Cabletron Systems SmartSTACK ELS100-24TXG User manual

SmartSTACK 100
ELS100-24TXG
ETHERNET SWITCH
INSTALLATION
AND
USER GUIDE

NOTICE
Cabletron Systems reserves the right to make changes in specifications and other informa-
tion 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, INDI-
RECT, SPECIAL, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING BUT
NOTLIMITEDTOLOSTPROFITS)ARISINGOUTOFORRELATEDTOTHISMANUALOR
THE INFORMATION CONTAINED IN IT, EVEN IF CABLETRON SYSTEMS HAS BEEN AD-
VISED OF, KNOWN, OR SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH DAMAG-
ES.
© Copyright 1999 by Cabletron Systems, Inc., P.O. Box 5005, Rochester, NH 03866-5005
All Rights Reserved
Printed in the United States of America
Part Number: 9032947 January 1999
ELS100-24TX is a trademark of Cabletron Systems, Inc.
All other product names mentioned in this manual may be trademarks or registered trade-
marks 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 ac-
cept any interference received, including interference that may cause undesired operation.
NOTE:This equipment hasbeen tested and found to complywith thelimits for aClass A dig-
ital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide rea-
sonable 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 in-
terference to radio communications. Operation ofthis equipment in a residentialarea is likely
to causeinterference in which case the user will be required to correct the interference at his
own expense.
WARNING: Changesor modificationsmade to thisdevice whichare notexpressly approved
by the party responsible for compliance could void the user’s authority to operate the equip-
ment.
Printed on Recycled Paper
Only qualified personnel should perform installation
procedures.

DOC NOTICE
This digital apparatus does not exceed the Class A limits for radio noise emissions from dig-
ital 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 Interfer-
ence 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 re-
quired 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 yourrights and obligations with respect to the Cabletron software
program (the “Program”) contained in this package. The Program may be contained in firm-
ware, chips or other media. BY UTILIZING THE ENCLOSED PRODUCT, YOU ARE AGREE-
ING 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.
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 per-
mitted by the Copyright Act of the United States or as authorized in writing by
Cabletron.
2. OTHER RESTRICTIONS. Youmay not reverse engineer,decompile, ordisassem-
ble the Program.
3. APPLICABLE LAW. This License Agreement shall be interpreted and governed
under the laws and in the state and federal courts of New Hampshire. You accept
the personal jurisdiction and venue of the New Hampshire courts.

EXCLUSION OF WARRANTY
AND DISCLAIMER OF LIABILITY
1. EXCLUSION OF WARRANTY. Except as may be specifically provided by Cabletron in
writing, Cabletron makes no warranty, expressed or implied, concerning the Pro-
gram (including its documentation and media).
CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUP-
PLIED TO YOU BY CABLETRON IN WRITING, EITHER EXPRESSED OR IM-
PLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH RE-
SPECT TO THE PROGRAM, THE ACCOMPANYING WRITTEN MATERIALS,
AND ANY ACCOMPANYING HARDWARE.
2. NO LIABILITY FOR CONSEQUENTIAL DAMAGES. IN NO EVENT SHALL
CABLETRON OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSO-
EVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSI-
NESS, 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 AD-
VISED OF THE POSSIBILITY OF SUCH DAMAGES. BECAUSE SOME STATES
DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CON-
SEQUENTIAL OR INCIDENTAL DAMAGES, OR ON THE DURATION OR LIMI-
TATION 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 succes-
sors, 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 re-
strictions as set forth insubparagraph(c) (1)(ii)ofthe Rightsin TechnicalData and Computer
Software clause at 252.227-7013. Cabletron Systems, Inc., 35 Industrial Way, Rochester,
New Hampshire 03867-0505.
SAFETY INFORMATION
LASER RADIATION AND CONNECTORS
When the connector is in place, all laser radiation remains within the fiber. The maximum
amount of radiant power exiting the fiber (under normal conditions) is -12.6 dBm or 55 x 10 -
6watts. Removing the optical connector from the transceiver allows laser radiation to emit
directly from the optical port. The maximum radiance from the optical port (under worst case
conditions) is 0.8 W cm -2 or 8 x 10 3 W m 2 sr-1.
Do notuse opticalinstruments to view the laser output. The use of optical instruments to view
laser output increases eye hazard. When viewing the output optical port, power must be re-
moved from the network adapter.

DECLARATION OF CONFORMITY
Application of Council Directive(s): 89/336/EEC
73/23/EEC
Manufacturer’s Name: Cabletron Systems, Inc.
Manufacturer’s Address: 35 Industrial Way
PO Box 5005
Rochester, NH 03867
European Representative Name: Mr. J. Solari
European Representative Address: Cabletron Systems Limited
Nexus House, Newbury Business Park
London Road, Newbury
Berkshire RG13 2PZ, England
Conformance to Directive(s)/
Product Standards: EC Directive 89/336/EEC
EC Directive 73/23/EEC
EN 55022
EN 50082-1
EN 60950
Equipment Type/Environment: Networking Equipment, for use in a Com-
mercial or Light Industrial Environment.
We the undersigned, hereby declare, under our sole responsibility, that the equip-
ment packaged with this notice conforms to the above directives.
Manufacturer Legal Representative in Europe
Mr. Ronald Fotino Mr. J. Solari
Full Name Full Name
Principal Compliance Engineer Managing Director - E.M.E.A.
Title Title
Rochester, NH, USA Newbury, Berkshire, England
Location Location

9032947 Table Of Contents i
TABLE OF CONTENTS
PREFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .v
Purpose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Audience. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Message Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Keyboard Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Other Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vi
Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vi
1. PRODUCT OVERVIEW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Feature Summaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
IEEE 802.1D Bridge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Spanning Tree Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Frame Buffering and Frame Latency. . . . . . . . . . . . . . . . . . . . . . . .6
Software Download . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Non-volatile Parameter Storage . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Configuration and Management Interfaces . . . . . . . . . . . . . . . . . . .7
RMON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Port Mirroring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Auto-negotiation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Broadcast Throttling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
BootP/DHCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Full Duplex Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Flow Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Virtual LANs (VLANs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Class of Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Application Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Client/Server Network Application. . . . . . . . . . . . . . . . . . . . . . . . .11
Local Backbone Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
2. INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Inspecting Your Shipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Site Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Mounting the Switch on a Table or Shelf . . . . . . . . . . . . . . . . . . . . . . .14
Mounting the Switch on a Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Mounting the Switch in a Rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Connecting a Terminal to the Console Port . . . . . . . . . . . . . . . . . . . . .17
Powering the Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Power-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

ii Table Of Contents ELS100-24TXG
Network Cable Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Copper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Fiber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
10Base-T/100Base-TX Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1000Base-X Gigabit Ethernet Ports. . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3. ELS100-24TXG USER INTERFACE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
User Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Factory Defaults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Menu Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
System Configuration Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
SNMP Configuration Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Switch Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Forwarding Table Configuration Menu. . . . . . . . . . . . . . . . . . . . . . . . . 31
Spanning Tree Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Spanning Tree Port Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . 35
Spanning Tree Port #n Configuration Menu. . . . . . . . . . . . . . . . . . . . . 36
VLAN Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
VLAN Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
VLAN #n Configuration Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
VLAN Port Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Class of Service Configuration Menu. . . . . . . . . . . . . . . . . . . . . . . . . . 41
Port Priority Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Port Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Port Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Switch Statistics Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Switch Summary Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Port Statistics Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
General Information Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Download Software Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Save Current Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Return to Default Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Logout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
4. CONFIGURING & MONITORING THE SWITCH . . . . . . . . . . . . . . . . . . . . . 53
Common Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Setting Password Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Assigning an IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Checking Network Configuration Status. . . . . . . . . . . . . . . . . . . . . . . . 55
Connecting via Telnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Setting SNMP Management Access . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Viewing Switch Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Configuring Port Mirroring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Downloading a Software Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Downloading Via the Serial Port . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Downloading Via TFTP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

9032947 Table Of Contents iii
Configuring Spanning Tree Parameters . . . . . . . . . . . . . . . . . . . . . . . .58
Configuring VLANs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Configuring Class of Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Configuring Port Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Configuring the Forwarding Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Configuring Broadcast Cutoff Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
Setting a Default Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
Configuring BootP/DHCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
5. SNMP MANAGEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
The SNMP Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
MIB Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
RFC 1213 (MIB-II) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
RFC 1398 (Ethernet MIB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
RFC 1493 (Bridge MIB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
RFC 1757 (RMON MIB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
Cabletron Proprietary MIB Extensions. . . . . . . . . . . . . . . . . . . . . .67
Compiling MIB Extensions: Cabletron Website. . . . . . . . . . . . . . . . . . .70
APPENDIX A. TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . .71
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
Standards Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
Data Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
Environmental Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
Electrical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
Port Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Console Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
10Base-T and 100Base-TX Ports . . . . . . . . . . . . . . . . . . . . . . . . .73
MDI/MDI-X Crossover Cable Wiring . . . . . . . . . . . . . . . . . . . . . . . 74
Power Cord Set Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
General Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
Country-Specific Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . .75
APPENDIX B. SPANNING TREE CONCEPTS. . . . . . . . . . . . . . . . . . . . . . . . .77
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Spanning Tree Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Spanning Tree Protocol in a Network. . . . . . . . . . . . . . . . . . . . . . . . . .78
Spanning Tree Protocol Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . .78
Spanning Tree Protocol Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Communicating Between Bridges . . . . . . . . . . . . . . . . . . . . . . . . .80
Selecting a Root Bridge and Designated Bridges . . . . . . . . . . . . .80
Selecting Designated Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Handling Duplicate Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Remapping Network Topology . . . . . . . . . . . . . . . . . . . . . . . . . . .80

iv Table Of Contents ELS100-24TXG
APPENDIX C. FLOW CONTROL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
APPENDIX D. VIRTUAL LANS (VLANS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
VLANs and Frame Tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
ELS100-24TXG VLAN Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . 84
VLAN ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Ports in VLAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
VLAN Egress Ports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
VLAN Access Ports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
VLAN Hybrid Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
VLAN Application Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
APPENDIX E. CLASS OF SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
APPENDIX F. ACRONYMS & ABBREVIATIONS . . . . . . . . . . . . . . . . . . . . . . 91
INDEX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

9032947 Preface v
PREFACE
Purpose
Thisguide provides information about the features and applicationsof the
Cabletron ELS100-24TXG switch as well as instructions for configuring
and monitoring the switch.
Audience
This guide is intended for Ethernet local area network (LAN)
administrators and Management Information Systems (MIS) personnel
with the following background:
•Working knowledge of Ethernet LANs
•Familiarity with Transmission Control Protocol/Internet Protocol
(TCP/IP) and Simple Network Management Protocol (SNMP)
Conventions
This section describes the conventions used in this guide.
Message Formats
Two types of messages, identified by icons, appear in the text:
Keyboard Entries
This guide uses the following conventions for keyboard entries:
•When you read “enter,” type the text and press the [Enter] key.
•Example: Enter the Gateway IP address and press the [Enter] key.
•When you read “select,” type the letter associated with the
parameter.
Example: Select afrom the System Configuration Menu to view the
SNMP Configuration Menu.
A note informs you of special circumstances.
A caution indicates the possibility of equipment damage.

vi Preface ELS100-24TXG
Other Conventions
This guide uses the following typographical conventions:
•Initial Caps Menu titles and console menu selections.
•[Enter] Used to designate the Enter or Return key.
•ALL CAPS Used to designate fields within the console menus
(Example: CONNECTION).
•courier font Screen messages and user prompts.
•Selection Describes a user-configurable user interface item.
•Field Describes a read-only information item.
Organization
Chapter 1. Product Overview:Describesthefeaturesof theswitch,front
and rear panel components and application examples.
Chapter 2. Installation: Describes the content of your switch shipment,
lists site requirements, and provides mounting instructions. Instructions
for making connections and powering up the switch are provided as well.
Chapter 3. ELS100-24TXG User Interface: Describes the user interface
console menus and lists the factory defaults for system settings. Each of
the console menus are presented along with a description of the
selections/fields available within each menu.
Chapter 4. Configuring and Monitoring the Switch: Describes
common tasks and associatedstepsrequired toconfigure the switch,and
covers common switch and network considerations required to ensure
system integrity.
Chapter 5. SNMP Management: Describes how the Simple Network
Management Protocol (SNMP) communication protocol is used to
manage the switch, and provides a description of industry standard and
proprietary Managed Information Bases (MIBs) supported by the switch.
Appendix A. Technical Specifications: Provides a list of standards
compliance and certifications as well as physical and operational
specifications.
Appendix B. Spanning Tree Concepts: Describes the operation of the
Spanning Tree Protocol and how it is used to resolve the problems of
physical loops in a network.
Appendix C. Flow Control: Describes how the flow control features are
used to provide a mechanism for protecting the switch from overload
conditions and to keep additional traffic off the network.
Appendix D. Virtual LANs (VLANs): Describes how the switch uses
VLANs to create isolated network domains, and provides illustrations of
VLAN switch configurations.

9032947 Preface vii
Appendix E. ClassofService:Describeshowthe trafficClassofService
features can be used to assign mission-critical data a higher priority
through the switch by delaying less critical traffic during periods of
congestion.
Appendix F. Acronyms and Abbreviations: Provides definitions for a
list of common acronyms and abbreviations used within the user guide
and the networking industry.

9032947 Product Overview 1
1. PRODUCT OVERVIEW
Description
This installation and user guide describes the Cabletron ELS100-24TXG
Ethernet switch. The switch is IEEE 802.1D-compliant and supports 24
IEEE802.3u 100Base-TXFastEthernetports.Eachportcanalternatively
operate as an IEEE 802.3i 10Base-T port. Additionally, the switch
features 2 Gigabit Ethernet ports which operate at 1 Gbps. These ports
support the various physical media transceiver flavors of IEEE 802.3z
Gigabit Ethernet through the use of modular Gigabit Interface Converters
(GBICs). Supported media includes multi-mode fiber, single mode fiber,
and twinax copper.
The Cabletron ELS100-24TXG switch automatically learns end-station
addresses from the network and stores them in a Media Access Control
(MAC) address forwarding table. Incoming packets are then forwarded to
the appropriate output port based on the addresses in the packet. Each
port on the switch operates at full wire speed with full address and frame
filtering.
The Cabletron ELS100-24TXG switch contains advanced features such
as Remote Monitoring (RMON), IEEE 802.1Q virtual LANs (VLANs),
IEEE 802.1p Class of Service, flow control and broadcast throttling. For
network management, the ELS100-24TXG switch includes a standards-
compliant Simple Network Management Protocol (SNMP) agent. This
agent allows network management station applications to collect and
present status and performance information about a switch as well as
providing the ability to configure and control functions on the device.
Network management can also be performed in-band using the popular
TCP/IP application, Telnet. In addition, a serial console port allows out-of-
band management using a PC or a terminal. The ELS100-24TXG switch
isdesktoporrack-mountable.LEDsonthefrontpanelprovideinformation
about the operating status of the switch. The back panel of the switch
contains the power connector and a power switch. Two fans maintain
ventilation and cooling for internal switch components.
This chapter provides the following information:
•Product Description
•Features
•Front and Rear Panel Component Descriptions
•Feature Summaries
•Application Examples

2 Product Overview ELS100-24TXG
Features
•Ports:
- 24 dual-speed 10Base-T/100Base-TX ports using RJ-45
connectors (MDI-X)
- 2 1000Base-X Gigabit Ethernet ports using modular GBIC
transceivers
•Architecture:
- 8-port 10/100 and 1-port Gigabit Ethernet switch ASICs in a
distributed switching architecture
- 4.2 Gbps internal switching fabric
- 12 MB packet buffering (512 KB/port) for 10/100 ports
- 16 MB packet buffering (8 MB/port) for Gigabit Ethernet ports
- 4096 MAC address forwarding table per port; up to 16,384
addresses per system
- IEEE 802.3u auto-negotiation for full/half duplex and 10/100
Mbps speed operation on all RJ-45 10/100 ports
- High performance store-and-forward switching
•Performance:
- Forwarding: over 6 million packets-per-second (64 byte
packets)
- Filtering: 6.5 million packets-per-second (64 byte packets)
•Traffic Management:
- Tag and port-based VLANs per the IEEE 802.1Q draft
standard - 4094 VLAN IDs recognized per switch
- Class of Service support per the IEEE 802.1p draft standard
- Flowcontrolperport:IEEE802.3x frame-basedforfullduplex;
back-pressure for half duplex
- Broadcast throttling for broadcast storm control
•Network Management:
- SNMP compliant agent: MIB II (RFC 1213); Bridge MIB (RFC
1493); Ethernet MIB (RFC 1398); RMON - Statistics, History,
Alarm and Event groups per port (RFC 1757); private MIB
extensions
- Port mirroring for network monitoring and analysis
- Telnet
- Console port, RS-232, female DB-9 connector, null modem
- BootP/DHCP for IP address configuration
•LED Indicators
- 10Base-T/100Base-TXEthernet ports: Link,Activity, 100Mbps
Speed, Full Duplex
- 1000Base-X Gigabit Ethernet ports: Link and Activity
- System: Power, Test

9032947 Product Overview 3
•Software:
- Extensive diagnostics for product testing and troubleshooting
- Upgrades using the front panel console port or in-band with
TFTP
Front Panel
Figure 1-1 showsthe front panelof the Cabletron ELS100-24TXG. Table
1-1 defines the ELS100-24TXG front panel components.
Figure 1-1. ELS100-24TXG Front Panel
Table 1-1. Front Panel Components
Name Function
Gigabit Ethernet ports 25
and 26 LEDs Indicates Link and Activity information (see Table 1-2 for details).
1000Base-X Gigabit
Ethernet ports Gigabit Ethernet ports using GBIC modules.
Ports 1-24 LEDs Indicates Link,Activity, Speed and Duplex information
(see Table 1-2 for details).
10Base-T/100Base-TX
RJ-45 ports Copper ports using RJ-45 port connectors. These ports are wired MDI-X.
LED mode button Button used to switch RJ-45 port LEDs between Link/
Activitymodeand 100M/FullDuplexmode.Thisbutton
has no affect on Gigabit Ethernet port LEDs.
Power LED Lights steady green toindicatepoweris supplied to the
switch. Off indicates no power is supplied to the switch.
Test LED Lights steady green after a reset and remains on until
successful completion of power-on self tests. Off indi-
cates a successful completion of the power-on self
tests.
Console port Female DB-9 connector configured as a null modem
connection for serial out-of-band management using
the console menus.

4 Product Overview ELS100-24TXG
Figure 1-2 shows the Link and Activity LEDs for the 2 1000Base-X
Gigabit Ethernet ports. The LEDs are positioned to the left of their
associated port.
Figure 1-2. 1000Base-X Gigabit Ethernet Port LEDs
Figure 1-3 shows the Link and Activity port LEDs for 24 10Base-T/
100Base-TX ports (default configuration).
Pressing the front panel LED mode button changes the operation of the
RJ-45 LEDs to show Speed and Full Duplex operation, as shown in
Figure 1-4.
Figure 1-3. Port LEDs Default Configuration
Figure 1-4. Port LEDs LED Mode Button Pressed
The numbers above and below the port LEDs identify the
LEDs associated with a specific RJ-45 port.
Link LEDs
Activity LEDs
Link 234
5678
1
Activity
Link
Activity
Link 10 11 12
13 14 15 16
9
Activity
Link
Activity
Link 18 19 20
21 22 23 24
17
Activity
Link
Activity
10/100 speed 234
5678
1
Full/half duplex
10/100 speed
Full/half duplex
10/100 speed 10 11 12
13 14 15 16
9
Full/half duplex
10/100 speed
Full/half duplex
10/100 speed 18 19 20
21 22 23 24
17
Full/half duplex
10/100 speed
Full/half duplex

9032947 Product Overview 5
The port LEDs are groupedto the left of their corresponding RJ-45 ports.
Table 1-2 defines the performance of the port LEDs for the 10Base-T/
100Base-TX ports in both the default configuration and with the LED
mode button pressed.
Table 1-2. Port LEDs Defined
Rear Panel
Figure 1-5 shows the ELS100-24TXG rear panel and Table 1-3 defines
the rear panel components.
Figure 1-5. ELS100-24TXG Rear Panel
Table 1-3. Rear Panel Components
Name Function
Gigabit
Ethernet Ports Link LED On: Indicates a valid connection (link) on the associatedport.
Link LED Off: Indicates no link on the associated port.
Activity LED flashing: Indicates the presence of transmit and/or re-
ceive activity.
Activity LED Off: Indicates the absence of transmit or receive activity.
RJ-45 Ports
Default
Configuration
Link LED On: Indicates a valid connection (link) on the associatedport.
Link LED Off: Indicates no link on the associated port.
Activity LED flashing: Indicates the presence of transmit and/or re-
ceive activity.
Activity LED Off: Indicates the absence of transmit or receive activity.
RJ-45 Ports
LED mode
button pressed
Speed LED On: Indicates the port is in the 100Base-TX mode.
Speed LED Off: Indicates the port is in the 10Base-T mode.
Duplex LED On: Indicates the port is in the full duplex mode.
Duplex LED Off: Indicates the port is in the half duplex mode.
Name Function
Power Connector Provides AC power to the switch.
Power Switch Allows you to turn the switch power on and off.
Fan Outlets Air exit vents through which internal fans discharge air
for ventilation purposes.

6 Product Overview ELS100-24TXG
Feature Summaries
The following summaries provide a brief description of ELS100-24TXG
features in areas such as standards compliance, functionality,
performance, and options.
IEEE 802.1D Bridge
The ELS100-24TXG switch is fully compliant with IEEE 802.1D
transparent bridging specifications. An aggregate address table,
containing 4096 entries per 8 10/100 ports and per Gigabit Ethernet port,
is provided for learning, filtering, and forwarding. The switch can support
up to a maximum of 16,384 addresses. Addresses are automatically
learned by the switch, and can be individually assigned specific
forwarding treatment by the network administrator if desired. Forwarding
table configuration can be made out-of-band via the console interface or
in-band via SNMP or Telnet. Static and dynamic addresses are both
storedinthistable.Onestaticaddressisassignedperportbydefault. The
Forwarding Table Configuration screen in the console menus allows you
to assign additional static addresses if required.
Spanning Tree Protocol
The ELS100-24TXG switch supports the IEEE 802.1D Spanning Tree
Protocol. This protocol allows redundant connections to be created
between different LAN segments for purposes of fault tolerance. Two or
more physical paths between different segments can be created through
the switch, with the Spanning Tree Protocol choosing a single path at any
given time and disabling allothers. If the chosen path fails for anyreason,
a disabled alternative is activated, thereby maintaining the connection.
Thispreventsnetworktraffic from circulating in anendlessloopformed by
multiple connections to the same LAN segment.
Spanning Tree parameters are configurable in the Spanning Tree
ConfigurationMenuusingthe consolemenusorviaSNMP(seeAppendix
B, “Spanning Tree Concepts,” for more information).
Frame Buffering and Frame Latency
TheELS100-24TXG switchisa store-and-forwardswitching device. Each
frame is copied into switch memory before being forwarded to another
port. This method ensures that all forwarded frames conform to a
standard Ethernet frame sizeand havea correct cyclic redundancy check
(CRC) for data integrity. This switching method prevents bad frames from
traversing thenetwork and using up valuable network bandwidth, as with
cut-through switching technology.
To minimize the possibility of dropping frames on congested ports, the
ELS100-24TXG switch provides 512 KB per 10/100 port and 8 MB per
Gigabit Ethernetport of dynamically allocated frame buffering. This buffer
space is used to queue packets for transmission on congested networks.
This is an additional advantage over cut-through switching technology,
which drops packets immediately when experiencing collisions.