Cabletron Systems Els10 26Tx Users Manual

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

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SmartSTACK 10
ELS10-26 USER GUIDE

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9032243-01

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Only qualified personnel should perform installation
procedures.

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.
 Copyright 1997 by Cabletron Systems, Inc., P.O. Box 5005, Rochester, NH 03866-5005
All Rights Reserved
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.

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
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
Copyright Act of the United States or as authorized in writing by Cabletron.

OTHER RESTRICTIONS. You may not reverse engineer, decompile, or disassemble the
Program.

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.

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.

iii

Notice
DECLARATION OF CONFORMITY

Application of Council Directive(s):

Manufacturer’s Name:
Manufacturer’s Address:

European Representative Name:
European Representative Address:

Conformance to Directive(s)/Product Standards:

Equipment Type/Environment:

89/336/EEC
73/23/EEC
Cabletron Systems, Inc.
35 Industrial Way
PO Box 5005
Rochester, NH 03867
Mr. J. Solari
Cabletron Systems Limited
Nexus House, Newbury Business Park
London Road, Newbury
Berkshire RG13 2PZ, England
EC Directive 89/336/EEC
EC Directive 73/23/EEC
EN 55022
EN 50082-1
EN 60950
Networking Equipment, for use in a
Commercial or Light 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
___________________________________
Full Name

Mr.
J. Solari
___________________________________
Full Name

Principal
Compliance Engineer
___________________________________
Title

Managing
Director - E.M.E.A.
___________________________________
Title

Rochester,
NH, USA
___________________________________
Location

Newbury,
Berkshire, England
___________________________________
Location

CONTENTS
CHAPTER 1 INTRODUCTION
1.1
1.2
1.4
1.5

ABOUT THIS MANUAL ........................................................................1-1
GETTING HELP.......................................................................................1-2
RELATED DOCUMENTATION ...........................................................1-4
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
2.2
2.3
2.4
2.5
2.6

ELS10-26 FRONT PANEL.......................................................................2-1
INSTALLING AN FEPIM .......................................................................2-4
INSTALLING THE ELS10-26 .................................................................2-5
CHECKING THE POWER-UP DIAGNOSTICS SEQUENCE ...........2-8
CONNECTING THE LOCAL CONSOLE MANAGER .....................2-9
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
3.11
3.12
3.13

DISPLAYING MONITORING STATUS...........................................3-12
DEFINING AND DELETING WORKGROUPS ..............................3-14
ASSIGNING A COMMUNITY NAME.............................................3-16
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

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
A.2
A.3
A.4
A.5
A.6
A.7

ELS10-26 SPECIFICATIONS ...............................................................A-1
Serial Cable Pin Assignments .............................................................A-3
10BASE-T Pin Assignments .................................................................A-4
Straight-through Wiring ......................................................................A-5
Crossover Wiring .................................................................................. A-6
The 5 - 4 - 3 Rule ....................................................................................A-6
FEPIM Specifications ............................................................................A-7

APPENDIX B GLOSSARY

vii

Contents

viii

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 to
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).

1-1

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)
anonymous
your email address

1-2

BBS:

(603) 335-3358

Modem setting:

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

Introduction

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

1-3

Introduction

and an IP address to execute the ipaddr
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:
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.

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
Wesley © 1992.
• 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.
1-4

Introduction

1.5 OVERVIEW
The SmartSTACK 10 ELS10-26TX is an intelligent Ethernet-toEthernet 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.
.

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ELS10-26TX Front Panel

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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.

1-5

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-andplay 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-ofband 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
1-6

Introduction

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.

Application

Presentation

Session

Transport

Network

Data Link

Physical

ELS10-26 operates at Layer 2

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
1-7

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.

ELS10-26
FastNet
10
LAN 1

LAN 2

Figure 1-3. Typical Switching Application

1-8

Introduction

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.
1-9

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.

1-10

Introduction

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 SystemTM to
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.

1-11

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.

LAN segments

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

FDX MON

100 USR

10 Mbps

STATUS

TX ACT

RX COL

LINK

PORT STATUS MODE

LINK

ELS10-26TX

STATUS

10 Mbps

MON

27
FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

10X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

ELS10-26

Up to 80 Mbps
Bandwidth

Trunk Lines

MON

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

100 USR

STATUS

FDX MON

RX COL

LINK

TX ACT

LINK

PORT STATUS MODE

STATUS

ELS10-26
ELS10-26TX

FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

27
2X

10 Mbps

10X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

10 Mbps
LAN segments

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

1-12

Introduction

Figure 1-5 illustrates how the SmartSTACK 10 ELS10-26 can be
used in a backbone network configuration.
Servers

Network
Management
Station

ELS10-26

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

100 USR

LINK

FDX MON

RX COL

STATUS

TX ACT

LINK

PORT STATUS MODE

LINK

ELS10-26TX

STATUS

10BASE-T Cables

Network Switch

MON

27
FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

10X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

Trunk Lines

ELS10-26

MON

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

100 USR

STATUS

FDX MON

RX COL

LINK

TX ACT

LINK

PORT STATUS MODE

STATUS

WAN Router

ELS10-26TX

FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

27
2X

10X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

10BASE-T Cables

Workgroup
Hub

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.

1-13

Introduction

Figure 1-6 illustrates connecting two SmartSTACK 10 ELS10-26
Fast Ethernet ports to increase the bandwidth to 200 Mbps.

LAN segment

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

100 USR

LINK

RX COL

STATUS

FDX MON

LINK

TX ACT

LINK

PORT STATUS MODE

STATUS

ELS10-26
ELS10-26TX

MON

27
FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

10X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

Front Panel

200 Mbps bandwidth
(Fast Ethernet, Full Duplex)

MON

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

100 USR

LINK

FDX MON

RX COL

STATUS

TX ACT

LINK

PORT STATUS MODE

LINK

ELS10-26TX

STATUS

ELS10-26
26
27

FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

27
2X

10X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

Front Panel
LAN segment

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

1-14

Introduction

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.

Network
Management
Station

Servers

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

ELS10-26

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

100 USR

LINK

FDX MON

RX COL

STATUS

TX ACT

LINK

PORT STATUS MODE

LINK

ELS10-26TX

STATUS

10BASE-T Cables

Network Switch

MON

27
FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

10X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

100 Mbps (Fast Ethernet)
ELS10-26

MON

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

100 USR

STATUS

FDX MON

RX COL

LINK

TX ACT

LINK

PORT STATUS MODE

STATUS

WAN Router
ELS10-26TX

FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

27
2X

10X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

10BASE-T Cables

Workgroup
Hub

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.
1-15

Introduction

Figure 1-8 shows two Ethernet segments, A and B, that do not
include a SmartSTACK 10 ELS10-26.

Repeater

Traffic

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.

1-16

Introduction

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.
Router

STATUS

MON

STATUS

LINK

STATUS

LINK

STATUS

ELS10-26
LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

100 USR

LINK

RX COL

STATUS

FDX MON

LINK

TX ACT

LINK

PORT STATUS MODE

STATUS

A
ELS10-26TX

FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

27
2X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

Workgroup A

10X

Workgroup B

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.

1-17

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 nonintelligent 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.

1-18

Introduction

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 [PORTNUMBER] [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

1-19

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.

1-20

Introduction

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]
pkts take to host
traplog

to print the route

to display the most recent SNMP traps

1-21

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>

1-22

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.

2-1

Unpacking and Installing Your ELS10-26

100BASE Ethernet Port
Reset Switch

STATUS

LINK

MON

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

100 USR

STATUS

FDX MON

RX COL

LINK

TX ACT

LINK

PORT STATUS MODE

STATUS

ELS10-26TX

Status LEDs

FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

27
2X

10X

Status Button
Com Port

12X

14X

16X

18X

20X

22X

24X

MONX

Monitor Port
100BASE Ethernet FEPIM Port

RJ45 Ethernet 10BASE-T Ports

Figure 2-1. ELS10-26 Front Panel

2-2

26X

Unpacking and Installing Your ELS10-26

Table 2-1. Meaning of ELS10-26 LEDs
LED

Meaning

Port Status Mode
TX

On – Indicates port is transmitting a packet.

On – Indicates port is receiving a packet.

ACT

On – Indicates port is transmitting or receiving.

COL

On – Indicates a collision on a port.

FDX

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.

100
MON
USR

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.

2-3

Unpacking and Installing Your ELS10-26

Table 2-2 describes the ELS10-26 buttons.
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.

2.2 INSTALLING AN FEPIM
Only qualified personnel should perform installation
procedures.

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.

2-4

Unpacking and Installing Your ELS10-26

Module
Module
Connector

Standoff
FE-1

00T

10
100

Motherboard
Connector

Standoffs

1742-39

Faceplate

Figure 2-2. Installing an FEPIM

2-5

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 rackmounted 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.

2-6

Unpacking and Installing Your ELS10-26

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.

MON

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

100 USR

LINK

FDX MON

RX COL

STATUS

TX ACT

LINK

PORT STATUS MODE

LINK

ELS10-26TX

STATUS

Rackmount
Brackets (2)

FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

10X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

Screws (4)

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.

MON

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

100 USR

LINK

FDX MON

RX COL

LINK

TX ACT

LINK

PORT STATUS MODE

LINK

ELS10-26TX

STATUS

19-Inch Rack

FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

27
2X

10X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

Screws (4)
Figure 2-4. Rack-mounting the ELS10-26

2-7

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.
2-8

Unpacking and Installing Your ELS10-26

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 outof-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.

2-9

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.
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).
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.

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

MON

LINK

MON
TX ACT FDX

STATUS

1
2

MODE
LINK

PORT STATUS

ELS10-26TX

STATUS

FEPIM
10BASE-T/
100BASE-TX

USR
RX COL 100

27
26X

STATUS
PWR
CPU

RESET

10X

12X

14X

16X

18X

20X

22X

24X

MONX

COM

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:

2-10

Unpacking and Installing Your ELS10-26

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.

TO
ELS10-26 RJ-45 Port

Note: RX+/RX- and
TX+/TX- must share a
common color pair.

TO
10Base-T Device Port

TX+ 1
TX- 2

1 TX+
2 TX-

RX+ 3
RX- 6

3 RX+
6 RX-

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
2-11

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.

Position X
(crossed over)

Position =
(not crossed over)
1. TX+
2. TX3. RX+
4. NC

5. NC
6. RX7. NC
8. NC

10
100
FE-100TX

1. RX+
2. RX3. TX+
4. NC

5. NC
6. TX7. NC
8. NC
166505

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.
2-12

Unpacking and Installing Your ELS10-26

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.
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.

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.

2-13

Unpacking and Installing Your ELS10-26

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.
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.

FX
FE-100
16

RX LED

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.

2-14

Unpacking and Installing Your ELS10-26

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.

2-15

Unpacking and Installing Your ELS10-26

2-16

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 nonintelligent 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.

3-1

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
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.

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.

3-2

Configuring Your ELS10-26

• 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 128191. 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
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.

3-3

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:

Port
1
2
3
4
5
6
7
8

IP Address

Address Mask

MAC Address

192.138.217.1
0.0.0.0
192.138.217.10
0.0.0.0
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
255.0.0.0
255.255.255.0
255.255.255.0
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

3.1.2 Deleting an IP Address
To delete an IP address, at the LCM prompt:
1. Type ipaddr 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.)

3-4

Configuring Your ELS10-26

To change the subnet mask, at the LCM prompt:
1. Type ipaddr
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.
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.

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: Selecting the noBPDU option could make your network inoperable
because the ELS10-26 would be unable to detect loops.

3-5

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:
Port 2 bridging: Transparent Bridging

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:
Port 2 bridging: off

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.

3-6

Configuring Your ELS10-26

Usage:
Port
Port
Port
Port

bridge [PORT-RANGE [{off|on|noBPDU{]]
1 bridging: Transparent Bridging
2 bridging: Transparent Bridging
3 bridging: Transparent Bridging
4 bridging: Transparent Bridging
.
.
.
Port 27 bridging: off

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.

3-7

Configuring Your ELS10-26

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

100 USR

LINK

FDX MON

RX COL

LINK

TX ACT

STATUS

PORT STATUS MODE

LINK

ELS10-26TX

STATUS

ELS10-26

MON

27
FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

10X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

10BASE-T Crossover Cables
(providing 80 Mbps of bandwidth)

MON

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

100 USR

STATUS

FDX MON

RX COL

LINK

TX ACT

LINK

PORT STATUS MODE

STATUS

ELS10-26TX

ELS10-26

26
27
FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

27
2X

10X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

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.

3-8

Configuring Your ELS10-26

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

100 USR

LINK

FDX MON

RX COL

LINK

TX ACT

STATUS

PORT STATUS MODE

LINK

ELS10-26TX

STATUS

ELS10-26 A

MON

27
FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

10X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

Trunk Group #1

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

100 USR

LINK

FDX MON

RX COL

STATUS

TX ACT

LINK

PORT STATUS MODE

LINK

ELS10-26TX

STATUS

ELS10-26 B

MON

27
FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

10X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

Trunk Group #2

MON

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

100 USR

LINK

FDX MON

RX COL

STATUS

TX ACT

LINK

PORT STATUS MODE

LINK

ELS10-26TX

STATUS

ELS10-26 C

26
27
FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

27
2X

10X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

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

3-9

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 firstin, first-out ordering of the Ethernet packets.
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.

3.6 DISABLING TRUNKING
To turn off trunking, at the LCM prompt:
1. Type trunk off
For example, trunk 2-4 off

3-10

Configuring Your ELS10-26

3.7 DISPLAYING TRUNKING STATUS
To check the status of your current trunking configuration, at the
LCM prompt:
1. Type trunk
The display could look like the following:
Note: IP Addresses are not required for trunking to function.
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

To check the status for ports configured for trunking, at the LCM
prompt:
1. Type status

3-11

Configuring Your ELS10-26

The display could look like the following:

ELS10-26 > status 1
Port 1 Status
Type/Speed:
Port Mirroring:
Duplex Mode:
Bridging:
Enabled/Disabled:
Spanning Tree:
Trunking State:
Pkts Transmitted:
Pkts Received:
Carrier Losses:
Total Collisions:
Excess Collisions:
RX Missed pkts:
RX Runt pkts:
RX FCS/Align Errs:
Internal TX Errs:

10B-TPX/10Mbits
No
Half Duplex
Transparent Bridging
Enabled, Rip listening
Forwarding
Off
1693
0
1693
0
0
0
0
0
0

Type to display port 2 status...>

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.

3-12

Configuring Your ELS10-26

• 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.

3-13

Configuring Your ELS10-26

3.9 DISABLING MONITORING
To turn off monitoring, at the LCM prompt:
1. Type Mirror 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
The display could look like the following:
ELS10-26> mirror 2
Port Mirroring: Port 2 is mirroring Tx traffic

To check the status for ports configured for monitoring:
1. Type status

3-14

Configuring Your ELS10-26

The display could look like the following:

10B-TPX/10Mbits
No
Half Duplex
Transparent Bridging
Enabled, Rip listening
Forwarding
Off
1693
0
1693
0
0
0
0
0
0

Type to display port 2 status...>

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.

3-15

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.

Router

MON

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

100 USR

STATUS

FDX MON

RX COL

LINK

TX ACT

LINK

PORT STATUS MODE

STATUS

ELS10-26
ELS10-26TX

FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

27
2X

12X

14X

16X

18X

20X

22X

24X

MONX

26X

Workgroup A

10X

Workgroup B

Figure 3-3. Defining Virtual Workgroups

3-16

Configuring Your ELS10-26

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

3-17

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.

3-18

Configuring Your ELS10-26

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.
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.
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:

3-19

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))

3-20

Configuring Your ELS10-26

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 ELS1026.
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.

3-21

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.

3-22

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 outof-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 SNMPbased 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.

4-1

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.

4-2

Monitoring and Managing Your ELS10-26

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

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.
Note: All statistics counters are cleared when the ELS10-26 is reset or
when the LCM clearstat command is used.
• 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.

4-3

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.
Note: You can also use the status command to display status for
individual Ethernet ports by typing status and specifying a port
number.
At the LCM prompt:
1. Type status
LCM displays the following type of information.

4-4

Monitoring and Managing Your ELS10-26

Software Currently Running: version xx.xx.xx software, Tue 08/23/94 15:03
Next Bootstrap (1st bank): version xx.xx.xx software Tue 08/23/94 15:03:0
Power-up test failures: none
System Up Time: 2:25:57
Current Number of Learned Addresses: 133
CPU utilization is light.

Port
1
2
3
4
.
.
.
24

RX Packets
0
6978
0
0
.
.
.
0

TX Packets

Collisions

1676
8
0
0
.
.
.
0

0
0
0
0
.
.
.
0

Erred Packets
1676
0
0
0
.
.
.
0

Type to display port 1 status...>

If you do not want to view the status of each Ethernet port, use
the Ctrl-C keys to return to the LCM prompt.
ELS10-26 > status 1
Port 1 Status
Type/Speed:
Port Mirroring:
Duplex Mode:
Bridging:
Enabled/Disabled:
Spanning Tree:
Trunking State:
Pkts Transmitted:
Pkts Received:
Carrier Losses:
Total Collisions:
Excess Collisions:
RX Missed pkts:
RX Runt pkts:
RX FCS/Align Errs:
Internal TX Errs:

10B-TPX/10Mbits
No
Half Duplex
Transparent Bridging
Enabled, Rip listening
Forwarding
Off
1693
0
1693
0
0
0
0
0
0

Type to display port 2 status...>

4-5

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.

4-6

Monitoring and Managing Your ELS10-26

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.
Address
Type
Port
08:00:20:02:3a:44 Learned
3

Age(secs)
26

Frames-From
1

Frames-To
0

Enter to continue, Ctrl-C to exit:

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
For example, if you typed, addresses display
LCM would display the following
information:

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

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

Type
Learned

Port
5

Age(secs)

Frames-From

1181

Frames-To
73

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
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

4-7

Monitoring and Managing Your ELS10-26

LCM would display:
Address
02:04:06:03:2a:43
02:04:06:00:2a:67
02:04:06:a3:70:2b

Type
Learned
Learned
Learned

Port
5
4
6

Age(secs)
21
1
0
Enter to continue, Ctrl-C to exit:

Frames-From
1181
3421
15339

Frames-To
73
0
235

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.
Port
1
2
3
4
5
6
7
8

IP Address

Address Mask

192.138.217.1
0.0.0.0
192.138.217.10
0.0.0.0
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
255.0.0.0
255.255.255.0
255.255.255.0
255.255.255.0

MAC Address
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

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:
Part Number: 501-3000-002
X70002e4-0006891
Up-Link Module Part Number: 123-4567-891 X1234567-1234567
Power-up test codes: 00000000 00000000 00000000 00000000
Diagnostic data: 00000000 00000000 fffffffc fffffffc
00000000 ff006000

4-8

Monitoring and Managing Your ELS10-26

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.

4-9

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
For example, disable 7-9 would disable ports 7, 8, and 9.
LCM responds:
Port 7: Disabled
Port 8: Disabled
Port 9: Disabled

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.
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.

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

4-10

Monitoring and Managing Your ELS10-26

For example, enable 7-9 would enable ports 7, 8, and 9.
LCM responds:
Port 7: Enabled, Rip listening
Port 8: Enabled, Rip listening
Port 9: Enabled, Rip listening

Note: Rip listening means that the ELS10-26 is in listening mode
only. No RIP packets are created.

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

4-11

Monitoring and Managing Your ELS10-26

LCM displays the current IP address table, for example:
Port IP Address
1
2
3
4
5
6
7

192.138.217.1
0.0.0.0
192.138.217.10
0.0.0.0
0.0.0.0
192.138.217.20
192.138.217.50

Address Mask

MAC Address

255.255.255.0
255.0.0.0
255.255.255.0
255.0.0.0
255.0.0.0
255.255.255.0
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

To change the subnet mask, at the LCM prompt:
1. Type ipaddr
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.
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.
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.
4-12

Monitoring and Managing Your ELS10-26

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.
Note: Make sure that the baud rate you set matches the baud rate setting
for the terminal you are using.
To display the current baud rate setting, at the LCM prompt:
1. Type baud
LCM responds:
Usage: baud [1200|2400|4800|9600|19200]
Baud rate is 4800.

4-13

Monitoring and Managing Your ELS10-26

To change the baud rate setting, at the LCM prompt:
1. Type baud
For example, baud 9600 would set the baud rate to 9600.
LCM responds:
Baud rate is 9600.

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
For example, reboot 60
LCM responds:
Reboot pending in 59 seconds.

4-14

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. Builtin 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.

5-1

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.
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.

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 nonvolatile memory.

5-2

ELS10-26 Diagnostics and Troubleshooting

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.
Note: A backup version of the operational parameters is always stored in
non-volatile memory before any update is attempted.

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.

5-3

ELS10-26 Diagnostics and Troubleshooting

STATUS

LINK

MON

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

LINK

STATUS

100 USR

LINK

FDX MON

RX COL

STATUS

TX ACT

LINK

PORT STATUS MODE

LINK

ELS10-26TX

STATUS

Segment Status LEDs

FEPIM
10BASE-T/
100BASE-TX

STATUS
PWR
CPU

RESET

COM

27
2X

10X

12X

14X

16X

18X

20X

22X

24X

MONX

Power and
CPU LEDs
Port Link LEDs
(upper row)

Port Status LEDs
(lower row)

Segment Status Option Select Button

Figure 5-1. ELS10-26 Front Panel LEDs

5-4

26X

ELS10-26 Diagnostics and Troubleshooting

Table 5-1. Meaning of ELS10-26 LEDs

LED
Port Status
Mode
TX
RX
ACT
COL
FDX
100

MON
USR

Meaning

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 describes the ELS10-26 buttons.
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.

5-5

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.

5-6

ELS10-26 Diagnostics and Troubleshooting

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.

5-7

ELS10-26 Diagnostics and Troubleshooting

5-8

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-1

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
A-2

Technical Specifications

• 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-3

Technical Specifications

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
Table A-2. DB9 Pin Assignments

ELS10-26 RJ45 (female)

DB9 pin (female)

Pin 1 (Rx)

Pin 2

Pin 4 (Tx)

Pin 3

Pin 5 (GND)

Pin 5

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.

8
1

Figure A-1. Connector Pin Numbers

A-4

Technical Specifications

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

Assignmenta

Pin
1

Rx+

Rx-

Tx+

Txa. 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-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-5

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.
Table A-5. Crossover RJ45 Pin Assignments

ELS10-26

1 (Rx+)

3 (Tx+)

2 (Rx-)

6 (Tx-)

3 (Tx+)

1 (Rx+)

6 (Tx-)

2 (Rx-)

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.
Note: This rule is completely consistent with the IEEE 802.3
specification, and is meant only to summarize the configuration
specification.

A-6

Technical Specifications

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.
Position X
(crossed over)

Position =
(not crossed over)
1. TX+
2. TX3. RX+
4. NC

5. NC
6. RX7. NC
8. NC

10
100
FE-100TX

1. RX+
2. RX3. TX+
4. NC

5. NC
6. TX7. NC
8. NC

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.

A-7

Technical Specifications

SP FE-100FX

Figure A-3. FE-100FX

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

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.

A-8

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-1

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.

B-2

Glossary

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-3

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.

B-4

Glossary

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-5

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.

B-6

Glossary

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-7

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.

B-8

Glossary

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-9

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.

B-10

Glossary

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-11

Glossary

B-12

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

bridging functions
disabling 3-6
displaying 3-6
enabling 3-6
bridging technologies A-2

C
A
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

B
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

certification A-3
changing
subnet mask 3-5, 4-12
checksum comparison test 5-2
community name, assigning 318, 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

D
deleting
IP addresses 3-4
Description 2-4
diagnostics
checksum comparison 5-2
overview 5-1
power-up 2-8, 5-1

I-1

Index
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

E
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

F
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

I-2

I
IP addresses
assigning 3-3
deleting 3-4
displaying 3-4, 4-8, 4-11
IP subnet mask,
changing 3-5, 4-12

L
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

M
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
multicast storm protection
defined 3-19
MIB variables 3-19

N
Network connection
FE-100FX 2-13
FX-100TX 2-11
non-volatile memory 5-3
noRIP option 4-11

O
or 1-22
OSI Reference Model 1-7

P
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

R
rack-mount installation 2-7
Ready LED 2-3
reboot 4-14
Reset button 2-4, 5-5
Routing Information Protocol
(RIP) 4-11

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

T
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

Segment Status LED 2-3, 5-5
Select button 2-4, 5-5
serial cable

I-3

Index

W
wiring
crossover A-6
straight-through A-5

I-4

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Modify Date                     : 1997:09:19 08:57:03
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Cabletron Systems Els10 26Tx Users Manual

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

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