Cabletron Systems Els10 26Tx Users Manual

ELS10-26TX to the manual cf4e46f0-1c89-49b0-a477-ca07b84907ea

2015-02-05

: Cabletron-Systems Cabletron-Systems-Els10-26Tx-Users-Manual-533111 cabletron-systems-els10-26tx-users-manual-533111 cabletron-systems pdf

Open the PDF directly: View PDF .
Page Count: 116 [warning: Documents this large are best viewed by clicking the View PDF Link!]

Title Page
Notice
Contents
Introduction
Unpacking and Installing Your ELS10-26
Configuring Your ELS10-26
Monitoring and Managing Your ELS10-26
ELS10-26 Diagnostics and Troubleshooting
Technical Specifications
Glossary
Index

SmartSTACK 10

ELS10-26 USER GUIDE

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

9032243-01

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.



Printed in the United States of America

Order Number: 9032243-01 September 1997

Cabletron Systems, SPECTRUM,

and

LANVIEW

are registered trademarks and

SmartSTACK

ELS10-26TX

FEPIM

FEPIM-TX and FEPIM-FX

are trademarks of

Cabletron Systems, Inc.

All other product names mentioned in this manual may be trademarks or registered trademarks of

their respective companies.

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.

Only qualiﬁed personnel should perform installation

procedures.

Printed on Recycled Paper

Notice

DOC 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.

CABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT

IMPORTANT:

Before utilizing this product, carefully read this License Agreement.

This document is an 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 (the

“Program”) contained in this package. The Program may be contained in ﬁrmware, chips or other

media. BY 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, PROMPTLY RETURN THE UNUSED

PRODUCT TO THE PLACE OF PURCHASE FOR A FULL REFUND.

Notice

iii

CABLETRON SOFTWARE PROGRAM LICENSE

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

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.

EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY

1. EXCLUSION OF WARRANTY. Except as may be specifically provided by Cabletron in

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 EXPRESSED 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.

2. 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

ON THE DURATION OR LIMITATION OF IMPLIED WARRANTIES, IN SOME

INSTANCES THE ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO

YOU.

UNITED STATES GOVERNMENT RESTRICTED RIGHTS

The enclosed product (a) was developed solely at private expense; (b) contains “restricted computer

software” submitted with restricted rights in accordance with Section 52227-19 (a) through (d) of the

Commercial Computer Software - Restricted Rights Clause and its successors, and (c) in all respects

is proprietary data belonging to Cabletron and/or its suppliers.

For Department of Defense units, the product is licensed with “Restricted Rights” as deﬁned in the

DoD Supplement to the Federal Acquisition Regulations, Section 52.227-7013 (c) (1) (ii) and its

successors, and use, duplication, disclosure by the Government is subject to restrictions as set forth in

subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at

252.227-7013. Cabletron Systems, Inc., 35 Industrial Way, Rochester, New Hampshire 03867-0505.

Notice

DECLARATION OF CONFORMITY

Application of Council Directive(s):

89/336/EEC

73/23/EEC

Manufacturer’s Name:

Cabletron Systems, Inc.

Manufacturer’s Address:

35 Industrial Way

PO Box 5005

Rochester, NH 03867

European Representative Name:

Mr. J. Solari

European Representative Address:

Cabletron Systems Limited

Nexus House, Newbury Business Park

London Road, Newbury

Berkshire RG13 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

Mr. Ronald Fotino Mr. J. Solari

___________________________________ ___________________________________

Full Name Full Name

Principal Compliance Engineer Managing Director - E.M.E.A.

___________________________________ ___________________________________

Title Title

Rochester, NH, USA Newbury, Berkshire, England

___________________________________ ___________________________________

Location Location

CONTENTS

CHAPTER 1 INTRODUCTION

1.1 ABOUT THIS MANUAL ........................................................................1-1

1.2 GETTING HELP.......................................................................................1-2

1.4 RELATED DOCUMENTATION ...........................................................1-4

1.5 OVERVIEW...............................................................................................1-4

1.5.1 SmartSTACK 10 ELS10-26 Architecture.....................................1-6

1.5.2 SmartSTACK 10 ELS10-26 Bridge Address Table.....................1-9

1.5.3 SmartSTACK 10 ELS10-26 Port Monitoring ............................1-10

1.5.4 SmartSTACK 10 ELS10-26 Sample Applications ....................1-11

1.6 LOCAL CONSOLE MANAGER..........................................................1-18

1.6.1 Command Syntax Conventions.................................................1-18

1.6.2 Basic LCM Commands................................................................1-20

CHAPTER 2 UNPACKING AND INSTALLING

YOUR ELS10-26

2.1 ELS10-26 FRONT PANEL.......................................................................2-1

2.2 INSTALLING AN FEPIM.......................................................................2-4

2.3 INSTALLING THE ELS10-26.................................................................2-5

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...................................................2-9

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

2.6.2 Connecting a UTP Segment to the FE-100TX ..........................2-11

2.6.3 Connecting a Multimode Segment to the FE-100FX...............2-13

CHAPTER 3 CONFIGURING YOUR ELS10-26

3.1 ASSIGNING IP ADDRESSES.................................................................3-2

3.1.1 Displaying IP Addresses...............................................................3-3

3.1.2 Deleting an IP Address .................................................................3-3

3.1.3 Changing a Subnet Mask..............................................................3-4

3.2 ENABLING BRIDGING..........................................................................3-4

3.3 DISABLING BRIDGING.........................................................................3-5

3.4 DISPLAYING BRIDGING FUNCTIONS .............................................3-5

3.5 ENABLING TRUNKING........................................................................3-6

3.6 DISABLING TRUNKING.......................................................................3-9

3.7 DISPLAYING TRUNKING STATUS....................................................3-9

3.8 ENABLING PORT MONITORING.....................................................3-11

3.9 DISABLING MONITORING................................................................3-12

Contents

3.10 DISPLAYING MONITORING STATUS...........................................3-12

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.........................................................3-18

3.15 SYSTEM CONTACT............................................................................3-18

3.16 SYSTEM NAME ...................................................................................3-18

3.16.1 System Location .......................................................................3-19

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

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

CHAPTER 4 MONITORING AND MANAGING

YOUR ELS10-26

4.1 ELS10-26 MANAGEMENT TOOLS ......................................................4-1

4.2 ELS10-26 STATISTICS.............................................................................4-1

4.2.1 Gathering Statistics ........................................................................4-2

4.2.2 System Statistics .............................................................................4-2

4.2.3 Ethernet Port Statistics ..................................................................4-3

4.3 USING LCM TO CHECK ELS10-26 STATUS ......................................4-4

4.3.1 Displaying Status ...........................................................................4-4

4.3.2 Displaying MAC Addresses.........................................................4-6

4.3.3 Displaying Manufacturing Information .....................................4-8

4.4 MANAGING THE ELS10-26..................................................................4-9

4.5 USING LCM TO MANAGE THE ELS10-26.........................................4-9

4.5.1 Disabling a Port..............................................................................4-9

4.5.2 Enabling a Port .............................................................................4-10

4.5.3 Changing a Subnet Mask ............................................................4-11

4.5.4 Changing a Community Name..................................................4-12

4.5.5 Setting the Baud Rate ..................................................................4-13

4.5.6 Setting a Reboot Time..................................................................4-14

Contents

vii

CHAPTER 5 ELS10-26 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 Software Checksum Comparison................................................5-2

5.1.4 Power-up Diagnostics Results .....................................................5-3

5.2 RESPONSES TO FAILURES AT POWER-UP......................................5-3

5.3 STATUS AND ACTIVITY INDICATORS ............................................5-3

5.4 TROUBLESHOOTING............................................................................5-6

5.5 ELS10-26 DOES NOT POWER UP ........................................................5-6

5.5.1 Connectivity Problems..................................................................5-6

5.5.2 ELS10-26 Has Rebooted ................................................................5-6

5.5.3 ELS10-26 Does Not Respond to NMS.........................................5-7

APPENDIX A TECHNICAL SPECIFICATIONS

A.1 ELS10-26 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-6

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

A.7 FEPIM Specifications ............................................................................A-7

APPENDIX B GLOSSARY

viii

Contents

1-1

CHAPTER 1

INTRODUCTION

1.1 ABOUT THIS MANUAL

This manual is for system administrators responsible for

conﬁguring, monitoring, and maintaining the SmartSTACK 10

ELS10-26TX. You should have a familiarity with networking

concepts and principles. In addition, a basic understanding of

SNMP is helpful.

Some SmartSTACK 10 ELS10-26 conﬁgurations 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 conﬁguration.

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,

Introduction

, outlines the contents of this manual

and provides an overview of the SmartSTACK 10 ELS10-26’s

switching functions, applications, and the Local Console

Manager (LCM).

• Chapter 2,

Unpacking and Installing Your ELS10-26

, describes

the SmartSTACK 10 ELS10-26 front and rear panels, how to

install the SmartSTACK 10 ELS10-26, how to connect the Local

Console Manager (LCM), and how to connect the ELS10-26

the network.

• Chapter 3,

Configuring Your ELS10-26

, provides instructions

for conﬁguring the SmartSTACK 10 ELS10-26 using the Local

Console Manager (LCM). It also provides some common

Management Information Base (MIB) variables you may want to

change.

• Chapter 4,

Monitoring and Managing Your ELS10-26

, describes

how to monitor SmartSTACK 10 ELS10-26 status and statistics.

It also describes how to manage the SmartSTACK 10 ELS10-26

Ethernet ports using the Local Console Manager (LCM).

1-2

Introduction

• Chapter 5,

ELS10-26

Diagnostics and Troubleshooting

describes the SmartSTACK 10 ELS10-26 diagnostics and

provides information on troubleshooting common problems.

• Appendix A,

Technical Specifications

, provides the

SmartSTACK 10 ELS10-26 specifications and basic cabling pin

assignments.

• Appendix B,

Glossary

, provides a glossary of terms both speciﬁc

to the SmartSTACK 10 ELS10-26 and common to the networking

ﬁeld.

1.2 GETTING HELP

If you need additional support related to the SmartSTACK 10

ELS10-26, or if you have any questions, comments, or suggestions

concerning this manual, contact Cabletron Systems Global Call

Center:

Phone: (603) 332-9400

Internet mail: support@ctron.com

FTP: ctron.com (134.141.197.25)

Password: your email address

BBS: (603) 335-3358

Modem setting: 8N1: 8 data bits, No parity, 1 stop bit

Introduction

1-3

Before calling Cabletron Systems Global Call Center, have the

following information ready:

• Your Cabletron Systems 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 Cabletron Systems

products in the network

• A description of your network environment (layout, cable type,

etc.)

• 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

For additional information about Cabletron Systems products,

visit our World Wide Web site: http://www.cabletron.com

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:

ELS10-26 >

status

Information that you need to enter with a command is enclosed in

angle brackets < >. For example, you must enter a port number

1-4

Introduction

and an IP address to execute the

ipaddr <port #> <IP address>

command:

ELS10-26 >

ipaddr 6 192.138.217.40

Field value options appear in bold typeface.

The following conventions are also used in this document:

1.4 RELATED DOCUMENTATION

The following documentation may assist the user in using this

product:

•

Getting Started with the SmartSTACK 10 ELS10-26

- contains the

basic information for using the SmartSTACK 10 ELS10-26.

•

SmartSTACK 10 ELS10-26 MIB

Reference Guide

– contains

enterprise MIB information.

•

Interconnections, Bridges and Routers,

Radia Perlman, Addison

•

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

(2nd edition), Volumes I and II, Douglas Comer, Prentice Hall ©

1991.

•

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

internets

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

Note:

Calls the reader’s attention to any item of information that may be

of special importance.

Tip:

Conveys helpful hints concerning procedures or actions.

Caution:

Contains information essential to avoid damage to the

equipment.

Warning:

Warns against an action that could result in equipment

damage, personal injury or death.

Introduction

1-5

1.5 OVERVIEW

The SmartSTACK 10 ELS10-26TX is an intelligent Ethernet-to-

Ethernet switch that is conﬁgured with 25 IEEE 802.3 10BASE-T

Full Duplex Ethernet ports, one ﬁxed 100BASE-TX copper

connection, one port supporting either a copper or ﬁber 100 Mbps

FEPIM (Fast Ethernet Port Interface Module), and one ﬁxed RJ45

for port monitoring of the 10 Mbps ports.

It also includes an RS232C port for out-of-band management.

Figure 1-1 shows the front panel for the SmartSTACK 10

ELS10-26TX.

Figure 1-1. SmartSTACK 10 ELS10-26 Front Panel

The SmartSTACK 10 ELS10-26

• Provides dedicated bandwidth for each network connected to

its ports.

• Provides full store and forward bridging functionality.

• Provides complete error checking functionality.

• Provides port trunking to increase bandwidth.

• Provides a dedicated monitor port for enhanced

troubleshooting.

• Supports Auto-negotiation.

ELS10-26TX Front Panel

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

1-6

Introduction

• Operates in either Half Duplex or Full Duplex modes on all

ports.

• Implements the Spanning Tree protocol (802.1d).

• Conﬁgured with factory-set defaults for immediate plug-and-

play capability (IP address is not conﬁgured at factory).

In addition, the SmartSTACK 10 ELS10-26 offers the following

features that can help you manage and maintain your network:

• RMON support.

• Conﬁguration 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 deﬁne virtual workgroups for more efﬁcient

bandwidth usage. The SmartSTACK 10 ELS10-26 ports can be

segmented into 8 separate broadcast domains.

• Compilation of statistics (by port) for trafﬁc generated by each

user device connected to a SmartSTACK 10 ELS10-26 segment.

1.5.1 SmartSTACK 10 ELS10-26 Architecture

The SmartSTACK 10 ELS10-26 enables you to link two or more

Local Area Networks (LANs) together. To accomplish this, the

SmartSTACK 10 ELS10-26 regulates network trafﬁc on the basis of

the source and destination addresses that are in each data packet it

receives.

The SmartSTACK 10 ELS10-26 is protocol-transparent, meaning it

can handle different types of network trafﬁc regardless of the

network protocol, such as IP and IPX. As the SmartSTACK 10

ELS10-26 reads addresses from the packets it processes, it builds a

dynamic database of addresses called the

Bridge Address Table

. In

this way, the SmartSTACK 10 ELS10-26 continuously learns the

addresses of all connected devices. Consequently, you can add

Introduction

1-7

new devices to the network, change device addresses, and remove

devices from the network without having to reconﬁgure the

SmartSTACK 10 ELS10-26.

The Open System Interconnection (OSI) Reference Model,

developed by the International Standards Organization (ISO),

identiﬁes the levels of functionality inherent in each of its seven

layers. The SmartSTACK 10 ELS10-26 operates at the Media Access

Control (MAC) sub-layer of the Data Link layer. Figure 1-2 shows

the OSI Reference Model.

Figure 1-2. OSI Reference Model

Because the SmartSTACK 10 ELS10-26 does not process any

Network Layer information, it provides a high level of

performance in terms of packet throughput. In addition, the

SmartSTACK 10 ELS10-26 does not need to learn network

topology, requiring less programming and conﬁguration time.

Store and Forward Switching

As an intelligent Ethernet switch, the SmartSTACK 10 ELS10-26

uses store and forward switching. Store and forward switching

allows the SmartSTACK 10 ELS10-26 to temporarily store packets

until network resources, typically an unused link, are available for

forwarding. This allows for complete error checking, and limits the

amount of time between when a device requests access to the

6Presentation

Application

Session

Transport

Network

Data Link

Physical

ELS10-26 operates at Layer 2

1-8

Introduction

network and when it is granted permission to transmit. In

addition, full store and forward switching ensures data integrity,

thus preventing network error conditions from being generated

throughout the network.

Discarding Local Trafﬁc

The SmartSTACK 10 ELS10-26 checks all incoming packets for

their destination address against the Bridge Address Table. If a

packet’s destination address is not on the same network segment

as the originating packet, the SmartSTACK 10 ELS10-26 forwards

the packet to the network segment associated with that destination

address, if known. However, if the packet’s source and destination

address are on the same network segment, known as

local trafﬁc

the packet is automatically discarded (i.e., ignored by the

SmartSTACK 10 ELS10-26).

For example, a ﬁle transmitted from Workstation A to Workstation

C in Figure 1-3 does not need to leave LAN 1. The SmartSTACK 10

ELS10-26 connected to LANs 1 and 2 sees all trafﬁc from LAN 1,

including LAN 1 local trafﬁc.

Figure 1-3. Typical Switching Application

LAN 1 LAN 2

ABC

FastNet 10

ELS10-26

Introduction

1-9

By forwarding only packets addressed to devices on other network

segments, the SmartSTACK 10 ELS10-26 reduces unnecessary

trafﬁc 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.

Spanning Tree Algorithm

The SmartSTACK 10 ELS10-26 supports the IEEE 802.1d Spanning

Tree algorithm. The Spanning Tree algorithm converts multiple

LANs into a “spanning tree” of networks. It is used to prevent

bridging loops. This standard deﬁnes a logical (not physical)

network conﬁguration consisting of one extended LAN without

active duplicate paths between spanning tree bridges.

The SmartSTACK 10 ELS10-26, along with other IEEE 802.1d

Spanning Tree compliant bridges in the network, dynamically

conﬁgure 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 10 ELS10-26s connecting

LANs in a loop, the Spanning Tree algorithm determines which

SmartSTACK 10 ELS10-26 should forward packets to the LAN. If

there is a cable break or a port failure, the network topology is

automatically reconﬁgured by the Spanning Tree protocol to create

an alternate path to the LAN.

1.5.2 SmartSTACK 10 ELS10-26 Bridge Address Table

The SmartSTACK 10 ELS10-26 creates and maintains a dynamic

database of addresses called the Bridge Address Table. The

SmartSTACK 10 ELS10-26 examines every packet to determine its

source address and LAN segment origin. It then compares the

source address and segment information it ﬁnds to the entries in

the Bridge Address Table.

1-10

Introduction

If a packet’s address is not already stored in the Bridge Address

Table, the SmartSTACK 10 ELS10-26 adds the learned address,

associated segment number, and a timer value indicating the age

of the observation. Consequently, the SmartSTACK 10 ELS10-26

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 10 ELS10-26 is able to quickly

forward each packet to the correct LAN segment.

The SmartSTACK 10 ELS10-26 learns addresses from all packets,

including data transmissions and “keep alive” packets (packets

sent by 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 reconﬁgure the

SmartSTACK 10 ELS10-26. 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 conﬁgured

length of time (ﬁve 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, reﬂecting the dynamic nature of internetwork

trafﬁc.

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 10 ELS10-26 stores 979 dynamic (learned) entries

in its Bridge Address Table.

Introduction

1-11

1.5.3 SmartSTACK 10 ELS10-26 Port Monitoring

Port monitoring allows the SmartSTACK 10 ELS10-26 to redirect

network trafﬁc (including MAC layer errors) from one port to the

port monitoring port (MONX port), in effect “mirroring” all

network trafﬁc to this port. This feature allows users who have

existing investments in external analyzers, external RMON probes,

or devices like Network General's Distributed Sniffer System

continue to receive expert analysis and packet decode functions in

a switched environment -- simply use the port mirroring function

to mirror switched trafﬁc to the designated “diagnostic” port to

which the analyzer is attached.

The SmartSTACK 10 ELS10-26 supports local port mirroring.

Local port mirroring is when the diagnostic port is on the same

SmartSTACK 10 ELS10-26 as the mirrored port. The mirrored port

has to be local to the SmartSTACK 10 ELS10-26.

Packet Capturing and Monitoring

Only the 10BASE-T ports on the SmartSTACK 10 ELS10-26 (and

not the 100BASE ports) can be mirrored. The monitoring of

network trafﬁc is performed by the SmartSTACK 10 ELS10-26

hardware.

1.5.4 SmartSTACK 10 ELS10-26 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 ﬁle or print servers. Additional SmartSTACK 10 ELS10-26

features, such as trunking, Fast Ethernet, and virtual workgroups

allow you to optimize bandwidth and design a more efﬁcient ﬂow

for your network trafﬁc.

1-12

Introduction

SmartSTACK 10 ELS10-26 Trunking

The SmartSTACK 10 ELS10-26 allows two trunk groups with up to

eight ports each to be connected between the SmartSTACK 10

ELS10-26 and other devices in the FastNetwork and SmartSTACK

families. This capability provides a scalable dedicated bandwidth

of up to 160 Mbps for 10 Mbps ports and 400 Mbps for 100 Mbps

ports.

For example, local trafﬁc, such as the Manufacturing Department’s

internal trafﬁc, can be easily handled by a single, 10 Mbps

connection. However, when the Manufacturing Department needs

access to the corporate database, the trafﬁc could travel over a

trunk line, thereby increasing the speed of transmission.

Figure 1-4 illustrates the trunking of multiple SmartSTACK 10

ELS10-26 ports to increase the bandwidth.

Figure 1-4. SmartSTACK 10 ELS10-26 Trunking with 10 Mbps Ports

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM ELS10-26

LAN segments

ELS10-26

Up to 80 Mbps

Bandwidth

LAN segments

Trunk Lines

10 Mbps 10 Mbps

Introduction

1-13

Figure 1-5 illustrates how the SmartSTACK 10 ELS10-26 can be

used in a backbone network conﬁguration.

Figure 1-5. SmartSTACK 10 ELS10-26 Backbone Conﬁguration

SmartSTACK 10 ELS10-26 Fast Ethernet

The SmartSTACK 10 ELS10-26 has two additional ports that

provide fast Ethernet connections of 100 Mbps. Applying this

increased bandwidth to the previous example, the Manufacturing

Department’s trafﬁc to the corporate database could be

transmitted to the corporate database at the 100 Mbps rate.

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

Network Switch

Workgroup

Hub

WAN Router

10BASE-T Cables

Servers Network

Management

Station

Trunk Lines ELS10-26

ELS10-26

1-14

Introduction

Figure 1-6 illustrates connecting two SmartSTACK 10 ELS10-26

Fast Ethernet ports to increase the bandwidth to 200 Mbps.

Figure 1-6. SmartSTACK 10 ELS10-26 Trunking with 100 Mbps Ports

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

ELS10-26

LAN segment

ELS10-26

200 Mbps bandwidth

LAN segment

(Fast Ethernet, Full Duplex)

Front Panel

Introduction

1-15

Figure 1-7 illustrates how the SmartSTACK 10 ELS10-26 can be

used in a backbone network conﬁguration using increased

bandwidth of the Fast Ethernet conﬁguration.

Figure 1-7. SmartSTACK 10 ELS10-26 Backbone Conﬁguration

Virtual Workgroups

The SmartSTACK 10 ELS10-26 allows you to deﬁne ports for

logical groups of associated devices (virtual workgroups) to

provide a more efﬁcient ﬂow of trafﬁc across your Ethernet

network. You can deﬁne a maximum of eight virtual workgroups.

Virtual workgroups offer you the ability to limit broadcasts to

logical domains within the network. Workgroup destinations are

recognized by the SmartSTACK 10 ELS10-26 and broadcast packets

are routed directly to hosts within the workgroup, eliminating the

need to perform a general broadcast across each segment of the

network to ﬁnd speciﬁc host addresses.

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

10BASE-T Cables

Servers

ELS10-26

Network Switch

WAN Router

Network

Management

Station

Workgroup

Hub

100 Mbps (Fast Ethernet)

1-16

Introduction

Figure 1-8 shows two Ethernet segments, A and B, that do not

include a SmartSTACK 10 ELS10-26.

Figure 1-8. Multiple Ethernet Segments Sharing 10 Mbps Bandwidth

Each host on segments A and B is limited to sharing a network

bandwidth of 10 Mbps.

Repeater

Trafﬁc Trafﬁc

Introduction

1-17

Figure 1-9 shows two Ethernet segments that take advantage of the

virtual workgroup feature of the SmartSTACK 10 ELS10-26 and the

increased bandwidth applied to each A and B host.

Figure 1-9. Using the SmartSTACK 10 ELS10-26 to Create Virtual

Workgroups

to Help Optimize Bandwidth

A host from workgroup A can limit a broadcast to all hosts within

workgroup A and prevent the broadcast from going across the

network and adding to the amount of contention for the limited

10 Mbps bandwidth.

Ports that are not part of a workgroup will receive and transmit

packets from any ports. However, if you conﬁgure the

SmartSTACK 10 ELS10-26 with workgroup A and B, as shown in

Figure 1-9, broadcast trafﬁc from workgroup A ports will not be

seen on workgroup B ports, and vice versa.

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

ELS10-26

Router

AAABB

Workgroup A Workgroup B

1-18

Introduction

As illustrated in the previous diagram, virtual workgroups allow

you to associate multiple ports and deﬁne a workgroup. In reality,

you are assigning workgroup IDs to SmartSTACK 10 ELS10-26

ports.

1.6 LOCAL CONSOLE MANAGER

The Local Console Manager (LCM) is a command-line interface

built into the SmartSTACK 10 ELS10-26. The LCM t enables you to

monitor, manage, and conﬁgure the SmartSTACK 10 ELS10-26

through the out-of-band RS232C connection attached to any non-

intelligent terminal or workstation running terminal emulation.

You can also use a Cabletron Systems Network Management

System, or a standard SNMP-based Network Management System,

to manage the SmartSTACK 10 ELS10-26. For a list of available

SmartSTACK 10 ELS10-26 network management tools, see Section

4.1, SmartSTACK 10 ELS10-26 Management Tools.

The following sections describe LCM command syntax and the

basic LCM commands for logging in, logging out, and getting

help.

• LCM commands used for conﬁguring the SmartSTACK 10

ELS10-26 are described in Chapter 3, Configuring Your

SmartSTACK 10 ELS10-26.

• LCM commands used for monitoring and managing the

SmartSTACK 10 ELS10-26 are described in Chapter 4,

Monitoring and Managing Your SmartSTACK 10 ELS10-26.

Note: The Getting Started with the SmartSTACK 10 ELS10-26 guide

lists the available LCM commands, including each command’s

options.

Introduction

1-19

1.6.1 Command Syntax Conventions

The following conventions apply as you use LCM commands:

• Press the Enter key to execute a command after you type it in.

•A port range is either a single port number, or a list of port

numbers separated by commas or hyphens. For example, 3 is

port 3; 3,7 are ports 3 and 7; 3-5 are ports 3,4, and 5; and 3-5,7

are ports 3,4,5, and 7.

• To quit any command, press the Control-C keys (^C or Ctrl-C).

• You can abbreviate any command where there is no ambiguity;

if there is ambiguity, LCM responds with an error message.

• Commands are not case sensitive.

• Any invalid commands or misspellings will receive an error

message.

• A previous command can be repeated by typing !!

• MAC addresses are displayed in little-endian Ethernet (least

signiﬁcant bit) bit order, with each octet separated by a colon.

For example:

ELS10-26 >address 00:40:27:04:1a:0f

• Information that you need to enter with an LCM command is

enclosed in square brackets [ ]. For example, you must enter a

port number and an IP address to execute the ipaddr [PORT-

NUMBER] [IP ADDRESS] command:

ELS10-26 >ipaddr 6 192.138.217.40

• Parameters that appear in all capital letters, for example bridge

[PORT-RANGE], indicate that you must enter a value for that

parameter. If a string of parameters is displayed between braces,

for example [{off|on|noBPDU}], you must select one of the

displayed options. For example, if you wanted to enable

bridging on a port, or a range of ports, you would enter:

ELS10-26 >bridge 2-4 on

1-20

Introduction

1.6.2 Basic LCM Commands

If you are going to manage the SmartSTACK 10 ELS10-26 using

LCM, you ﬁrst must connect the SmartSTACK 10 ELS10-26 to an

ASCII terminal or terminal emulator. See Section 2.5, Connecting

the Local Console Manager, for instructions.

When you want to use LCM, begin by pressing the Enter key

several times to get the LCM prompt (ELS10-26 >).

Help

Displays the menu of available commands. Help can also be

displayed by typing a question mark (?). The output from the help

command is displayed below.

Introduction

1-21

ELS10-26 > help

ELS10-26 Local Console Manager

help or ? this menu

status [PORT-RANGE] to display unit or port status

baud [BAUD-RATE] to change the console baud rate

exit or logout to logout

erase to erase configuration information

indent to display unit identification

ipaddr [PORT# IPADDR [MASK]] to set or display IP addresses

addresses display [any] [ADDR [MASK]] to display learned addresses

bridge [PORT-RANGE [OPTIONS]] to set bridging methods

clearstats to clear all port statistics

trunk [PORT-RANGE [{on|off}]] to set or display trunking status

enable [PORT-RANGE [noRIP][TransmitPacing]] to enable a set of ports

disable [PORT-RANGE] to disable a set of ports

community to change the password/community name

sttimer [TIME-VALUE] to set or display st age timer

workgroup [NAME [delete|PORT-RANGE [INFO]]] to set or display workgroups

speed [PORT-RANGE [{auto|10|100}]] to set or display speed

duplex [PORT-RANGE [{auto|half|full}]] to set or display duplex mode

mirror [PORT# [{Rx|Tx|both|off}]] to set or display port mirroring

time [SystemTime (HHMMSS)] to set or display the system time

date [SystemDate (MMDDYY)] to set or display the system date

reboot (SECONDS|off) to reboot the unit after seconds

arp display to display arp table information

route display to display routing table information

ping [-rvsx] HOST [DATASIZE [count]] to send ICMP ECHO_REQUEST pkts

traceroute [-m MAX_TTL] [-q NQUERIES][-w WAIT] HOST_IP [DATA_SIZE] to print the route

pkts take to host

traplog to display the most recent SNMP traps

1-22

Introduction

Erase

Entering erase to erase the current SmartSTACK 10 ELS10-26

conﬁguration returns all parameters to the default values.

Exit or Logout

Logs you out of LCM. (The exit command is functionally

equivalent to the logout command.)

Traplog

Displays the traps messages captured by the SmartSTACK 10

ELS10-26. The following is an example of a traplog display:

ELS10-26TX> traplog

Trap 16 0:00:00

The unit has booted.

Trap 25 0:00:00

The unit’s spanning tree maximum age has changed.

Trap 26 0:00:00

The unit’s spanning tree hello time has changed.

Trap 27 0:00:00

The unit’s spanning tree forward delay times has changed.

Trap 3 0:00:02 port 1

The current functional state of the port has changed.

...

ELS10-26TX>

2-1

CHAPTER 2

UNPACKING AND INSTALLING

YOUR ELS10-26

Carefully unpack the ELS10-26 from the shipping carton and

inspect it for possible damage. If any damage is evident, contact

your supplier. The shipping carton contains the following:

• The ELS10-26 unit

• One AC power cord

• Console Cable kit

• Two rack-mounting brackets with fasteners (for rack-mount

installation)

• Documentation – In addition to this manual, the Getting Started

with the SmartSTACK 10 ELS10-26 guide, the ELS10-26 MIB

Reference Guide, and Release Notes are also included.

2.1 ELS10-26 FRONT PANEL

The ELS10-26 provides 25 10BASE-T Ethernet ports, and one

100BASE-T Fast Ethernet connection. An additional 100 Mbps port

can be added by using an FEPIM (either copper or ﬁber). Each

ELS10-26 also includes one fixed port used for port mirroring of

the 10BASE-T ports, and an RS232C port for out-of-band

management. Figure 2-1 shows the ELS10-26’s front panel. The

LEDs and buttons are described in Tables 2-1 and 2-2.

2-2

Unpacking and Installing Your ELS10-26

Figure 2-1. ELS10-26 Front Panel

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

RJ45 Ethernet 10BASE-T Ports

Status LEDs

Monitor Port

Reset Switch

Com Port

100BASE Ethernet Port

100BASE Ethernet FEPIM Port

Status Button

Unpacking and Installing Your ELS10-26

2-3

Table 2-1. Meaning of ELS10-26 LEDs

LED Meaning

Port Status Mode

ACT

COL

FDX

100

MON

USR

On – Indicates port is transmitting a packet.

On – Indicates port is receiving a packet.

On – Indicates port is transmitting or receiving.

On – Indicates a collision on a port.

On - Port is operating in Full Duplex.

Off - Port is operating in Half Duplex.

On - Port operating at 100 Mbps.

Off - Port operating at 10 Mbps.

On - Indicates the port is copying to the monitor

port.

On - Indicates that errored packets were received.

Link (Individual

Ports)

On – Indicates the link is good.

Off – Indicates there is no link.

Status

(Individual Ports)

On/Blinking – Indicates you are monitoring the

port for a selected segment status condition. This

LED always indicates the selected status mode.

CPU On – Indicates the ELS10-26 is operational.

Blinking – Indicates the ELS10-26 is running

power-up diagnostics.

Off – Indicates the ELS10-26 is non-operational.

Pwr On – Indicates the ELS10-26 is receiving power

and the voltage is within the acceptable range.

Off – Indicates the ELS10-26 is not receiving

power.

2-4

Unpacking and Installing Your ELS10-26

Table 2-2 describes the ELS10-26 buttons.

2.2 INSTALLING AN FEPIM

The ELS10-26 provides a slot for a Cabletron FEPIM (Fast Ethernet

Port Interface Module). The ELS10-26 is shipped without an

FEPIM. To install an FEPIM, follow the procedure below:

1. Remove the power cord.

2. Remove the cover of the ELS10-26.

3. Remove the two screws securing the plate on the side of the

FEPIM slot.

4. Install the FEPIM as shown in Figure 2-2. Ensure that the rear

connector is seated ﬁrmly before tightening the three

mounting screws.

5. Replace the plate and two screws on the side of the FEPIM

slot.

6. Replace the cover of the ELS10-26.

Table 2-2. Description of ELS10-26 Buttons

Button Function

Status Cycles through the Segment Status options (TX, RX,

Act, Col, FDX, 100, MON, and Usr) for all ports. The

right-hand port status LEDs of the ports you are

monitoring are activated based on what function you

chose with the Select button.

Reset Restarts the ELS10-26.

Only qualiﬁed personnel should perform installation

procedures.

Unpacking and Installing Your ELS10-26

2-5

Figure 2-2. Installing an FEPIM

1742-39

FE-100TX

100

Standoff

Standoffs

Module

Motherboard

Connector

Module

Connector

Faceplate

2-6

Unpacking and Installing Your ELS10-26

2.3 INSTALLING THE ELS10-26

Rack-mounting an ELS10-26

Table 2-3 describes some general considerations you should be

aware of before mounting a ELS10-26 in a rack assembly.

Table 2-3. General Considerations for Mounting an ELS10-26

Consideration Discussion

Temperature Since the temperature within a rack assembly

may be higher than the ambient room

temperature, make sure the rack environment

temperature is within the Operating

Temperature range speciﬁed in Appendix A.

Air Flow Make sure there is at least 2 inches (or more)

on both sides of the ELS10-26 to allow for

adequate air ﬂow.

Mechanical Loading Do not place equipment on top of a rack-

mounted ELS10-26.

Circuit Overloading Make sure the power supply circuit to the

rack assembly is not overloaded.

Grounding

(Earthing)

Rack-mounted equipment should be

grounded. In addition to the direct

connections to the main power supplies, make

sure all the other supply connections are also

grounded.

Unpacking and Installing Your ELS10-26

2-7

The ELS10-26 can be rack-mounted in a standard 19-inch

equipment cabinet. To mount the ELS10-26 in a rack assembly,

apply the following steps:

1. Attach the rackmount brackets to either side of the ELS10-26

chassis, as shown in Figure 2-3.

Figure 2-3. Attaching Rackmount Brackets

2. Place the ELS10-26 chassis in the cabinet.

3. Secure the ELS10-26 with the rackmount fasteners by inserting

and securing a fastener through each of the four slots in the

rack-mount brackets, as shown in Figure 2-4.

Figure 2-4. Rack-mounting the ELS10-26

Screws (4)

Rackmount

Brackets (2)

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

Screws (4)

19-Inch Rack

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

2-8

Unpacking and Installing Your ELS10-26

4. Once the ELS10-26 is installed, plug the AC power cord into

the AC power connector on the rear of the ELS10-26 chassis.

Plug the other end of the power cord into a three-prong

grounded outlet.

2.4 CHECKING THE POWER-UP DIAGNOSTICS

SEQUENCE

Before connecting any devices to the ELS10-26, power on the unit

and observe the power-up diagnostics sequence to check for

proper operation.

To observe the power-up diagnostics sequence completely, you

may want to repeat it. To restart the power-up sequence, press the

reset button on the front panel.

When you power up the ELS10-26, the following occurs:

1. All LEDs, except the Port Link LEDs, turn on for one second.

2. The Power (Pwr) LED remains on.

3. The CPU LED starts ﬂashing.

4. After several seconds, the Port Link LEDs turn on,

individually, in sequence, from left to right until all are lit,

then go off.

5. After several more seconds, the Ready LED will stay on,

indicating that the power-up diagnostics sequence is

complete.

6. In addition, the Port Link LEDs will turn on for those ports

with good links and the Segment Status LEDs will turn on (or

ﬂash) when the selected status condition is present.

Note: If a critical component fails diagnostics, the CPU LED will turn off

and the ELS10-26 will attempt to reboot. If the CPU LED does not

stay on, contact Cabletron Systems Global Call Center. Refer to

Section 1.2.

Unpacking and Installing Your ELS10-26

2-9

2.5 CONNECTING THE LOCAL CONSOLE MANAGER

The Local Console Manager (LCM) is a command-line interface for

conﬁguring, monitoring, and managing the ELS10-26 through the

out-of-band RS232C connection on the front panel.

To connect the LCM:

1. Connect your ASCII terminal or terminal emulator to the out-

of-band management RS232C port on the front panel of the

ELS10-26 using the standard RJ-45 twisted pair cable shipped

with the unit. (Only three wires are necessary: Receive Data,

Transmit Data and Ground.)

2. Set the terminal to 9600 baud, 8N1: 8 data bits, 1 stop bit, and

no parity, XON/XOFF ﬂow control.

3. Press the Enter key several times. If the ELS10-26 and terminal

are operational, LCM responds with the ELS10-26 > prompt.

4. LCM is now ready to use.

Refer to Section 1.6, Local Console Manager for a general

overview of LCM and the command syntax. LCM commands for

conﬁguring, monitoring, and managing the ELS10-26 are provided

in the chapters dealing with those topics.

2.6 CONNECTING TO THE NETWORK

This section provides the procedures for connecting UTP and

multimode ﬁber optic segments from the network or other devices

to the ELS10-26.

Ports 1 through 26 have RJ45 connectors for UTP connections. Port

27 supports FE-100TX or FE-100FX Fast Ethernet Interface

Modules. The FE-100TX has an RJ45 connector for a UTP cable

connection. The FE-100FX has an SC style MMF connector.

Refer to Section 2.6.1to make UTP connections.

Refer to Section 2.6.2 to make a UTP connection to an FE-100TX.

2-10

Unpacking and Installing Your ELS10-26

Refer to Section 2.6.3 to make a ﬁber optic connection to an

FE-100FX.

2.6.1 Connecting UTP Cables

Before connecting a segment to the ELS10-26, check each end of the

segment to verify wire crossover.

Connect a twisted pair segment to the ELS10-26 as follows:

1. Ensure that the device at the other end of the segment is

connected to the segment and is powered ON.

2. Refer to Figure 2-5. Connect the twisted pair segment to the

ELS10-26 by inserting the RJ45 connector on the twisted pair

segment into the desired RJ45 port.

Figure 2-5. ELS10-26 Twisted Pair Connection

3. Verify that a Link exists by checking that the port LINK LED is

on (solid green). If the LINK LED is off, perform the following

steps until it is on:

Caution: To establish a link, you must have an odd number of crossovers

(preferably one) between 10BASE-T devices of the same type

(i.e., from repeater to repeater or transceiver to transceiver).

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

Unpacking and Installing Your ELS10-26

2-11

a. Check that the 10BASE-T device at the other end of the

twisted pair segment is ON and connected to the segment.

b. Verify that the RJ45 connectors on the twisted pair segment

have the proper pinouts (Figure 2-7) and check the cable

for continuity.

Figure 2-6. Cable Pinouts - (RJ45) Crossover Cable

c. Check that the twisted pair connection meets the dB loss

and cable specifications.

If a link is not established, contact Cabletron Systems Global

Call Center. Refer to Section 1.2, Getting Help, for details.

4. Repeat step 2, above, until all connections have been made.

2.6.2 Connecting a UTP Segment to the FE-100TX

An FE-100-TX installed in port slot 27 is often used to provide a

connection between the ELS10-26 and a bridge, router, or switch.

Usually, in this conﬁguration, a “straight-through” cable is used

and the Fast Ethernet Interface Module crossover switch shown in

Figure 2-7 is set to “not crossed over.”

Normally, when connecting devices to like devices, crossing over

of the transmit and receive pairs must occur. Before connecting a

segment to the FE-100TX, check each end of the segment to

TX+

TX-

RX+

RX-

TX+

TX-

RX+

RX-

ELS10-26 RJ-45 Port TO

10Base-T Device Port

Note: RX+/RX- and

TX+/TX- must share a

common color pair.

2-12

Unpacking and Installing Your ELS10-26

determine if the wires have been crossed over for the proper

connection.

A schematic of a crossover cable is shown in Figure 2-6. If the wires

do not cross over, use the switch on the FE-100TX to internally

cross over the RJ45 port. Figure 2-7 shows how to properly set the

FE-100TX crossover switch.

Figure 2-7. FE-100TX Crossover Switch

Connect an FE-100TX to a twisted pair segment as follows:

1. Ensure that the device at the other end of the segment is

connected to the segment and is powered ON.

2. Connect the twisted pair segment to the module by inserting

the RJ45 connector on the twisted pair segment into the RJ45

port on the module. See Figure 2-7.

3. Verify that a Link exists by checking that the port LINK LED is

on (solid green). If the LINK LED is off, perform the following

steps until it is on:

a. Check that the 100BASE-TX device at the other end of the

twisted pair segment is powered up.

b. Verify that the RJ45 connector on the twisted pair segment

has the proper pinouts.

c. Check the cable for continuity.

Position X

(crossed over)

1. RX+

2. RX-

3. TX+

4. NC

5. NC

6. TX-

7. NC

8. NC

FE-100TX

166505

100

Position =

(not crossed over)

1. TX+

2. TX-

3. RX+

4. NC

5. NC

6. RX-

7. NC

8. NC

Unpacking and Installing Your ELS10-26

2-13

d. Make sure that the twisted pair connection meets dB loss

and cable specifications.

e. Confirm that the crossover switch is in the correct position.

f. Confirm that the devices on each end of the link are using

the correct speed (use the LCM status command to check

actual operating speed and use the speed command to

display the configured speed of the port).

If a Link is not established, contact Cabletron Systems Global Call

Center. Refer to Section 1.2, Getting Help, for details.

2.6.3 Connecting a Multimode Segment to the FE-100FX

The FE-100FX has an SC style network port (see Figure 2-8).

Cabletron Systems supplies ﬁber optic cable that uses SC style

connectors that are keyed to ensure proper crossing over of the

transmit and receive ﬁbers.

Fiber Optic Network Connection

1. Remove the protective plastic covers from the ﬁber optic ports

on the applicable port on the module and from the ends of the

connectors.

Caution: An odd number of crossovers (preferably one) must be

maintained between devices so that the transmit port of one

device is connected to the receive port of the other device and

vice versa.

If the ﬁber optic cable being used has SC style connectors that

do not resemble MIC style connectors, or has SC connectors on

one end and a different type on the other, such as ST

connectors, ensure that the proper crossing over occurs.

2-14

Unpacking and Installing Your ELS10-26

2. Insert one end of the SC connector into the FE-100FX installed

in the ELS10-26. See Figure 2-8.

3. At the other end of the ﬁber optic cable, attach the SC

connector to the other device.

Figure 2-8. FE-100FX Port

4. Verify that a Link exists by checking that the port LINK LED is

solid green. If the LINK LED is off, perform the following

steps until it is on:

a. Check that the power is turned on for the device at the

other end of the Link.

Caution: Do not touch the ends of the fiber optic strands, and do not let

the ends come in contact with dust, dirt, or other contaminants.

Contamination of the ends causes problems in data

transmissions. If the ends become contaminated, clean them

with alcohol using a soft, clean, lint-free cloth.

FE-100FX

RX LED

Unpacking and Installing Your ELS10-26

2-15

b. Verify proper crossing over of fiber strands between the

applicable port on the ELS10-26 and the fiber optic device

at the other end of the fiber optic link segment.

c. Verify that the fiber connection meets the dB loss

specifications.

If a Link has not been established, contact Cabletron Systems

Global Call Center. Refer to Section 1.2, Getting Help, for details.

The ELS10-26 is now ready to be set up through Local

Management. Refer to Chapter 4, Monitoring and Managing Your

ELS10-26, to conﬁgure the ELS10-26.

2-16

Unpacking and Installing Your ELS10-26

3-1

CHAPTER 3

CONFIGURING YOUR ELS10-26

The ELS10-26 does not require any additional conﬁguration to

operate as a standard, transparent switch. However, if you want to

use any of the ELS10-26’s advanced functions, you must ﬁrst

assign an IP (Internet Protocol) address to any of the ports on the

ELS10-26 that you use to communicate with a Simple Network

Management Protocol (SNMP) manager.

To initially assign an IP address, you can use the Local Console

Manager (LCM). LCM is a command-line interface built into the

ELS10-26. It allows you to conﬁgure and manage the ELS10-26

through the out-of-band RS232C connection attached to any non-

intelligent terminal, or a PC emulating a non-intelligent terminal.

(See Section 3.1, Assigning IP Addresses.)

Once you have assigned an IP address, you can use any of the

following network management tools to conﬁgure and manage the

ELS10-26:

• SPECTRUM

• SPEL

• SPMA

• Any SNMP-based NMS

Conﬁguration parameters are stored in an SNMP standard

Management Information Base (MIB). All ELS10-26 MIB variables

are listed and described in the ELS10-26 MIB Reference Guide.

Note: There are some configuration options that cannot be configured

using LCM commands. You may need to modify your configuration

using an NMS. See Section 3.14, Modifying MIB Variables.

3-2

Conﬁguring Your ELS10-26

The following sections describe how to conﬁgure the optional

parameters of the ELS10-26 using LCM commands, including:

• Assigning IP addresses

• Enabling and disabling bridging

• Displaying bridging functions

• Enabling and disabling trunking

• Displaying trunking status

• Deﬁning and deleting virtual workgroups

• Assigning a community name

3.1 ASSIGNING IP ADDRESSES

You can assign an IP to each port, or you can assign one address

that can be used for the the entire device. Addresses for each port

must be unique. IP addresses are divided into classes based on

what portion of the address is network or port information. The

address classes are A, B, and C.

• Class A addresses are used in very large networks that support

many ports. The ﬁrst byte identiﬁes the network and the other

three bytes identify the node. The ﬁrst byte of a class A address

must be in the range 1-126. The address 100.125.110.10 would

identify node 125.110.10 on network 100.

Note: You can use the LCM

erase

command to erase all configuration

information and return the unit to default settings on the next

system reset.

If you are using a network management tool other than LCM, refer

to its accompanying documentation.

Conﬁguring Your ELS10-26

3-3

• Class B addresses are used for medium sized networks. The ﬁrst

two bytes identify the network and the last two identify the

node. The ﬁrst byte of a class B address must be in the range 128-

191. The address 128.150.50.10 identiﬁes node 50.10 on network

128.150.

• Class C addresses are used for small networks. The ﬁrst three

bytes identify the network and the last byte identiﬁes the port.

The ﬁrst byte of a class C address must be in the range 192-223.

The address 192.138.217.10 identiﬁes node 10 on network

192.138.217.

To assign an IP address to a port, at the LCM prompt:

1. Type ipaddr <PORT-NUMBER> <IP ADDRESS>

For example, ipaddr 6 192.138.217.40 would set the IP address of

Port 6 to 192.138.217.40. LCM responds by displaying the IP address

table, as shown under the ipaddr command.

3-4

Conﬁguring Your ELS10-26

3.1.1 Displaying IP Addresses

To display IP addresses, subnet masks, and MAC addresses of all

ports on the ELS10-26 you are conﬁguring, at the LCM prompt:

1. Type ipaddr

LCM displays the current IP address table, for example:

3.1.2 Deleting an IP Address

To delete an IP address, at the LCM prompt:

1. Type ipaddr <PORT-NUMBER> 0.0.0.0

LCM responds by redisplaying the current IP address table.

3.1.3 Changing a Subnet Mask

You can optionally set the subnet mask for a port. A subnet mask is

a 32-bit address mask used in IP to specify a particular subnet. If

the subnet mask is 0.0.0.0, the ELS10-26 will automatically convert

the displayed mask to the standard default, based on the port’s IP

address class. (Class A address masks are 255.0.0.0, Class B address

masks are 255.255.0.0, Class C address masks are 255.255.255.0.)

IP Address Address Mask MAC Address

192.138.217.1

0.0.0.0

192.138.217.10

0.0.0.0

192.138.217.20

192.138.217.50

192.138.217.30

255.255.255.0

255.0.0.0

255.255.255.0

255.0.0.0

255.255.255.0

00:40:27:00:06:1f

00:40:27:00:06:c3

00:40:27:00:06:3e

00:40:27:00:03:7a

00:40:27:00:05:c7

00:40:27:00:04:4a

00:40:27:00:06:9e

00:40:27:00:04:b4

Port

Conﬁguring Your ELS10-26

3-5

To change the subnet mask, at the LCM prompt:

1. Type ipaddr <PORT-NUMBER> <IP ADDRESS> <SUBNET MASK>

For example, ipaddr 6 192.138.217.40 255.255.240.0 would set

the subnet mask for port 6 to 255.255.240.0. LCM responds by

redisplaying the current address table.

3.2 ENABLING BRIDGING

The LCM bridge command allows you to set bridging options for a

single port or a range of ports. The options include:

• off

• on (the default with BPDU enabled)

•noBPDU

BPDU (Bridge Protocol Data Unit) is a data unit transmitted as part

of the IEEE 802.1d Spanning Tree protocol. The exchange of BPDUs

allows bridges within a network to logically conﬁgure the network

as a single spanning tree.

Note: When you change the subnet mask for a port, you must also enter

the IP address for that port. Make sure you enter the IP address for

the port correctly; whatever you enter becomes the IP address for

that port.

Note: Selecting the noBPDU option could make your network inoperable

because the ELS10-26 would be unable to detect loops.

3-6

Conﬁguring Your ELS10-26

Using LCM to enable bridging for a port or port range, at the LCM

prompt:

1. Type bridge [PORT-RANGE [{off|on|noBPDU}]]

For example, bridge 2 on would enable bridging on port 2.

LCM responds:

3.3 DISABLING BRIDGING

To turn off the bridging function for a port or port range, at the

LCM prompt:

1. Type bridge [PORT-RANGE] off

For example, bridge 2 off would disable bridging on port 2.

LCM responds:

3.4 DISPLAYING BRIDGING FUNCTIONS

To display the bridging functions that are enabled for all ports, at

the LCM prompt:

1. Type bridge

LCM responds with a list of all ports and the bridging function

that is enabled. For example, typing bridge would display the

bridging status for all ports.

Port 2 bridging: Transparent Bridging

Port 2 bridging: off

Conﬁguring Your ELS10-26

3-7

You could also type bridge [PORT-RANGE] to look at a speciﬁc

range of ports. For example bridge 2-4 would display bridging

functions for ports 2, 3, and 4.

3.5 ENABLING TRUNKING

If your network conﬁguration requires you to connect two or more

ELS10-26s (or other devices capable of trunking) together, but the

applications you are running over the network require more than

10 Mbps of bandwidth per connection, you can use the built-in

trunking feature to increase bandwidth up to 160 Mbps, or

400 Mbps using 100Base ports, without installing additional

hardware on your network.

Trunking is a Cabletron Systems proprietary extension to the

802.1D Spanning Tree algorithm. It enables you to use multiple

10BASE-T Ethernet segments to connect ELS10-26s together, while

maintaining ﬁrst-in, ﬁrst-out ordering of Ethernet packets. In

addition, if any of the Ethernet segments conﬁgured for trunking

become inoperable, those Ethernet segments are automatically

bypassed.

Figure 3-1 shows two ELS10-26s connected by four 10BASE-T

crossover cables. You can connect up to eight ports for sharing the

traffic load. Any additional connected ports will become standby

ports. The connections must be point-to-point. That is, there

cannot be any other devices on the Ethernet segments.

Port 1 bridging: Transparent Bridging

Port 2 bridging: Transparent Bridging

Port 3 bridging: Transparent Bridging

Port 27 bridging: off

Usage: bridge [PORT-RANGE [{off|on|noBPDU{]]

Port 4 bridging: Transparent Bridging

3-8

Conﬁguring Your ELS10-26

Figure 3-1. Trunk Connections

Trunk Groups

Each set of connections between two ELS10-26s is called a Trunk

Group. You can create two Trunk Groups, each having up to eight

ports, to interconnect your ELS10-26s.

For example, if you have three ELS10-26s (A, B, and C), as shown

in Figure 3-2, you could connect them using a single Ethernet

segment. However, that would limit the interconnection to

10 Mbps. To solve this problem, you could connect A to B with one

Trunk Group, and connect B to C with a second Trunk Group.

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

10BASE-T Crossover Cables

ELS10-26

(providing 80 Mbps of bandwidth) ELS10-26

Conﬁguring Your ELS10-26

3-9

Figure 3-2. Trunk Groups

To enable trunking for the example shown, perform the following:

1. Connect the desired ports of the ELS10-26s together using

10BASE-T crossover cables.

If ELS10-26 A is handling only a small number of users, the A

to B Trunk Group could have just two ports per ELS10-26. If

ELS10-26 B and C are expected to interconnect many users,

you could use up to eight ports in the B to C Trunk Group.

2. Using LCM or a NMS, turn on trunking for the connected

ports on each ELS10-26.

For ELS10-26 A, at the LCM prompt:

a. Type trunk 2,3 on

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

Trunk Group #1

ELS10-26 A

Trunk Group #2

ELS10-26 C

ELS10-26 B

3-10

Conﬁguring Your ELS10-26

For ELS10-26 B, at the LCM prompt:

b. Type trunk 3-10,14-15 on

For ELS10-26 C, at the LCM prompt:

c. Type trunk 3-10 on

Each ELS10-26 determines which ports are part of which Trunk

Group. After Trunk Group conﬁguration, the ELS10-26s

complete the standard 802.1D Spanning Tree state changes,

treating each Trunk Group as a single 802.1D Spanning Tree

port.

802.1D Spanning Tree takes about thirty seconds to resolve

which ELS10-26 ports are to become forwarding ports. As ports

within a Trunk Group become forwarding ports, trafﬁc within

the Trunk Group is momentarily halted to guarantee the ﬁrst-

in, ﬁrst-out ordering of the Ethernet packets.

3.6 DISABLING TRUNKING

To turn off trunking, at the LCM prompt:

1. Type trunk <PORT-RANGE> off

For example, trunk 2-4 off

Note: The ELS10-26-to-ELS10-26 connections must be point-to-point.

There cannot be any other devices on those Ethernets. The ports

used for trunking can be in any order. However, both ends of the

ELS10-26-to-ELS10-26 connections must have trunking turned on

for the ports that are being used for the connections.

Conﬁguring Your ELS10-26

3-11

3.7 DISPLAYING TRUNKING STATUS

To check the status of your current trunking conﬁguration, at the

LCM prompt:

1. Type trunk <PORT-RANGE>

The display could look like the following:

Note: IP Addresses are not required for trunking to function.

To check the status for ports conﬁgured for trunking, at the LCM

prompt:

1. Type status <PORT-RANGE>

ELS10-26 > trunk 2-4

Port 2 trunking joined to Bridge MAC Addr 00:40:27:00:06:1f IP Addr 192.138.217.1

Port 3 trunking joined to Bridge MAC Addr 00:40:27:00:06:c3 IP Addr 192.138.200.2

Port 4 trunking joined to Bridge MAC Addr 00:50:36:00:07:4a IP Addr 192.140.250.7

3-12

Conﬁguring Your ELS10-26

The display could look like the following:

The following conditions can be displayed:

• Broken — Trunking is enabled, but the port in non-operational.

• Closed (or Oneway) — Trunking is enabled, and the Trunking

Protocol is attempting to establish a trunk connection.

• Heldown — Trunking is enabled, but the trunk connection was

rejected. After a short time-out period, another attempt is

automatically initiated to establish a good trunk connection.

• Joined — Trunking is enabled, and the Trunking Protocol has

established a good trunk connection.

• Off — Trunking is not enabled.

Port 1 Status

ELS10-26 > status 1

Type/Speed: 10B-TPX/10Mbits

Port Mirroring: No

Duplex Mode: Half Duplex

Bridging: Transparent Bridging

Enabled/Disabled: Enabled, Rip listening

Spanning Tree: Forwarding

Trunking State: Off

Pkts Transmitted: 1693

Pkts Received: 0

Carrier Losses: 1693

Total Collisions: 0

Excess Collisions: 0

RX Missed pkts: 0

RX Runt pkts: 0

RX FCS/Align Errs: 0

Internal TX Errs: 0

Type <CR> to display port 2 status...>

Conﬁguring Your ELS10-26

3-13

• Perturbed — Trunking is enabled, and a good trunk connection

has been established. However, the forwarding of data packets

is temporarily suspended to allow for a change in the

membership of the Trunk Group.

3.8 ENABLING PORT MONITORING

The ELS10-26 allows you to monitor the 10BASE-T ports on the

ELS10-26 (you cannot monitor the 100BASE ports ). The

monitoring of network trafﬁc is performed by the ELS10-26

hardware, and the monitor image reﬂects the original packet. The

ELS10-26 monitoring function maintains the original packet

ordering of bridging frames between the inbound and outbound

interfaces.

Using the LCM or a NMS, you can monitor a port, and select to

monitor only packets received, only packets transmitted, or

packets both received and transmitted by a port (if the port is

operating in half duplex). In full duplex you can mirror either

recieved packet or transmitted packet (not both).

To enable port monitoring on the ELS10-26:

1. Connect a network analyzer to the port labeled MONX on the

ELS10-26.

2. Using the LCM or NMS, select the port or range of ports you

want to monitor. Also select to monitor the received packets

(Rx) or transmitted packets (Tx). If you do not select either the

transmit or recieve options, the ELS10-26 will monitor both

types of packets.

For example, mirror 2 Tx

This will turn on monitoring for packets transmitted on port 2.

3-14

Conﬁguring Your ELS10-26

3.9 DISABLING MONITORING

To turn off monitoring, at the LCM prompt:

1. Type Mirror <PORT> off

For example, mirror 2 off

3.10 DISPLAYING MONITORING STATUS

To check the status of your current monitoring conﬁguration, at the

LCM prompt:

1. Type mirror <PORT>

The display could look like the following:

To check the status for ports conﬁgured for monitoring:

1. Type status <PORT>

ELS10-26> mirror 2

Port Mirroring: Port 2 is mirroring Tx traffic

Conﬁguring Your ELS10-26

3-15

The display could look like the following:

The following conditions can be displayed:

• Rx only — Monitoring is enabled, but monitoring only packets

received by the port.

• Tx only — Monitoring is enabled, but monitoring only packets

transmitted by the port.

• Rx and Tx — Monitoring is enabled, monitoring both transmit

and receive packets.

• No — Monitoring is not enabled.

Port 1 Status

ELS10-26 > status 1

Type/Speed: 10B-TPX/10Mbits

Port Mirroring: No

Duplex Mode: Half Duplex

Bridging: Transparent Bridging

Enabled/Disabled: Enabled, Rip listening

Spanning Tree: Forwarding

Trunking State: Off

Pkts Transmitted: 1693

Pkts Received: 0

Carrier Losses: 1693

Total Collisions: 0

Excess Collisions: 0

RX Missed pkts: 0

RX Runt pkts: 0

RX FCS/Align Errs: 0

Internal TX Errs: 0

Type <CR> to display port 2 status...>

3-16

Conﬁguring Your ELS10-26

3.11 DEFINING AND DELETING WORKGROUPS

The ELS10-26 allows you to deﬁne logical groups of associated

ports (virtual workgroups) to provide a more efﬁcient ﬂow of

trafﬁc across your Ethernet network.

Virtual workgroups offer you the ability to limit broadcasts to

logical domains within the network. Workgroup destinations are

recognized by the ELS10-26 and packets are routed directly to

ports within the workgroup, eliminating the need to perform a

general broadcast across each segment of the network to ﬁnd

speciﬁc host addresses.

Figure 3-3 shows an ELS10-26 that has been programmed to

identify workgroups A and B. Workgroup A uses ports 3 through

5,13 and 16 and workgroup B uses ports 7, 11, 16 and 24. Port 16

connects a segment that contains both workgroup A and

workgroup B hosts.

Figure 3-3. Deﬁning Virtual Workgroups

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

ELS10-26

Router

AAABB

Workgroup A Workgroup B

Conﬁguring Your ELS10-26

3-17

The LCM commands used to create the previous conﬁguration are

as follows:

1. To create workgroup A on ports 3, 4, 5, 13, and 16:

ESL10-26 > workgroup A 3-5,13,16

LCM responds with the following display:

Name: a

Ports: 3, 4, 5, 13, 16

Info: all

2. To create workgroup B on ports 7, 11, 16, and 24:

ESL10-26 > workgroup B 7,11,16,24

LCM responds with the following display:

Name: b

Ports: 7, 11, 16, 24

Info: all

Port 16 has been assigned to a segment that includes ports that

belong to workgroup A and workgroup B. Port 13 connects

workgroup A to the router and port 24 connects workgroup B to

the router.

In the above example, both displays show that all broadcasts will

remain with the workgroup.

Use the LCM command, workgroup, to create, modify, and delete

virtual workgroups. The full syntax of the command is as follows:

workgroup [NAME [{delete | PORT-RANGE [INFO]}]]

To display all of the workgroups deﬁned by the ELS10-26, at the

LCM prompt:

1. Type workgroup

3-18

Conﬁguring Your ELS10-26

To display information about a speciﬁc workgroup, at the LCM

prompt:

1. Type workgroup NAME

To create or modify a workgroup, at the LCM prompt:

1. Type workgroup NAME PORT-RANGE INFO

To delete a workgroup, at the LCM prompt:

1. Type workgroup NAME delete

To create or modify the port list for a speciﬁc workgroup, at the

LCM prompt:

1. Type workgroup NAME PORT-RANGE

To display the network classiﬁcation of a speciﬁc workgroup, at

the LCM prompt:

1. Type workgroup NAME INFO

3.12 ASSIGNING A COMMUNITY NAME

A community name is similar to a password. You use the same

steps to assign a new community name or to change an existing

community name. You can then enter a community name to

perform any SNMP sets. The default password is public the ﬁrst time

you access the device.

To assign a community name, at the LCM prompt:

1. Type community

2. Enter the old community name.

3. If one has not been assigned, public is the default name.

4. Enter the new community name.

Conﬁguring Your ELS10-26

3-19

5. LCM prompts you to verify the new community name by

retyping it.

6. Retype the new community name.

3.13 CONFIGURING BROADCAST/MULTICAST STORM

PROTECTION

The ELS10-26 provides automatic protection against

broadcast/multicast storms. Multicast storms are excessive

broadcasts to all ports, typically caused by a malfunctioning

device. They can result in severe network performance problems,

including causing the network to crash.

To protect against broadcast/multicast storms, you must deﬁne an

acceptable rate for multicast trafﬁc across a port. In many ways,

this feature is similar to ﬁltering.

Each ELS10-26 port can be individually conﬁgured for automatic

multicast storm protection. You deﬁne what level of multicasts the

ELS10-26 will recognize as a multicast storm by specifying the

number of multicast packets that can be transmitted within a given

time period.

For example, if you conﬁgure ELS10-26 to transmit onto Port 3 no

more than ﬁve multicasts per 60 seconds, any multicasts destined

for Port 3 are discarded after the ﬁrst ﬁve multicasts. After 60

seconds have elapsed, another ﬁve multicasts to Port 3 will be

allowed. This maintains an effective maximum rate of ﬁve

multicast packets per minute.

The two Management Information Base (MIB) variables for

conﬁguring multicast storm protection are:

Note: LCM does not allow you to configure for multicast storm

protection. You must use an SNMP-based NMS. See the

documentation that came with your NMS for configuration

instructions.

3-20

Conﬁguring Your ELS10-26

• lxifTxStormCnt – specifies the maximum number of multicasts

that can be broadcast within the given time.

• lxiTxStormTime – specifies the period of time that the maximum

number of multicasts can be broadcasted.

Refer to the ELS10-26 MIB Reference Guide for a complete listing

and description of MIB variables.

3.14 MODIFYING MIB VARIABLES

Speciﬁc instructions for controlling ELS10-26 operations,

modifying parameters, and so on, depend on the NMS you are

using. This manual provides instructions for using LCM

commands. However, LCM commands do not exist for all

conﬁguration options. You may need to modify your conﬁguration

using an NMS.

This section provides several common MIB variables you may

want to change. Refer to the ELS10-26 MIB Reference Guide for a

complete listing and description of MIB variables.

Each variable is ﬁrst described in words, and is then identiﬁed in

MIB form, for example, lxadminGetPass - {lxadmin 3}. The Display

String line shows the range of values that can be used for the given

parameter. In each case, the DisplayString is a string of ASCII

characters.

3.15 SYSTEM CONTACT

The system contact parameter identiﬁes the contact person who is

responsible for operating the ELS10-26. Typically, this parameter

includes the person’s name, company or division name, and

telephone number.

sysContact - {system 4}

DisplayString (SIZE (0..255))

Conﬁguring Your ELS10-26

3-21

3.16 SYSTEM NAME

The system name is a name assigned to the ELS10-26 by the

network administrator. By convention, the system name is the fully

qualiﬁed domain name. (This name then becomes the LCM

prompt.)

sysName - {system 5}

DisplayString (SIZE (0..255))

3.16.1 System Location

The system location identiﬁes the physical location of the ELS10-

26.

sysLocation - {system 6}

DisplayString (SIZE (0..255))

3.16.2 Community Names

The set community name variable (from the Cabletron proprietary

MIB), must be initialized with the correct community name

passwords.

All requests from any SNMP manager contain a community name

ﬁeld. For set requests, the community name must match the set

password; otherwise, the request will be rejected by the ELS10-26.

For get requests, the community name must match either the set or

the get community name.

3-22

Conﬁguring Your ELS10-26

Set Community Name

The set community name variable (lxadminAnyPass) and get

community name variable (lxadminGetPass) must be set to the value

of the community name used by the SNMP manager for

performing either set or get operations. A zero length community

name means that any community name is acceptable.

lxadminAnyPass - {lxadmin 2}

DisplayString (SIZE (0..24))

lxadminGetPass - {lxadmin 2}

DisplayString (SIZE (0..24))

3.16.3 Aging Parameter

Dynamic (learned) addresses are automatically deleted from the

ELS10-26 Bridge Address Table after a certain length of time. The

aging time default is ﬁve minutes, as set by the IEEE 802.1d

standard. However, you can change the aging parameter with the

MIB variable dot1dTpAgingTime.

The ELS10-26 continually compares the actual age of each dynamic

address against the age speciﬁed by the dot1dTpAgingTime

parameter, and deletes any addresses that are older than the age

speciﬁed (or older than ﬁve minutes if you are using the default).

Typically, there is no need to set the aging time to a very small

number because the ELS10-26 Bridge Address Table supports 979

addresses.

4-1

CHAPTER 4

MONITORING AND MANAGING

YOUR ELS10-26

Monitoring the ELS10-26 consists of collecting and analyzing

statistics and system status information.

You can use the Select button on the front panel of the ELS10-26 to

monitor segment status on any of the Ethernet ports. Refer to

Section 2.1 for a description of the segment status options.

Basic management of the ELS10-26 consists of disabling or

enabling Ethernet ports, changing subnet masks, setting the

community name for the ELS10-26, and changing the baud rate for

your Local Console Manager (LCM) connection.

4.1 ELS10-26 MANAGEMENT TOOLS

LCM is a command-line interface built into the ELS10-26 that

enables you to monitor and manage the ELS10-26 through the out-

of-band RS232C connection attached to any non-intelligent

terminal. You can also use one of the following Cabletron Systems

Network Management Stations (NMSs), or a standard SNMP-

based NMS to manage the ELS10-26:

• SPECTRUM

• SPMA

• SPEL

• Any SNMP-based NMS

4.2 ELS10-26 STATISTICS

The ELS10-26 gathers statistics that can help you build a

comprehensive proﬁle of the network trafﬁc ﬂow between each

Local Area Network (LAN) you are connecting, as well as the

network trafﬁc ﬂow between each Ethernet port on the ELS10-26.

4-2

Monitoring and Managing Your ELS10-26

ELS10-26 statistics are divided into four groups:

• System statistics

• Ethernet port statistics

• Trafﬁc analysis statistics

• SNMP statistics

You can use this information to analyze your overall network

performance and to make conﬁguration changes as necessary. For

example, Ethernet port statistics can help you identify network

devices that require high bandwidth, and therefore should be

connected through a dedicated, rather than a shared, network

connection. In addition, Ethernet port statistics can help you

identify a network device that is the source of numerous multicast

packets due to a possible malfunction.

4.2.1 Gathering Statistics

For purposes of network management, managed objects must be

identiﬁed. Creation of a managed object is achieved by placing its

identiﬁer, and a set of management information appropriate to its

class, in the Management Information Database (MIB).

Using the MIB variables, you can obtain a detailed analysis of your

network by combining statistics for each source network,

destination network, and source and destination port. The

ELS10-26 MIB Reference Guide contains the SNMP MIB variables

you need to monitor and manage the ELS10-26.

4.2.2 System Statistics

For each ELS10-26, the following system statistics are available:

• The number of seconds since the ELS10-26 was last reset.

• The number of spanning tree topology changes that have

occurred since the ELS10-26 was last reset.

Monitoring and Managing Your ELS10-26

4-3

• The time since a topology change was last initiated.

• The physical location of the ELS10-26.

• The name and address of the contact person for the ELS10-26.

• The name of the ELS10-26.

• The current number of dynamic (learned) addresses.

4.2.3 Ethernet Port Statistics

For each Ethernet port connection on the ELS10-26, a number of

statistics are available. They can help you analyze both network

activity and utilization, and in some cases, indicate faulty

equipment or cabling.

• The number of non-unicast (multicast and broadcast) and

unicast packets received from the port.

The following statistics are available with SNMP:

• The number of bytes in the received packets.

• The number of bytes in the packets that were ﬁltered.

• The number of bytes in the packets that were forwarded.

• The total number of packets transmitted to the LAN.

Note: To check ELS10-26 system status using LCM, see Section 4.3.

Note: All statistics counters are cleared when the ELS10-26 is reset or

when the LCM clearstat command is used.

4-4

Monitoring and Managing Your ELS10-26

4.3 USING LCM TO CHECK ELS10-26 STATUS

The LCM commands that enable you to quickly check on the status

of the ELS10-26 include:

• Status

• Address display

• Ipaddr

• Ident

These LCM commands are described in the sections that follow.

4.3.1 Displaying Status

The status command displays the status of the ELS10-26 and

automatically pages through the status of all of the Ethernet ports,

pausing at each screen of information.

At the LCM prompt:

1. Type status

LCM displays the following type of information.

Note: You can also use the status command to display status for

individual Ethernet ports by typing status and specifying a port

number.

Monitoring and Managing Your ELS10-26

4-5

If you do not want to view the status of each Ethernet port, use

the Ctrl-C keys to return to the LCM prompt.

Software Currently Running: version xx.xx.xx software, Tue 08/23/94 15:0

Next Bootstrap (1st bank): version xx.xx.xx software Tue 08/23/94 15:03:

Power-up test failures: none

System Up Time: 2:25:57

Current Number of Learned Addresses: 133

CPU utilization is light.

Port RX Packets TX Packets Collisions Erred Packets

6978

1676

24 0 0 0 0

Type <CR> to display port 1 status...>

Port 1 Status

ELS10-26 > status 1

Type/Speed: 10B-TPX/10Mbits

Port Mirroring: No

Duplex Mode: Half Duplex

Bridging: Transparent Bridging

Enabled/Disabled: Enabled, Rip listening

Spanning Tree: Forwarding

Trunking State: Off

Pkts Transmitted: 1693

Pkts Received: 0

Carrier Losses: 1693

Total Collisions: 0

Excess Collisions: 0

RX Missed pkts: 0

RX Runt pkts: 0

RX FCS/Align Errs: 0

Internal TX Errs: 0

Type <CR> to display port 2 status...>

4-6

Monitoring and Managing Your ELS10-26

If you do not want to view the status of port 2, use the Ctrl-C

keys to return to the LCM prompt.

You can view the status for multiple of ports by typing status

and indicating the range of port numbers, for example status

2-6.

4.3.2 Displaying MAC Addresses

The addresses display command displays all MAC addresses in

the ELS10-26 Bridge Address Table. The display includes:

• The MAC address

• Type of address, including:

-Dynamic (learned)

-Ethernet port (for the MAC address of an Ethernet port)

-BPDU (the MAC address to which all BPDUs are directed)

-Reserved (an address reserved by 802.1d, but not yet

assigned)

-All LANs (addresses reserved by 802.1d for network

management)

• Port number

• Age (in seconds since a packet was last received from that

address)

The display automatically pauses with each screen of information.

Addresses are displayed in random order; for example, address

02:00:00:00:00:00 may appear after address 04:00:00:00:00:00.

The age will be the time since a packet was last received from that

address.

Monitoring and Managing Your ELS10-26

4-7

To display all MAC addresses, at the LCM prompt:

1. Type addresses display any

LCM responds with a list of all MAC addresses, their

associated ports, the type, age, and number of frames from and

to that address.

If you do not specify any, only the learned addresses are displayed.

To display a speciﬁc address, at the LCM prompt:

1. Type addresses display <MAC-ADDRESS>

For example, if you typed, addresses display

02:04:06:03:2a:43, LCM would display the following

information:

You can display a range of addresses by using a net mask. This is

helpful when determining the status associated with stations

containing the same make of Ethernet network interface cards. At

the LCM prompt:

1. Type addresses display <MAC-ADDRESS> <NET-MASK>

For example, to see all addresses that begin with 02:04:06, you

would enter:

addresses display 02:04:06:00:00:00 ff:ff:ff:00:00:00

Address Type Port Age(secs) Frames-From Frames-To

08:00:20:02:3a:44 Learned 3 26 1 0

Enter <CR> to continue, Ctrl-C to exit:

Address Type Port Age(secs) Frames-From Frames-To

02:04:06:03:2a:43 Learned 5 21 1181 73

4-8

Monitoring and Managing Your ELS10-26

LCM would display:

The ipaddr command displays the IP addresses, subnet masks, and

MAC addresses of all ELS10-26 ports. At the LCM prompt:

1. Type ipaddr

LCM displays the current IP address table, for example.

4.3.3 Displaying Manufacturing Information

The ident command identiﬁes ELS10-26 manufacturing

information, including the part number and any power-up test

codes and diagnostic data. To display the manufacturing

information, at the LCM prompt:

1. Type ident

LCM displays the following type of information:

Address Type Port Age(secs) Frames-From Frames-To

02:04:06:03:2a:43

02:04:06:00:2a:67

02:04:06:a3:70:2b

Learned

1181

3421

15339

235

Enter <CR> to continue, Ctrl-C to exit:

IP Address Address Mask MAC Address

192.138.217.1

0.0.0.0

192.138.217.10

0.0.0.0

192.138.217.20

192.138.217.50

192.138.217.30

255.255.255.0

255.0.0.0

255.255.255.0

255.0.0.0

255.255.255.0

00:40:27:00:06:1f

00:40:27:00:06:c3

00:40:27:00:06:3e

00:40:27:00:03:7a

00:40:27:00:05:c7

00:40:27:00:04:4a

00:40:27:00:06:9e

00:40:27:00:04:b4

Port

Part Number:

Power-up test codes:

Diagnostic data:

00000000 ff006000

501-3000-002

00000000 00000000 00000000 00000000

00000000 00000000 fffffffc fffffffc

X70002e4-0006891

Up-Link Module Part Number: 123-4567-891 X1234567-1234567

Monitoring and Managing Your ELS10-26

4-9

4.4 MANAGING THE ELS10-26

Managing the ELS10-26 consists of:

• Disabling and enabling Ethernet ports

• Changing a subnet mask

• Changing a community name

• Setting the baud rate of your terminal connection

• Setting a reboot time

You can use the Local Console Manager (LCM), any of the

Cabletron Systems NMSs, or a standard SNMP-based NMS to

manage the ELS10-26. Refer to Section 4.1.

4.5 USING LCM TO MANAGE THE ELS10-26

The LCM commands that enable you to manage the ELS10-26

include:

• Disable

• Enable

• Ipaddr

• Community

• Baud

• Reboot

These LCM commands are described in the sections that follow.

4-10

Monitoring and Managing Your ELS10-26

4.5.1 Disabling a Port

There can be times when you need to disable a speciﬁc Ethernet

port, for example, after you have determined that there is faulty

equipment. Disabling a port effectively stops all bridging functions

for that port. Disabled ports do not accept SNMP packets, and

therefore cannot communicate with an NMS.

To disable a port, or port range, at the LCM prompt:

1. Type disable <PORT-RANGE>

For example, disable 7-9 would disable ports 7, 8, and 9.

LCM responds:

Once an Ethernet port is disabled, it will be disabled until you

enable it again. Resetting the ELS10-26 will not enable a port that

has been disabled.

4.5.2 Enabling a Port

When you enable an Ethernet port that has been disabled,

whatever bridging functions you had previously conﬁgured for

that port are re-enabled.

To enable a port, or a range of ports, at the LCM prompt:

1. Type enable <PORT-RANGE>

Caution: If you disable the port through which someone is remotely

managing the ELS10-26, that person will not be able to

communicate with the ELS10-26. Use the LCM command

addresses display to find the port number you are using

to manage the ELS10-26.

Port 7: Disabled

Port 8: Disabled

Port 9: Disabled

Monitoring and Managing Your ELS10-26

4-11

For example, enable 7-9 would enable ports 7, 8, and 9.

LCM responds:

noRIP Option

The Routing Information Protocol (RIP) is one of the protocols that

allows the ELS10-26 to build an accurate, current routing table.

This table includes the networks it knows about, the next hop, and

the number of hops to get there. RIP enables you to use an NMS to

remotely manage the ELS10-26 through a router.

The noRIP option allows you to turn off the routing information

that builds the routing table. You would use this option when you

are connecting network devices that do not support RIP.

4.5.3 Changing a Subnet Mask

You can optionally set the subnet mask for a port. A subnet mask is

a 32-bit address mask used in IP to specify a particular subnet. If

the subnet mask is 0.0.0.0, the ELS10-26 automatically converts the

displayed mask to the standard default, based on the port’s IP

address class. (Class A address masks are 255.0.0.0, Class B address

masks are 255.255.0.0, Class C address masks are 255.255.255.0.)

To display IP addresses, subnet masks, and MAC addresses of all

ports on the ELS10-26 you are managing, at the LCM prompt:

1. Type ipaddr

Note:

Rip listening

means that the ELS10-26 is in listening mode

only. No RIP packets are created.

Port 7: Enabled, Rip listening

Port 8: Enabled, Rip listening

Port 9: Enabled, Rip listening

4-12

Monitoring and Managing Your ELS10-26

LCM displays the current IP address table, for example:

To change the subnet mask, at the LCM prompt:

1. Type ipaddr <PORT-NUMBER> <IP ADDRESS> <SUBNET MASK>

For example, ipaddr 6 192.138.217.40 255.255.240.0 would set

the subnet mask for port 6 to 255.255.240.0. LCM responds by

redisplaying the address table.

To assign a new IP address, refer to Section 3.1.

4.5.4 Changing a Community Name

A community name is similar to a password. You use the same

steps to assign a new community name or to change an existing

community name. This sets the MIB variable sxadminAnyPass. You

can then enter a community name to perform any SNMP sets.

To assign a community name, at the LCM prompt:

1. Type community

2. Enter the old community name.

If one has not been assigned, you do not need to enter

anything. LCM prompts you for the new community name.

Note: When you change the subnet mask for a port, you must also enter

the IP address for that port. Make sure you enter the IP address for

the port correctly; whatever you enter becomes the IP address.

Port IP Address Address Mask MAC Address

192.138.217.1

0.0.0.0

192.138.217.10

0.0.0.0

192.138.217.20

192.138.217.50

255.255.255.0

255.0.0.0

255.255.255.0

255.0.0.0

255.255.255.0

00:40:27:00:06:1f

00:40:27:00:06:c3

00:40:27:00:06:3e

00:40:27:00:03:7a

00:40:27:00:05:c7

00:40:27:00:04:4a

00:40:27:00:06:9e

Monitoring and Managing Your ELS10-26

4-13

3. Enter the new community name.

LCM prompts you to verify the new community name by

retyping it.

4. Retype the new community name.

4.5.5 Setting the Baud Rate

You can set the baud rate for your LCM console connection. The

options for baud rate include:

• 1200

• 2400

• 4800

• 9600

• 19200

The default rate is 9600.

To display the current baud rate setting, at the LCM prompt:

1. Type baud

LCM responds:

Note: Make sure that the baud rate you set matches the baud rate setting

for the terminal you are using.

Usage: baud [1200|2400|4800|9600|19200]

Baud rate is 4800.

4-14

Monitoring and Managing Your ELS10-26

To change the baud rate setting, at the LCM prompt:

1. Type baud <baud rate>

For example, baud 9600 would set the baud rate to 9600.

LCM responds:

4.5.6 Setting a Reboot Time

You can enter the number of seconds the ELS10-26 waits before

rebooting. At the LCM prompt:

1. Type reboot <time interval>

For example, reboot 60

LCM responds:

Baud rate is 9600.

Reboot pending in 59 seconds.

5-1

CHAPTER 5

ELS10-26 DIAGNOSTICS AND TROUBLESHOOTING

The ELS10-26 incorporates built-in diagnostic and testing

capabilities which are convenient to use and cause minimal or no

disruption to the rest of the operational network. These capabilities

are effective for isolating problems within the ELS10-26 unit. Built-

in diagnostic capabilities include:

• System-wide power-up diagnostics, which are run every time

the system is powered up or reset.

5.1 POWER-UP DIAGNOSTICS

The ELS10-26 performs an extensive set of diagnostic self-tests

whenever any of the following events occur:

• Power-up

• Reset using the front panel Reset button (a hard reset)

• Reset via the NMS (a soft reset)

• Automatic reset in response to a non-recoverable failure

The power-up diagnostics test processors, memory, and other

critical hardware components of the ELS10-26. All diagnostic

software is stored in non-volatile memory.

5.1.1 Power-up LED Sequence

When you power-up the ELS10-26, the following occurs:

1. All LEDs turn on for one second.

2. The Power (Pwr) LED and all of the status LEDs remain on.

3. The CPU LED starts ﬂashing.

4. All LEDs on ports 1 - 24 will go on in sequence and then go

out.

5-2

ELS10-26 Diagnostics and Troubleshooting

5. After several more seconds, the CPU LED will stay on,

indicating that the power-up diagnostics sequence is

complete.

In addition, the Port Link LEDs will turn on for those ports

with good links and the Segment Status LEDs will turn on (or

ﬂash) when the selected status condition is present.

5.1.2 Speciﬁc Power-up Tests

The power-up diagnostic tests performed on the ELS10-26 include:

• ROM checksum test

• Instruction/Data memory test

• FLASH checksum test

• NVRAM checksum test

• Ethernet data loopback test

5.1.3 Software Checksum Comparison

When the ELS10-26 reboots, its operational software is veriﬁed by

a checksum comparison before it is loaded. If the software fails the

checksum test due to an interrupted new software distribution

procedure, the ELS10-26 will automatically use its backup version

of software. A backup version of software is always stored in non-

volatile memory.

Note: If a critical component fails diagnostics, the CPU LED will turn off

and the ELS10-26 will attempt to reboot. If the CPU LED does not

stay on, contact Cabletron Systems Global Call Center. Refer to

Section 1.2.

ELS10-26 Diagnostics and Troubleshooting

5-3

The operational parameters of the ELS10-26 software are also

protected by a checksum comparison. When the ELS10-26 reboots,

if the operational parameters of the ELS10-26 fail a checksum test

due to a power failure in the midst of a previous update, the

ELS10-26 automatically uses its backup version of the parameters.

5.1.4 Power-up Diagnostics Results

After completion of the power-up diagnostic sequence, both the

Power (Pwr) and Ready LEDs located on the front panel of the

ELS10-26 should be on.

5.2 RESPONSES TO FAILURES AT POWER-UP

How the ELS10-26 responds to failures detected during power-up

depends on the seriousness of the failure. For example, it will

operate if a non-critical component, such as the out-of-band

management port, fails diagnostics. However, in the event of a

critical failure, such as a failure of the main element processor, the

ELS10-26 will halt execution and will not boot to operational

mode.

5.3 STATUS AND ACTIVITY INDICATORS

The front panel of the ELS10-26 includes LEDs that indicate the

status or activity of various system components. Figure 5-1 shows

the ELS10-26 front panel LEDs and buttons. The LEDs and buttons

are described in Tables 5-1 and 5-2.

Note: A backup version of the operational parameters is always stored in

non-volatile memory before any update is attempted.

5-4

ELS10-26 Diagnostics and Troubleshooting

Figure 5-1. ELS10-26 Front Panel LEDs

ELS10-26TX

STATUS

PORT STATUS MODE

10BASE-T/

100BASE-TX

FEPIM

2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

TX ACT FDX MON

RX COL 100 USR

PWR

CPU

RESET

MON

COM

Port Link LEDs Port Status LEDs

Segment Status LEDs

Segment Status Option Select Button

(lower row)

(upper row)

Power and

CPU LEDs

ELS10-26 Diagnostics and Troubleshooting

5-5

Table 5-2 describes the ELS10-26 buttons.

Table 5-1. Meaning of ELS10-26 LEDs

LED Meaning

Port Status

Mode

ACT

COL

FDX

100

MON

USR

On – Indicates port is transmitting a packet.

On – Indicates port is receiving a packet.

On – Indicates port is transmitting or receiving.

On – Indicates a collision on a port.

On - Port is operating in Full Duplex.

Off - Port is operating in Half Duplex.

On - Autonegotiatian status, port operating at 100

Mbps.

Off - Port operating at 10 Mbps.

On - Indicates the port is copying to the monitor

port.

On - Indicates that errored packets were received.

Link

(Individual

Ports)

On – Indicates the link is good.

Off – Indicates there is no link.

Status

(Individual

Ports)

On/Blinking – Indicates you are monitoring the

port for a selected segment status condition. This

LED always indicates one of the status modes.

Table 5-2 Description of ELS10-26 Buttons

Button Function

Status Cycles through the Segment Status options (TX, RX, Act,

Col, and Usr) for all ports. The lower port status LEDs of

the ports you are monitoring are activated based on what

function you chose with the Select button.

Reset Restarts the ELS10-26.

5-6

ELS10-26 Diagnostics and Troubleshooting

5.4 TROUBLESHOOTING

This section lists several situations that could happen while using

the ELS10-26, and suggests appropriate action. Because every

situation is potentially unique, the corrective actions suggested

here should be considered as guidelines only.

5.5 ELS10-26 DOES NOT POWER UP

If your ELS10-26 does not power up, check each one of the

following:

• Make sure the power source is operational.

• Make sure the power cord is securely connected.

If the ELS10-26 still does not power up, contact Cabletron Systems

Global Call Center. Refer to Section 1.2 for more information.

5.5.1 Connectivity Problems

• Check for LED abnormalities.

• Check port status using LCM.

• Check for loose port connections.

• Check to see if the number of carrier losses is increasing using

LCM. This indicates that the connection is suspect.

• Check to see if the number of total collisions has dramatically

increased using LCM.

ELS10-26 Diagnostics and Troubleshooting

5-7

5.5.2 ELS10-26 Has Rebooted

• Use the LCM ident command to check the ELS10-26 diagnostic

codes, and call your authorized Cabletron Systems

representative.

5.5.3 ELS10-26 Does Not Respond to NMS

• Check the port status using LCM.

• Check to see if the Spanning Tree topology is stable using LCM.

• Check that a pathway to the ELS10-26 exists.

• Verify the ELS10-26’s IP address using LCM.

5-8

ELS10-26 Diagnostics and Troubleshooting

A-1

APPENDIX A

TECHNICAL SPECIFICATIONS

A.1 ELS10-26 SPECIFICATIONS

Physical

Height 1.75 in (4.45 cm)

Width 17 in (43.18 cm)

Depth 15.75 in (40 cm)

Weight 9 lb (4.1 kg)

Installation options Tabletop or rack-mount

Electrical

Input voltage Auto-ranging from 100-120,

200-240 Vac

Frequency 50/60 Hz

AC power consumption 80 watts

Connector Ports

25 RJ45 Ethernet ports (MDI-X)

1 RJ45 Fast Ethernet port

1 RJ45 Monitor Port (MDI-X)

1 RS232C port for Local Console Manager (LCM)

1 slot for optional Fast Ethernet Port Interface Module

A-2

Technical Speciﬁcations

Environmental

Operating temperature 5° to 40° C (41° to 104° F)

Storage temperature -30° to 73° C (-22 ° to 164° F)

Operating relative humidity 5% to 90% (non-condensing)

Diagnostic LEDs

Individual port link status

Individual port segment status

Segment status, specifying:

- Transmit activity

- Receive activity

- Both Transmit and Receive activity

- Collision

- 100 (Mbps)

- Duplex

- MON (monitor)

- User-deﬁned

CPU

Power (Pwr)

Standard Support

• IEEE 802.1 Part D

• IEEE802.2 (Logical Link Control)

• IEEE 802.3 (CSMA/CD, 10BASE-T) Ethernet

Technical Speciﬁcations

A-3

• Transparent Bridging with Spanning Tree

• Ethernet Version 2

• EIA RS232C (DTE-to-DCE Interface Speciﬁcation)

• EIA RS-310-C (Rack-mount Speciﬁcation)

Address Table Size

979 dynamic entries

Management Support

• MIB II, 802.1d, 802.3, and Cabletron Enterprise MIB

• Cabletron Systems Local Console Manager (LCM)

• Any SNMP-based network management system

Regulatory Compliance

Safety UL 1950, CSA C22.2 No. 950,

EN 60950, and IEC 950, 73/23/EEC

Electromagnetic Compatibility FCC Part 15 , EN 55022,

EN50082-1, 89/336/EEC CSA

C108.8, VCCI V-3 AS/NZS 3548

EN 50082-1

A.2 SERIAL CABLE PIN ASSIGNMENTS

For a PC running a Windows terminal connected to the RS232C

Network Management Port on the front panel of the ELS10-26, the

following serial cable pin assignments (tables A-1 and A-2) are

required to manage the ELS10-26 using the Local Console Manager

(LCM).

A-4

Technical Speciﬁcations

Table A-2. DB9 Pin Assignments

A.3 10BASE-T PIN ASSIGNMENTS

An Ethernet twisted-pair link segment requires two pairs of wires.

Each wire pair is identiﬁed by solid and striped colored wires. For

example, one wire in the pair might be red and the other wire, red

with white stripes.

Connectors

Refer to the diagram below and note how the pins are numbered.

Be sure to hold the connectors in the same orientation when

connecting the wires to the pins.

Figure A-1. Connector Pin Numbers

Table A-1. DB25 Pin Assignments

ELS10-26 RJ45 (female) DB25-pin (female)

Pin 1 (Tx) Pin 3

Pin 4 (Rx) Pin 2

Pin 5 (GND) Pin 7

ELS10-26 RJ45 (female) DB9 pin (female)

Pin 1 (Rx) Pin 2

Pin 4 (Tx) Pin 3

Pin 5 (GND) Pin 5

Technical Speciﬁcations

A-5

Each twisted-pair link segment must have a male connector attached to

both ends. According to the 10BASE-T speciﬁcation, pins 1 and 2 on the

connector are used for receiving data; pins 3 and 6 are used for

transmitting data, as shown in Table A-3.

a. The “+” and “-” signs are used to represent the polarity of the two

wires that make up each wire pair.

A.4 STRAIGHT-THROUGH WIRING

If the twisted-pair link segment is to join two ports on a switch,

and only one of the ports has an internal crossover, the two pairs of

wires must be straight-through, as shown in Table A-4.

Table A-3. 10BASE-T Pin Assignments

Pin Assignmenta

1 Rx+

2 Rx-

3 Tx+

6 Tx-

Table A-4. Straight-Through RJ45 Pin Assignments

ELS10-26 (Crossed) Device (Not Crossed)

1 (Rx+) 1 (Tx+)

2 (Rx-) 2 (Tx-)

3 (Tx+) 3 (Rx+)

6 (Tx-) 6 (Rx-)

A-6

Technical Speciﬁcations

A.5 CROSSOVER WIRING

Two ELS10-26s can communicate only if the transmitter on one

unit is connected to the receiver on the other unit. This reversal, or

crossover function, can be implemented either in the wiring or in

the device itself. When connecting ELS10-26s, a crossover must be

implemented in the wiring. Refer to Table A-5 for crossover pin

assignments.

A.6 5 - 4 - 3 RULE

Between any two nodes (i.e., PCs or other stations) on the network,

there can be:

• Up to ﬁve segments in series

• Up to four repeaters or multi-port hubs

• Up to three populated segments (that is, segments attached to

two or more PCs). The remaining two segments are

unpopulated; these are known as inter-repeater links or IRLs.

This distinction between populated and unpopulated segments

is signiﬁcant for coax networks only.

Table A-5. Crossover RJ45 Pin Assignments

ELS10-26 ELS10-26

1 (Rx+) 3 (Tx+)

2 (Rx-) 6 (Tx-)

3 (Tx+) 1 (Rx+)

6 (Tx-) 2 (Rx-)

Note: This rule is completely consistent with the IEEE 802.3

specification, and is meant only to summarize the configuration

specification.

Technical Speciﬁcations

A-7

A.7 FEPIM SPECIFICATIONS

The ELS10-26 uses a Fast Ethernet Interface Module (FEPIM) to

provide front panel cable connections. FEPIMs are user-installable.

See Section 2.2, Installing an FEPIM.

FE-100TX

The FE-100TX is an RJ45 connector supporting Unshielded Twisted

Pair (UTP) cabling.

The slide switch on the FE-100TX determines the crossover status

of the cable pairs. If the switch is on the X side, the pairs are

internally crossed over. If the switch is on the = side, the pairs are

not internally crossed over. Figure A-2 shows the pinouts for the

FEPIM-100TX in both positions.

Figure A-2. FE-100TX Pinouts

FE-100FX

The FE-100FX shown in Figure A-3 supports multimode ﬁber optic

cabling. The FE-100FX is equipped with an SC style port.

Speciﬁcations for the FE-100FX are listed below.

Position X

(crossed over)

1. RX+

2. RX-

3. TX+

4. NC

5. NC

6. TX-

7. NC

8. NC

FE-100TX

100

Position =

(not crossed over)

1. TX+

2. TX-

3. RX+

4. NC

5. NC

6. RX-

7. NC

8. NC

A-8

Technical Speciﬁcations

Figure A-3. FE-100FX

The transmitter power levels and receive sensitivity levels listed

are Peak Power Levels after optical overshoot. A Peak Power

Meter must be used to correctly compare the values given above to

those measured on any particular port. If Power levels are being

measured with an Average Power Meter, add 3 dBm to the

measurement to compare the measured values to the values listed

above.

Table A-6. Transmitter Power

Cable Type Worst Case Budget Typical Budget

50/125 µm ﬁber 6.0 dB 9.0 dB

62.5/125 µm ﬁber 9.0 dB 12.0 dB

100/140 µm ﬁber 15.0 dB 18.0 dB

FE-100FX

B-1

APPENDIX B

GLOSSARY

address

A set of characters that uniquely identiﬁes a station, peripheral

device, node, or other unit in a network.

address table

A database of device addresses and their associated ports

maintained by a switch or bridge for use in making data packet

forwarding and ﬁltering decisions.

agent

Network management software that runs within a managed

network device.

alarm

See trap.

ANSI

American National Standards Institute – One of several

organizations that establishes standards that apply to

internetworking.

ARP

Address Resolution Protocol – An auxiliary protocol of the IP layer

used to perform dynamic address translation between MAC

addresses and internet addresses. Binds IP addresses to speciﬁc

MAC addresses.

attenuation

The amount of power (or light) lost as power travels through a

medium from the transmitter to the receiver. Difference between

transmitted and received power, in decibels (dB).

AUI (attachment unit interface)

A standard connector type used for Ethernet connections.

B-2

Glossary

backbone

The major, central transmission path for a network. A backbone

usually handles high-volume, high-density trafﬁc. Typically a

backbone connects various LANs into an integrated network.

bandwidth

A measure of the amount of trafﬁc a given medium can handle at

one time: The communications capacity (measured in bits per

second), of a transmission line or of a speciﬁc path through a

network. Greater bandwidth generally means more information

can be sent through a circuit during any given period of time.

BPDU (bridge protocol data unit)

A data unit transmitted as part of the IEEE 802.1d Spanning Tree

Protocol. The exchange of BPDUs allows bridges within a network

to logically conﬁgure the network as a single spanning tree.

bps (bits per second)

The basic unit of data communications rate measurement.

bridge

An intelligent, protocol independent device used to connect

similar or dissimilar LANs.

bursty

Adjective used to describe sporadic heavy volumes of network

trafﬁc (e.g., bursty trafﬁc).

bypass

Optical or electronic isolation of a station from the network. A

bypass situation typically occurs as a result of a station failure or

shutdown; the bypass allows the network to function normally,

except for the absence of the missing station.

concentrator

A device that provides attachment points for stations that are not

connected to the ELS10-26. The concentrator is connected directly

to the network; the stations connect to the concentrator.

Glossary

B-3

congestion

A condition where a portion of the network is overloaded with

more data than can be transmitted in the desired time period.

CSMA/CD (carrier-sense multiple access with collision

detection)

A channel access (contention) method that requires each station to

wait for an idle channel before transmitting. In addition, stations

are able to detect overlapping transmissions (collisions) and

retransmit in the event of a data collision.

data link layer

Layer 2 in the OSI model. Deﬁnes frame construction, addressing,

error detection, and other services to higher layers.

datagram

Abbreviated and connectionless single-packet message sent from

one station to another.

data rate (or speed)

The maximum number of bits of information that can be

transmitted per second.

downstream

Refers to the relative position of a station in a network to another

station in the same network. A station is downstream from another

station if it receives data after the other station receives data.

dynamic address

An address “learned” by the ELS10-26, as opposed to addresses

that are manually entered into the Bridge Address Table. The

ELS10-26 “learns” addresses by reading them from the data

packets it processes.

EIA (Electronic Industries Association)

Organization that sets standards for electrical interfaces

(connectors).

B-4

Glossary

encapsulation

A method for moving messages across networks that use different

types of protocols. The message is encapsulated (rather than

translated), so it can move across a network that otherwise could

not understand its protocol. Encapsulating bridges and switches

generally use proprietary encapsulation schemes.

encode

To translate data into a series of electrical or optical pulses that can

travel efﬁciently over a cable or other medium.

entity

An active element within an Open Systems Interconnection (OSI)

network layer or sublayer.

extended LAN

A collection of LANs interconnected by protocol-independent

bridges or switches.

ﬁltering rate

A measure (in packets per second) of the ELS10-26’s efﬁciency in

examining each frame, comparing it with an address table, and

then deciding whether to discard the frame or forward it.

forwarding rate

The rate (in packets per second) at which the ELS10-26 can receive

a stream of packets from one network segment, complete all

processing, and transmit the packets to another network segment.

frame

A data message that includes a source address, destination

address, data, frame check sequence (FCS), and control

information.

full wire speed

Refers to packet forwarding at the maximum rate at which data

can be transmitted on a given LAN.

Glossary

B-5

ICMP (Internet control message protocol)

An auxiliary protocol of IP used to convey advice and error

messages about events in the IP layer.

IEEE (Institute of Electrical and Electronic Engineers)

International professional society which issues networking and

other standards. The IEEE created the 802 family of LAN

standards.

IEEE 802.2

The data link layer standard; used with IEEE 802.3, 802.4, 802.5,

and other LAN/WAN protocols.

IEEE 802.3

The physical layer standard that uses the CSMA/CD access

method on a bus topology LAN.

IEEE 802.6

Standard for metropolitan area networks (MANs) currently under

development.

initialization

Transition of a device or network from startup state to operational

state.

intelligent bridge/switch

A bridge/switch that is able to identify source and destination

addresses.

internet

A large communications infrastructure composed of wide and

local area networks. A generic reference to a network built using

internetworking technology.

Internet

A large collection of connected networks which use TCP/IP. (Also

referred to as the DARPA Internet, NSF/DARPA Internet or the

Federal Research Internet.)

B-6

Glossary

internetworking

The linking of one or more networks to facilitate communication

across networks.

interoperability

The ability of equipment from multiple vendors to exchange

information using standardized protocols.

IP (Internet protocol)

IP is the basic datagram protocol used at the network layer of the

TCP/IP stack.

ISO (International Standards Organization)

An organization that creates, controls and publishes standards.

jitter

Clocking deviation on a network.

Kbps (kilobits per second)

1,000 bits per second.

LAN (local area network)

A network that interconnects a variety of devices (computers,

printers, servers, and so on), within a limited geographical area. A

LAN typically connects devices within a building or campus.

link-loss budget

Each connection (link) in an optical system results in a certain

amount of signal strength loss. Link-loss budget refers to the

process of calculating link loss for the entire system. If the total link

loss exceeds a certain limit, the system will not function.

LLC (logical link control)

A part of the data link layer of the OSI model that deﬁnes the

transmission of a frame of data between two stations (with no

intermediate switching nodes).

local trafﬁc

Trafﬁc within a given network segment.

Glossary

B-7

MAC (media access control)

The data link layer sublayer responsible for scheduling,

transmitting, and receiving data on a shared medium local area

network.

mask

Speciﬁed a subset of a larger set of data to be included for

comparison and analysis. For example, in switch ﬁltering, a mask

might be conﬁgured to include only the ﬁrst four address bits as

the basis for ﬁltering decisions.

Mbps (megabits per second)

1 million bits per second.

MIB (management information base)

A collection of objects unique to a speciﬁc device that can be

accessed via a network management protocol. The ELS10-26 has its

own MIB.

multicast

Packets destined for more than one address.

multicast (broadcast) storm

Excessive multicast packet trafﬁc, typically generated by a faulty

device. Multicast storms can cause severe network performance

problems.

network

Interconnected computer systems, terminals, and data

communication facilities. A network must have at least three

endpoints and may have any number of links and nodes.

node

Any device connected to a communication network, for example a

computer, workstation, printer, server, concentrator, bridge, and

switch.

B-8

Glossary

OSI (Open Systems Interconnection)

Refers to the OSI reference model, a logical structure for network

operations. OSI is the internationally accepted framework of

standards for internetwork communication.

packet

A group of bits including data and control elements arranged in a

speciﬁc format that are transmitted and switched as a composite

whole. Control elements include a source address, destination

address, frame control and status indicators, and a Frame Check

Sequence (FCS).

PDU (protocol data unit)

The portion of a datagram that contains the data associated with a

particular protocol.

peer-to-peer

Term used to describe data transmission between entities in the

same sublayer of the OSI model.

physical layer

Layer 1 of the OSI model. Deﬁnes and handles the electrical and

physical connections between systems.

power budget

The difference between transmit power and receiver sensitivity,

including any safety margins.

PPP (point-to-point protocol)

A protocol for transmitting datagrams (IP or MAC packets) over a

serial point-to-point link (e.g., the out-of-band management port).

pps (packets per second)

Unit of measure used to express packet data throughput. 18 pps is

approximately equal to 9600 bps.

propagation delay

The time it takes for a signal to travel across a network.

Glossary

B-9

protocol

A set of rules used by computers and related devices to

communicate with each other.

protocol suite

A group of protocols related to a common framework.

RARP (reverse address resolution protocol)

A protocol that binds MAC addresses to speciﬁc IP addresses.

RISC (Reduced Instruction Set Computing)

A data processing technology in which functions are performed

using the least possible number of instructions to yield very fast

processing.

segment

When two or more networks are interconnected to form an

internetwork, the original networks are referred to as segments.

service

A set of functions offered to a user by a provider.

SNMP (simple network management protocol)

A TCP/IP protocol for communication between a network

management system and a network device.

source address ﬁltering

A switch or bridge function that forwards or rejects data,

depending on the data's source address.

static address

Addresses manually entered into the Bridge Address Table (as

opposed to those automatically learned by the ELS10-26).

STP (spanning tree protocol)

A protocol that ensures that only one path will be used between

two devices; prevents active loops (multiple paths to devices), by

closing redundant paths. With STP operating, a redundant link

serves as a backup link only if a normal path fails.

B-10

Glossary

switch

An intelligent, protocol independent device used to connect

similar or dissimilar LANs.

symbol

The smallest signaling element used by the MAC sublayer. Each

symbol corresponds to a speciﬁc sequence of code bits to be

transmitted by the physical layer.

synchronous transmission

A transmission technique in which an uninterrupted block of data

is transmitted, using no redundant information such as stop and

start bits to identify the beginning and end of a unit of data.

TCP/IP (transmission control protocol/Internet protocol)

Internetworking protocols sometimes referred to as the Internet

suite of protocols.

topology

The arrangement of devices and cable paths that make up a

network.

translating bridge

A bridge that can pass data between LANs that use different

protocols.

translation

Modiﬁcation of data packets from one type of network so they can

be used on a different type of network (e.g., Ethernet to FDDI

translation).

trap

Alarm; notiﬁcation of an event that has occurred on a network.

Some alarms require intervention or action by the network

administrator; some are merely informational.

UDP (user datagram protocol)

A TCP/IP protocol for the connectionless transport layer.

Glossary

B-11

upstream

Refers to the relative position of a station in a network to another

station in the same network. A station is upstream from its

neighbor if it receives data before its neighbor receives the data.

WAN (wide area network)

A communication network that spans a large geographic area.

B-12

Glossary

I-1

INDEX

Numerics

10BASE-T

connection 2-10

10BASE-T pin assignments A-4

5 - 4 - 3 rule A-6

802.1D Spanning Tree 3-10

adding

IP addresses 3-3

address table

dynamic entry 1-10

size A-3

addresses

adding

IP 3-3

deleting

IP 3-4

displaying

IP 3-4, 4-8, 4-11

aging time, defined 3-22

assigning

community name 3-18, 4-12

IP addresses 3-3

authentication password,

defined 3-21

basic LCM commands 1-20

baud rate

displaying 4-13

for ASCII terminal 2-9

setting 4-13

BPDU (Bridge Protocol Data

Unit) 3-5

Bridge Address Table,

defined 1-9

Bridge Protocol Data Unit

(BPDU) 3-5

bridging functions

disabling 3-6

displaying 3-6

enabling 3-6

bridging technologies A-2

certification A-3

changing

subnet mask 3-5, 4-12

checksum comparison test 5-2

community name, assigning 3-

18, 4-12

connecting

ASCII terminal 2-9

LCM 2-9

Connecting to the network 2-9

connectivity problems,

troubleshooting 5-6

connector ports A-1

connectors

AUI 1-5

RJ-45 1-5, A-4

RS-232-C 1-5

conventions,

LCM command 1-19

crossover cabling 3-7

Crossover switch A-7

crossover wiring A-5

deleting

IP addresses 3-4

Description 2-4

diagnostics

checksum comparison 5-2

overview 5-1

power-up 2-8, 5-1

Index

I-2

disabling

bridging functions 3-6

ports 4-10

trunking 3-10, 3-14

displaying

baud rate 4-13

bridge functions 3-6

FastNET 10 status 4-4

IP addresses 3-4, 4-8, 4-11

MAC addresses 4-7

manufacturing

information 4-8

Document Conventions 1-3

dynamic entry

Bridge Address Table 1-10

enabling

bridging functions 3-6

Ethernet ports 4-10

trunking functions 3-9

environmental specifications A-2

erase configuration 3-2

Ethernet port statistics 4-3

FastNET 10

management tools 4-1

FastNET 10

Bridge Address Table 1-9

certification A-3

managing of 4-9

power-up diagnostics 5-1

sample applications 1-11,

1-12

specifications A-1

statistics 4-1

FastNET 10 diagnostics 5-1

FE-100FX

transmitter power A-8

Fiber connection

SC to SC 2-13

IP addresses

assigning 3-3

deleting 3-4

displaying 3-4, 4-8, 4-11

IP subnet mask,

changing 3-5, 4-12

LCM

connecting 2-9

description of 1-18, 4-1

LCM command syntax 1-19

LCM commands

addresses display 4-6, 4-10

bridge 3-5

community 3-18, 4-12

disable 4-10

enable 4-10

erase 3-2

exit 1-22

ident 4-8

ipaddr 3-4, 4-8

reboot 4-14

status 4-4

trunk 3-9

LED sequence

power-up 5-1

Local Console Manager. See

LCM 1-18, 4-1

local traffic

defined 1-8

MAC addresses, displaying 4-7

management tools 4-1

manufacturing information,

displaying 4-8

Meaning 2-3

MIB variables, modifying 3-20

modifying

MIB variables 3-20

Index

I-3

multicast storm protection

defined 3-19

MIB variables 3-19

Network connection

FE-100FX 2-13

FX-100TX 2-11

non-volatile memory 5-3

noRIP option 4-11

or 1-22

OSI Reference Model 1-7

pin assignments

10BASE-T A-4

straight-through RJ-45 A-5

Port Link LEDs 2-3, 5-5

Port Status LEDs 2-3, 5-5

ports

disabling 4-10

enabling 4-10

Power (Pwr) LED 2-3

power-up

LED sequence 2-8, 5-1

power-up diagnostics 2-8, 5-1

results 5-3

specific tests 5-2

rack-mount installation 2-7

Ready LED 2-3

reboot 4-14

Reset button 2-4, 5-5

Routing Information Protocol

(RIP) 4-11

Segment Status LED 2-3, 5-5

Select button 2-4, 5-5

serial cable

DB-9 (female) A-3

DB-9 (male) A-4

pin assignments A-3

set password, defined 3-22

setting baud rate 4-13

SNMP statistics 4-2

Spanning Tree algorithm 1-9

specifications

electrical A-1

physical A-1

statistics

Ethernet port 4-3

gathering 4-2

overview 4-2

system 4-2

status, displaying

FastNET 10 4-4

straight-through wiring A-5

subnet mask, IP, changing 3-5,

4-12

syntax, LCM command 1-19

system contact, defined 3-20

system location, defined 3-21

system name, defined 3-21

system statistics 4-2

troubleshooting

connectivity problems 5-6

NMS problems 5-7

power up 5-6

trunking

broken 3-12, 3-15

closed 3-12, 3-15

configuring groups 3-8

disabled 3-12, 3-15

heldown 3-12, 3-15

joined 3-12, 3-15

overview of 3-7

turning on 3-9

Index

I-4

wiring

crossover A-6

straight-through A-5

Cabletron Systems Els10 26Tx Users Manual

ELS10-26TX to the manual cf4e46f0-1c89-49b0-a477-ca07b84907ea

Navigation menu

Versions of this User Manual:

Views

Navigation