-27

, outlines the contents of this manual and

,

1-1

Introduction

¥ Chapter 5,

Troubleshooting

SmartSTACK Ethernet ELS10-27 Diagnostics and

, describes the SmartSTACK Ethernet ELS10-27 diagnostics and provides information on troubleshooting common problems.

¥ Appendix A,

Technical Specifications

, provides the SmartSTACK

Ethernet ELS10-27 speciÞcations and basic cabling pin assignments.

¥

Index

provides a glossary of terms speciÞc to the SmartSTACK Ethernet ELS10-27 and the page(s) on which they are explained within this manual.

1.2 GETTING HELP

For additional support related to this device or document, contact Cabletron Systems using one of the following methods:

World Wide Web http://www .cabletron.com/ Phone (603) 332-9400 Internet mail support@cabletron.com FTP ftp://ftp.cabletron.com/

Login Password

To send comments or suggestions concerning this document, contact the Cabletron Systems Technical Writing Department via the following email address:

Make sure to include the document Part Number in the email message.

TechWriting@cabletron.com

anonymous your email address

Before calling Cabletron Systems, have the following information ready:

¥ Your Cabletron Systems service contract number

¥ A description of the failure

¥ A description of any action(s) already taken to resolve the problem

(e.g., changing mode switches, rebooting the unit, etc.)

¥ The serial and revision numbers of all involved Cabletron Systems

products in the network

¥ A description of your network environment (layout, cable type, etc.)

1-2

Introduction

¥ Network load and frame size at the time of trouble (if known)

¥ The device history (i.e., have you returned the device before, is this a

recurring problem, etc.)

¥ Any previous Return Material Authorization (RMA) numbers

1.3 DOCUMENT CONVENTIONS

The following conventions are used throughout this document:

LCM commands, prompts, and information displayed by the computer appear in Courier typeface, for example:

Current Number of Learned Addresses: 133

Information that you enter appears in Courier bold typeface, for example:

ELS10-27 >

status

Information that you need to enter with a command is enclosed in angle brackets < >. For example, you must enter an IP address to execute the

ipaddr <IP address>

ELS10-27 >

command:

ipaddr 192.138.217.40

Field value options appear in bold typeface.

The following conventions are also used in this document:

Note:

Calls the readerÕs attention to any item of information that may be of special importance.

Tip:

Caution:

Warning:

Conveys helpful hints concerning procedures or actions.

Contains information essential to avoid damage to the equipment.

Warns against an action that could result in equipment damage, personal injury or death.

1-3

Introduction

1.4 RELATED DOCUMENTATION

The following documentation may assist the user in using this product:

¥

Interconnections, Bridges and Routers,

Radia Perlman, Addison Wesley ©

1992.

¥

Internetworking with TCP/IP: Principles, Protocols, and Architecture

(2nd

¥

The Simple Book, An Introduction to Management of TCP/IP-based internets

, Marshall T. Rose, Prentice Hall © Second Edition, 1994.

1.5 OVERVIEW

The SmartSTACK Ethernet ELS10-27 provides a low cost, high performance solution for 10/100 Mbps switched networks. The SmartSTACK Ethernet ELS10-27TX is conÞgured with twenty-seven RJ45 ports supporting twenty-four autonegotiating 10 Mbps ports and three autonegotiating 10/100 Mbps ports. The device also features two EPIM100 slots that allow the user to install up to two EPIM-100s to provide multimode Þber uplinks (with potential for single mode Þber). It also includes an RS232C port for out-of-band management.

.

ETHERNET SWITCH

ELS10-27TX

RESET

COM

LINK

STATUS

PORT STATUS MODE

STATUS

PWR

TX ACT FDX MON

CPU

RX COL 100 USR

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X

STATUS

LINK

STATUS

10BASE-T/100BASE-TX

LINK

STATUS

LINK

STATUS

25X 26X 27X

EPIM100

26

LINK

STATUS

27

Figure 1-1. SmartSTACK Ethernet ELS10-27 Front Panel

The SmartSTACK Ethernet ELS10-27:

¥ Provides dedicated bandwidth for each network connected to its ports.

¥ Provides full store and forward bridging functionality.

¥ Provides complete error checking functionality.

1-4

Introduction

¥ Provides port trunking to increase bandwidth.

¥ Provides a user selectable monitor port for enhanced troubleshooting.

¥ Supports Auto-negotiation.

¥ Operates in either Half Duplex or Full Duplex modes on all ports.

¥ Implements the Spanning Tree protocol (802.1D).

¥ ConÞgured with factory-set defaults for immediate plug-and-play

capability (IP address is not conÞgured at factory).

In addition, the SmartSTACK Ethernet ELS10-27 offers the following features that can help you manage and maintain your network:

¥ RMON support

¥ ConÞguration and management using the Simple Network

Management Protocol (SNMP) with either an in-band or out-of-band connection.

¥ Protection against broadcast/multicast storms.

¥ Ability to deÞne virtual workgroups for more efÞcient bandwidth

usage. The SmartSTACK Ethernet ELS10-27 ports can be segmented into 8 separate domains.

¥ Compilation of statistics, including Broadcast and Unicast (by port) for

trafÞc generated to a SmartSTACK Ethernet ELS10-27 segment.

1.5.1 SmartSTACK Ethernet ELS10-27 Architecture

The SmartSTACK Ethernet ELS10-27 supports all standard Ethernet-toEthernet bridging functions, has (24) 10 Mbps IEEE 802.3/Ethernet full duplex 10Base-T ports, (3) standard 10/100 Mbps TX full duplex Fast Ethernet ports, and (2) optional 100BaseFX full or half duplex Þber EPIM ports.

1.5.2 SmartSTACK Ethernet ELS10-27 Functionality

¥ Support IEEE 802.1D Spanning Tree Protocol for MAC Bridges.

A 2K entry Filtering Database with learning and aging of entries.

1-5

Introduction

¥ Per Ethernet and Fast Ethernet port packet buffer supporting (1,061)

128-byte packets or (88) 1518-byte packets per port.

¥ Per switch packet buffering is (28,672) 128-byte packets and (2,389)

1518-byte packets.

Two modes of operation are supported, 802.1D and 802.1Q. These are mutually exclusive.

Provide store and forward capability with the ability to switch to fragment free cut-through (starts forwarding after Þrst 128 bytes received) on a per system basis. Autonegotiation on all ports for full or half duplex mode. Autonegotiation of 10/100 Mbps for Fast Ethernet ports.

Two forms of ßow control are supported.

¥ In full duplex mode, 802.3x pause frames are supported.

¥ In half duplex mode, back pressure is supported.

Broadcast storm control on a per port basis will limit transmissions.

Local port mirroring of all ports for valid frames on both Rx and Tx using a user selectable mirror port or MAC address based mirroring.

SmartSTACK Ethernet ELS10-27 offers two basic methods to conÞgure the IP address for the device. These two methods are BOOTP and LCM.

¥ The SmartSTACK Ethernet ELS10-27 utilizes the BOOTP protocol to

obtain an IP Address that may be used by this unit.

¥ ConÞguration via LCM of the device IP address and Default Gateway

The Operational Image is maintained by use of TFTP in conjunction with BOOTP.

The SmartSTACK Ethernet ELS10-27 acts as an IP Multicast Þlter by snooping IGMP messages, IP Multicast UDP messages and other IPM routing messages.

Two forms of VLANs will be supported.

¥ Virtual Workgroup support. Up to 8 workgroups may be conÞgured,

with up to 27 ports in a workgroup. These conÞgurable broadcast/multicast/unicast Þltering parameters for the Virtual Workgroup feature are only supported in 802.1D mode.

1-6

Introduction

¥ IEEE 802.1Q is a standard for virtual bridged local area networks

(VLANs). Thirty-two simultaneous VLANs are supported.

Support RMON Ethernet Statistics, Alarms, Events, and History group.

Network interfaces supported.

¥ All twisted pair copper ports are RJ-45 with internal crossover.

¥ The device has two uplink slots which support a single interface module each. Each interface supports one EPIM-100FX. The interface module is user installable and is hot-swappable. Use of an EPIM in the uplink slot disables one of the Þxed 10/100 Mbps ports.

Several forms of user interface are available for conÞguration and/or statistics monitoring.

¥ Local Console Management (LCM)

¥ Up to 4 simultaneous Telnet sessions are supported.

Telnet, and SNMP can be accessed by either the out-of-band COM port via PPP (Point-to-Point Protocol) or any in-band Ethernet port.

Non-volatile memory is provided to store all user modiÞable conÞguration parameters.

Upload and download of conÞguration parameters:

A system reset button is provided on the front panel. The SmartSTACK Ethernet ELS10-27 will supply port level and system level information via front panel LEDs. Each port has a Link LED and a function LED. The EPIM-100FX has a single green LED which indicates link. When an EPIM is in use the function indicator for one of the Þxed ports is used to indicate the status of the corresponding EPIM.

Serial Number/Revision IdentiÞcation is displayed within the user interfaces.

Watchdog timer feature.

The SmartSTACK Ethernet ELS10-27 enables you to link two or more Local Area Networks (LANs) together. To accomplish this, the SmartSTACK Ethernet ELS10-27 regulates network trafÞc on the basis of the source and destination addresses that are in each data packet it receives.

1-7

Introduction

The SmartSTACK Ethernet ELS10-27 is protocol-transparent, meaning it can handle different types of network trafÞc regardless of the network protocol, such as IP and IPX. As the SmartSTACK Ethernet ELS10-27 reads addresses from the packets it processes, it builds a dynamic database of addresses called the

Bridge Address Table

. In this way, the SmartSTACK Ethernet ELS10-27 continuously learns the addresses of all connected devices. Consequently, you can add new devices to the network, change device addresses, and remove devices from the network without having to reconÞgure the SmartSTACK Ethernet ELS10-27.

The Open System Interconnection (OSI) Reference Model, developed by the International Standards Organization (ISO), identiÞes the levels of functionality inherent in each of its seven layers. The SmartSTACK Ethernet ELS10-27 operates at the Media Access Control (MAC) sub-layer of the Data Link layer.

7

Application Presentation

6 5

Session Transport

4 3

Network

2

1

Data Link

Physical

Figure 1-2. OSI Reference Model

ELS10-27 operates at Layer 2

Because the SmartSTACK Ethernet ELS10-27 does not process any Network Layer information, it provides a high level of performance in terms of packet throughput. In addition, the SmartSTACK Ethernet ELS10-27 does not need to learn network topology, requiring less programming and conÞguration time.

Store and Forward Switching

As an intelligent Ethernet switch, the SmartSTACK Ethernet ELS10-27 uses store and forward switching. Store and forward switching allows the SmartSTACK Ethernet ELS10-27 to temporarily store packets until network resources, typically an unused link, are available for forwarding.

1-8

Introduction

This allows for complete error checking, and limits the amount of time between a device request access to the network, and permission to transmit. In addition, full store and forward switching ensures data integrity; preventing network error conditions from being generated throughout the network.

Discarding Local Trafﬁc

The SmartSTACK Ethernet ELS10-27 checks all incoming packets for the destination address against the Bridge Address Table. If a packetÕs destination address is not on the same network segment as the originating packet, the SmartSTACK Ethernet ELS10-27 forwards the packet to the network segment associated with that destination address, if known. However, if the packetÕs source and destination addresses are on the same network segment, known as local trafÞc, the packet is automatically discarded (i.e., ignored by the SmartSTACK Ethernet ELS10-27).

For example, a Þle transmitted from Workstation A, to Workstation C, in Figure 1-3, does not need to leave LAN 1. The SmartSTACK Ethernet ELS10-27 connected to LANs 1 and 2 sees all trafÞc from LAN 1, including LAN 1 local trafÞc.

ELS10-27

LAN 1

LAN 2

ABC

Figure 1-3. Typical Switching Application

By forwarding only packets addressed to devices on other network segments, the SmartSTACK Ethernet ELS10-27 reduces unnecessary trafÞc and thereby enhances the overall performance of the network.

Note: If the packet address is not found in the Bridge Address Table, it will be

forwarded (flooded) to all network segments.

1-9

Introduction

Spanning T ree Algorithm

The SmartSTACK Ethernet ELS10-27 supports the IEEE 802.1D Spanning Tree algorithm. The Spanning Tree algorithm converts multiple LANs into a Òspanning treeÓ of networks. It is used to prevent bridging loops. This standard deÞnes a logical (not physical) network conÞguration consisting of one extended LAN without active duplicate paths between spanning tree bridges.

The SmartSTACK Ethernet ELS10-27, along with other IEEE 802.1D Spanning Tree compliant bridges in the network, dynamically conÞgure the network topology into a single Spanning Tree by exchanging Bridge Protocol Data Units (BPDUs). Typically, each LAN segment is sent one BPDU every two seconds (this is the default setting).

When there are multiple SmartSTACK Ethernet ELS10-27s connecting LANs in a loop, the Spanning Tree algorithm determines which SmartSTACK Ethernet ELS10-27 should forward packets to the LAN. If there is a cable break or a port failure, the network topology is automatically reconÞgured by the Spanning Tree protocol to create an alternate path to the LAN.

1.5.3 SmartSTACK Ethernet ELS10-27 Bridge Address

Table

In 802.1D mode, the SmartSTACK Ethernet ELS10-27 creates and maintains a dynamic database of addresses called the Bridge Address Table. The SmartSTACK Ethernet ELS10-27 examines every packet to determine its source address and LAN segment origin. It then compares the source address and segment information it Þnds to the entries in the Bridge Address Table.

In 802.1Q mode, if a packetÕs address is not already stored in the Bridge Address Table, the SmartSTACK Ethernet ELS10-27 adds the learned address, associated segment number, and a timer value indicating the age of the observation. Consequently, the SmartSTACK Ethernet ELS10-27 knows the address and associated segment number the next time it sees that address. By using the information stored in the Bridge Address Table, the SmartSTACK Ethernet ELS10-27 is able to quickly forward each packet to the correct LAN segment.

The SmartSTACK Ethernet ELS10-27 learns addresses from all packets, including data transmissions and Òkeep aliveÓ packets (packets sent by

1-10

Introduction

an idle station to let other stations know it is present and functional). When devices are added to the network, removed from it, or relocated, you do not have to reconÞgure the SmartSTACK Ethernet ELS10-27. The unit automatically learns new device addresses, recognizes when a previously used address is missing, or when a device has been moved to a new LAN segment.

An address stored in the Bridge Address Table is discarded if there is no subsequent activity from that address after a conÞgured length of time (Þve minutes by default). This aging process ensures that the Bridge Address Table is continually updated.

Addresses are continually added to and deleted from the Bridge Address Table, reßecting the dynamic nature of internetwork trafÞc.

Each dynamic entry includes:

¥ An Ethernet MAC address

¥ A single port number of the LAN on which the address resides

¥ The age of the entry

The SmartSTACK Ethernet ELS10-27 database allows for 2048 entries. Some

of these entries will be used for permanent entries needed by the switch, and temporary entries dependent on the feature set selected. The remainder will be available for user addresses.

1.5.4 SmartSTACK Ethernet ELS10-27 Port Mirroring

Port Mirroring allows the user to conÞgure a port to be used as an ÒanalyzerÓ or ÒmonitorÓ port. Any port can be selected as the ÒmonitorÓ port. The user can copy data from one user selectable port on the device to the designated ÒmonitorÓ port. Packets copied to the monitor port will not include erred packets.

Mirroring will be supported regardless of the port speed and duplex operation. There, in fact, are two forms of mirroring: port mirroring and MAC address mirroring.

With port mirroring, a port is selected as the source port and a port is selected as the destination port. Any packet received on or sent to the source port will be monitored to the destination port.

1-11

Introduction

With address mirroring, a unicast MAC address and a destination port are speciÞed. Any time a valid packet is received on any port with that destination MAC address within the switch, that packet will be monitored to the destination port. If the address form of the mirror command is issued multiple times, all unicast MAC addresses selected will be mirrored. Up to 4 MAC addresses may be mirrored at any one time.

When mirroring is turned off, the previous parameters are still maintained in non-volatile memory and available if mirroring is re-enabled. The setting of port mirroring clears any address mirroring parameters or vice-versa.

Note: Address entries will be flagged so that they do not get aged out of the

database. We will however allow the port on which they are learned to change.

1.5.5 SmartSTACK Ethernet ELS10-27 Sample

Applications

Just as a six lane highway allows you to travel much faster than a single lane highway, a network backbone creates high-speed connections for your network. In general, a network backbone allows you to distribute access to important network resources such as Þle or print servers. Additional SmartSTACK Ethernet ELS10-27 features, such as trunking, Fast Ethernet, and virtual workgroups allow you to optimize bandwidth and design a more efÞcient ßow for your network trafÞc.

SmartSTACK Ethernet ELS10-27 Trunking

SmartSTACK Ethernet ELS10-27 supports one form of port trunking, StackTRUNK Trunking.

SmartSTACK Ethernet ELS10-27 supports a single trunk group of up to 3 trunked ports. The group can be composed of only the 10/100 Mbps ports. Trunked ports have the following characteristics:

¥ Learned unicast trafÞc destined to one of the trunked ports shall be

distributed evenly between all ports in the trunk group using the same algorithm as the LynxSwitch product.

¥ Unknown addresses and broadcast/multicast trafÞc shall be

forwarded only to a single port within the trunk group according to the trunking algorithm.

1-12

Introduction

¥ TrafÞc received on a trunk port shall not be forwarded to any other

port in the trunk group.

The operator is able to display the trunking state on each port or enable/disable trunking functionality on a port or a range of ports.

10BASE-T Cables

ETHERNET SWITCH

PORT STATUS MODE

STATUS

PWR

ELS10-27TX

RESET

ETHERNET SWITCH

ELS10-27TX

RESET

TX ACT FDX MON

CPU

COM

RX COL 100 USR

PORT STATUS MODE

STATUS

PWR

TX ACT FDX MON

CPU

COM

RX COL 100 USR

10BASE-T Cables

Servers

LINK

STATUS

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X

LINK

STATUS

Trunk Lines

LINK

STATUS

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X

LINK

STATUS

LINK

STATUS

LINK

STATUS

ELS10-27

EPIM100

10BASE-T/100BASE-TX

26

LINK

STATUS

27

25X 26X 27X

ELS10-27

EPIM100

10BASE-T/100BASE-TX

26

LINK

STATUS

27

25X 26X 27X

Network Management Station

Network Switch

WAN Router

Workgroup

Hub

Figure 1-4. SmartSTACK Ethernet ELS10-27 Backbone Conﬁguration

1.5.6 VLANs

There are two types of VLANs that are supported by the SmartSTACK Ethernet ELS10-27 architecture, Virtual Workgroups and 802.1Q VLANs. Virtual Workgroups are only supported in the 802.1D mode.

Virtual Workgr oups

The SmartSTACK Ethernet ELS10-27 allows you to deÞne ports for logical groups of associated devices (virtual workgroups) to provide a more efÞcient ßow of trafÞc across your Ethernet network. You can deÞne a maximum of eight virtual workgroups the number of ports within that

1-13

Introduction

VLAN is not restricted and an individual port can be a member of multiple Virtual Workgroups.

Note: Virtual Workgroups will only operate in 802.1D mode.

Virtual workgroups offer the ability to limit broadcasts to logical domains within the network. Workgroup destinations are recognized by the SmartSTACK Ethernet ELS10-27 and broadcast and unicast packets are routed directly to hosts within the workgroup, eliminating the need to perform a general broadcast across each segment of the network to Þnd speciÞc host addresses.

IEEE 802.1Q VLANs

IEEE 802.1Q is a standard for virtual bridged local area networks (VLANs). It provides an alternate method for forwarding packets through a switch. In an 802.1D (Spanning Tree) bridge, packets are forwarded in accordance with the spanning tree as dynamically created by the 802.1D protocol (Bridge Protocol Data Units (BPDUs), and the spanning tree state of each port. In 802.1Q, in addition to spanning tree, packets are forwarded in accordance with a VLAN tag that is embedded in the packet, and the set of ports registered for that VLAN. A set of rules are used for ingress (receipt), forwarding, and egress (transmit).

The SmartSTACK Ethernet ELS10-27 provides support for port based VLANs.

The ingress rules deal with the reception of tagged and untagged packets and the decision to either drop them, or forward them to the forwarding process.

The forwarding rules deal with forwarding packets utilizing topology restrictions, the Þltering database, queue frames (not supported), map priorities (not supported), and recalculation of the FCS. The forward/Þltering database can contain three types of entries.

¥ Permanent entries

¥ Static entries

¥ Dynamic entries

Dynamic entries are created by the protocols supported by the switch (GVRP). There will be no learning of VLANs outside of this protocol.

The egress rules deal with whether the destination port(s) are members of the VLAN, and whether the VLAN tag is to be stripped. There is also an

1-14

Cabletron Systems SmartSTACK ETHERNET ELS10-27 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual