Enterasys 2H252-25R Operation manual

2H252-25R
SmartSwitch 2200
Installation User’s Guide
2H252-25R COM
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CPU
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DPX-SPD
FAST ETHERNET WORKGROUP SW TCH
9034005-03

NOTICE
Enterasys Networks reserves the right to make changes in specifications and other information contained in this
document and its web site without prior notice. The reader should in all cases consult Enterasys Networks to determine
whether any such changes have been made.
The hardware, firmware, or software described in this document is subject to change without notice.
IN NO EVENT SHALL ENTERASYS NETWORKS BE LIABLE FOR ANY INCIDENTAL, INDIRECT, SPECIAL,
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Enterasys Networks, Inc.
35 Industrial Way
Rochester, NH 03867
2002 Enterasys Networks, Inc. All rights reserved.
Printed in the United States of America.
Order Number: 9034005-03 November 2002
LANVIEW is a registered trademark and Enterasys Networks, NETSIGHT, MATRIX, WEBVIEW, and any logos
associated therewith, are trademarks of Enterasys Networks, Inc. in the United States and other countries.
All other product names mentioned in this manual may be trademarks or registered trademarks of their respective
companies.
Only qualified personnel should perform installation procedures.

FCC NOTICE
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device
may not cause harmful interference, and (2) this device must accept any interference received, including interference that
may cause undesired operation.
NOTE: This equipment has been tested and found to comply with the limits for a class A digital device, pursuant to Part
15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment uses, generates, and can radiate radio frequency
energy and if not installed in accordance with the operator’s manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause interference in which case the user
will be required to correct the interference at his own expense.
WARNING: Changes or modifications made to this device which are not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.
INDUSTRY CANADA NOTICE
This digital apparatus does not exceed the class A limits for radio noise emissions from digital apparatus set out in the
Radio Interference Regulations of the Canadian Department of Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils
numériques de la class A prescrites dans le Règlement sur le brouillage radioélectrique édicté par le ministère des
Communications du Canada.
VCCI NOTICE
This is a class A product based on the standard of the Voluntary Control Council for Interference by Information
Technology Equipment (VCCI). If this equipment is used in a domestic environment, radio disturbance may arise. When
such trouble occurs, the user may be required to take corrective actions.
CLASS A ITE NOTICE
WARNING: This is a class A product. In a domestic environment this product may cause radio interference in which
case the user may be required to take adequate measures.

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DECLARATION OF CONFORMITY
Application of Council Directive(s): 89/336/EEC
73/23/EEC
Manufacturer’s Name: Enterasys Networks, Inc.
Manufacturer’s Address: 35 Industrial Way
PO Box 5005
Rochester, NH 03866-5005
European Representative Address: Enterasys Networks Ltd.
Nexus House, Newbury Business Park
London Road, Newbury
Berkshire RG14 2PZ, England
Conformance to Directive(s)/Product Standards: EC Directive 89/336/EEC
EC Directive 73/23/EEC
EN 55022
EN 55024
EN 60950
EN 60825
Equipment Type/Environment: Networking Equipment, for use in a Commercial
or Light Industrial Environment.
Enterasys Networks, Inc. declares that the equipment packaged with this notice conforms to the above directives.

Contents vii
Contents
Figures ............................................................................................................................................ix
Tables.............................................................................................................................................. x
ABOUT THIS GUIDE
Using This Guide.............................................................................................................xi
Structure of This Guide ...................................................................................................xi
Related Documents........................................................................................................xii
Document Conventions.................................................................................................xiii
1INTRODUCTION
1.1 Overview ......................................................................................................... 1-1
1.1.1 Connectivity ....................................................................................1-2
1.1.2 Runtime IP Address Discovery .......................................................1-2
1.1.3 Full Duplex Switched Ethernet........................................................ 1-3
1.1.4 SmartTrunk .....................................................................................1-3
1.1.5 Remote Monitoring (RMON) ...........................................................1-4
1.1.6 Broadcast Suppression...................................................................1-4
1.1.7 Port/VLAN Redirect Functions ........................................................1-4
1.1.8 Rate Limiting...................................................................................1-4
1.1.9 Flow Control....................................................................................1-5
1.1.10 GARP Switch Operation ................................................................. 1-5
1.1.11 802.1 Port Priority ...........................................................................1-6
1.1.12 Management ................................................................................... 1-6
1.1.13 Switching Options ........................................................................... 1-6
1.1.14 Optional HSIMs and VHSIMs.......................................................... 1-6
1.1.15 Standards Compatibility .................................................................. 1-7
1.1.16 Year 2000 Compliant ......................................................................1-7
1.1.17 LANVIEW Diagnostic LEDs ............................................................1-7
1.2 Getting Help ....................................................................................................1-8
2NETWORK REQUIREMENTS
2.1 SmartTrunk......................................................................................................2-1
2.2 10BASE-T Network.........................................................................................2-1
2.3 100BASE-TX Network.....................................................................................2-2

viii Contents
3INSTALLATION
3.1 Unpacking the Device ..................................................................................... 3-1
3.2 Installing Options............................................................................................. 3-2
3.3 Installing the Device ........................................................................................3-3
3.3.1 Tabletop or Shelf Installation ..........................................................3-3
3.3.2 Rackmount Installation....................................................................3-4
3.3.3 Connecting Power...........................................................................3-8
3.4 Connecting to the Network..............................................................................3-9
3.4.1 Connecting Twisted Pair Cables to Fixed Ports..............................3-9
3.5 Completing the Installation............................................................................ 3-12
4TROUBLESHOOTING
4.1 Using LANVIEW..............................................................................................4-1
4.2 Troubleshooting Checklist...............................................................................4-6
4.3 Using the RESET Button.................................................................................4-9
ASPECIFICATIONS
A.1 Device Specifications ......................................................................................A-1
A.2 Physical Properties .........................................................................................A-1
A.3 Electrical Specifications ..................................................................................A-2
A.4 Environmental Requirements..........................................................................A-2
A.5 Input/Output Ports...........................................................................................A-2
A.6 COM Port Pinout Assignments .......................................................................A-3
A.7 Regulatory Compliance...................................................................................A-3
BOPTIONAL INSTALLATIONS AND
MODE SWITCH BANK SETTINGS
B.1 Required Tools................................................................................................B-1
B.2 Removing the Chassis Cover..........................................................................B-2
B.3 Setting the Mode Switches..............................................................................B-5
B.4 SIMM Upgrade................................................................................................B-7
B.4.1 Locating SIMMs ..............................................................................B-7
B.4.2 Installing the DRAM SIMM..............................................................B-8
B.5 Installing Optional HSIM or VHSIM Interface Modules ...................................B-9
INDEX

Figures ix
Figure Page
Figures
1-1 The 2H252-25R SmartSwitch 2200.................................................................................1-1
3-1 Tabletop or Shelf Installation...........................................................................................3-4
3-2 Attaching the Strain-Relief Bracket .................................................................................3-6
3-3 Attaching the Rackmount Brackets .................................................................................3-7
3-4 Installing the Device in a Rack ........................................................................................3-7
3-5 2H252-25R Rear View ....................................................................................................3-8
3-6 Connecting the Twisted Pair Segment ..........................................................................3-10
3-7 Schematic of Straight-Through and Crossover Cables .................................................3-11
4-1 LANVIEW LEDs ..............................................................................................................4-2
4-2 RESET Button .................................................................................................................4-9
B-1 Removing the Chassis Cover......................................................................................... B-4
B-2 Mode Switch Location .................................................................................................... B-5
B-3 SIMM Slot Locations ...................................................................................................... B-7
B-4 Installing the DRAM........................................................................................................ B-8
B-5 HSIM and VHSIM Connector Locations ......................................................................... B-9

xTa bl e s
Table Page
Tables
3-1 Contents of 2H252-25R Carton ....................................................................................3-2
4-1 LANVIEW LEDs ............................................................................................................4-3
4-2 Troubleshooting Checklist.............................................................................................4-6
A-1 COM Port Pin Assignments ......................................................................................... A-3

About This Guide xi
About This Guide
Welcome to the 2H252-25R SmartSwitch 2200 Installation User’s Guide.This guide describes
the 2H252-25R SmartSwitch 2200 device and provides information concerning network
requirements, installation, troubleshooting, and specifications.
USING THIS GUIDE
Read through this guide to completely understand the 2H252-25R capabilities and for the
instructions on how to install and troubleshoot the device. For information about how to use Local
Management to configure and manage the 2H252-25R, refer to the Enterasys Networks
SmartSwitch Series 2E253, 2H252, 2H253, and 2H258 Local Management User’s Guide.
A general working knowledge of Ethernet and IEEE 802.3 type data communications networks
and their physical layer components is helpful when using this device. In this document, the device
is referred to as either the “2H252-25R” or the “device”.
STRUCTURE OF THIS GUIDE
This guide is organized as follows:
Chapter 1,Introduction, provides an overview of the 2H252-25R and its features. Directions for
obtaining additional information or help from Enterasys Networks are also included in this
chapter.
Chapter 2, Network Requirements, explains the network requirements to consider before
installing the 2H252-25R.
Chapter 3, Installation, provides instructions on how to install and connect segments to the
2H252-25R.
Chapter 4,Troubleshooting, describes the function of the LANVIEW LEDs, which can help to
quickly diagnose network/operational problems.
Important Notice
Depending on the firmware version used in the 2H252-25R, some features described in this
document may not be supported. Refer to the Release Notes shipped with the 2H252-25R to
determine which features are supported.

Related Documents
xii About This Guide
Appendix A, Specifications, contains information on functionality and operating specifications,
connector pinouts, environmental requirements, and physical properties.
Appendix B, Optional Installations and Mode Switch Bank Settings, describes how to remove
the cover from the device, set the Mode Switch, and shows the location of an optional High Speed
Interface Module (HSIM) or Very High Speed Interface Module (VHSIM) when one is installed.
RELATED DOCUMENTS
The following Enterasys Networks documents may help to set up and manage the 2H252-25R:
•SmartSwitch Series 2E253, 2H252, 2H253, and 2H258 Local Management User’s Guide
•Ethernet Technology Guide
•Cabling Guide
•SmartTrunk User’s Guide
The following Enterasys Networks documents are associated with optional interface modules:
•HSIM-A6DP User’s Guide
•HSIM-F6 User’s Guide
•HSIM-FE6 User’s Guide
•HSIM-W6 Installation Guide
•HSIM-W84 Installation Guide
•WAN Series Local Management User’s Guide
•HSIM-W87 User’s Guide
•HSIM-G01/G09 User’s Guide
•VHSIM-G6 User’s Guide
•VHSIM-A6DP User’s Guide
The HSIM-W6 Installation Guide, the HSIM-W84 Installation Guide, and the WAN Series Local
Management User’s Guide are included on the QuickSET CD-ROM and, along with the other
manuals listed above, can be obtained from the World Wide Web in Adobe Acrobat Portable
Document Format (PDF) at the following site:
http://www.enterasys.com
NOTE: All documentation for the Enterasys Networks SecureFast VLAN Manager
software is contained on the VLAN Manager CD-ROM.

Document Conventions
About This Guide xiii
DOCUMENT CONVENTIONS
The guide uses the following conventions:
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.
ELECTRICAL HAZARD: Warns against an action that could result in personal injury or
death due to an electrical hazard.
WARNING: Warns against an action that could result in personal injury or death.

Introduction 1-1
1
Introduction
This chapter introduces the 2H252-25R SmartSwitch 2200 device and provides information about
how to obtain additional support from Enterasys Networks.
1.1 OVERVIEW
The 2H252-25R (Figure 1-1) is a high-performance Fast Ethernet switch that provides 24
auto-negotiating 10/100 BASE-TX ports via RJ45 Interfaces and one optional High Speed
Interface Module (HSIM) or Very High Speed Interface Module (VHSIM).
Figure 1-1 The 2H252-25R SmartSwitch 2200
Important Notice
Depending on the firmware version used in the 2H252-25R, some features described in this
document may not be supported. Refer to the Release Notes shipped with the 2H258-17R to
determine which features are supported.
4005_00_01
2H252-25R COM
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DPX-SPD
Network Ports 1-24
System
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LED MODE Switch
COM
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Port Status
LEDs
SIM/V SIM Slot
Reset
Switch
FAST ETHERNET WORKGROUP SW TCH

Overview
1-2 Introduction
The 2H252-25R is used to connect individual high-bandwidth user devices, such as workstations,
or to provide a central switching point for multiple 100-Mbps Fast Ethernet segments. The
optional HSIMs provide high speed uplinks to networking technologies such as Fast Ethernet,
Gigabit Ethernet, Fiber Distributed Data Interface (FDDI), Wide Area Network (WAN), and
Asynchronous Transfer Mode (ATM). Some HSIMs can provide additional Fast Ethernet ports in
varying media types. The optional VHSIMs provide very high speed uplinks to networking
technologies such as Gigabit Ethernet and ATM.
The 2H252-25R ports can be configured to control frame traffic in several ways, including
prioritizing traffic flow according to protocol type. The 2H252-25R can also be configured to
establish Virtual Local Area Networks (VLANs) and control the flow of frames associated with
each VLAN according to priority and Ether type. Detailed information about VLANs is provided
in the SmartSwitch Series 2E253, 2H252, 2H253 and 2H258 Local Management User’s Guide.
The 2H252-25R may be used as a tabletop unit or can be installed in a standard 19-inch rack using
the supplied rack mounting hardware.
The 2H252-25R has two power supplies. The power supplies load share 50% (+/-5%) of the power
required by the device. If one power supply fails, the remaining power supply assumes the entire
load of the device without interruption to network traffic. Each power supply module supports its
own ac input connection, which enables each power supply to be connected to a different ac power
circuit.
1.1.1 Connectivity
The 2H252-25R connects to Ethernet networks or workstations through the auto-negotiating
10/100 BASE-FX ports on the front panel. The device also has a slot for an optional HSIM or
VHSIM to provide additional connectivity to various networking technologies.
1.1.2 Runtime IP Address Discovery
This feature enables the 2H252-25R device to automatically accept an IP address from a Boot
Strap Protocol (BootP) server on the network without requiring a user to enter an IP address
through Local Management.
When the device is connected to the network and powered up, Runtime IP Address Discovery
(RAD) checks the device for an IP address. If one has not yet been assigned (device IP address set
to 0.0.0.0), RAD checks to see if any of the device interfaces have a link. If so, RAD sends out
Reverse Address Resolution Protocol (RARP) and BootP requests to obtain an IP address from a
BootP server on the network.

Overview
Introduction 1-3
The RAD requests start at an interval of 1 per second. The interval then doubles after every
transmission until an interval of 300 seconds is reached. At this point, the interval remains at 300
seconds. The RAD requests continue until an IP address is received from a RARP or BootP server,
or an IP address is entered using Local Management.
1.1.3 Full Duplex Switched Ethernet
Each switched Fast Ethernet port on the 2H252-25R supports 100 Mbps operation, and can operate
in Full Duplex Switched Ethernet (FDSE) mode. FDSE enables each port to provide up to
200 Mbps of bandwidth to connected devices that support FDSE.
1.1.4 SmartTrunk
Traditional 802.1D Spanning Tree Bridges only allow one active data path between any two
switches; all other parallel data paths are in Standby or Blocking mode. If one interface or path
should fail, then the other interface automatically comes out of Blocking mode and forwards all of
the traffic. This is fine for redundancy purposes. However, it is not the most efficient use of
resources.
SmartTrunk, also referred to as SmartTrunking, is Enterasys Networks’ terminology for load
balancing or load sharing. SmartTrunk provides the ability to take full advantage of the network’s
redundant bandwidth. SmartTrunk divides network traffic across multiple ports in parallel to
provide additional throughput. The SmartTrunk application can be used with any of Enterasys
Networks’ switch modules (except ATM modules).
For more information about SmartTrunk and how to configure it the SmartSwitch device, refer to
the Enterasys Networks SmartTrunk User’s Guide.
NOTE: The 2H252-25R will reboot after RAD is successful.

Overview
1-4 Introduction
1.1.5 Remote Monitoring (RMON)
The 2H252-25R supports all nine Ethernet RMON groups. The Statistics, Alarms, Events and
History groups are enabled on all ports by default.
Enterasys Networks RMON Actions is a vendor-specific extension of RMON and provides the
ability to set an “Action” on any SNMP MIB variable. The Action can be triggered by any RMON
Event and/or Alarm. An example of an Action would be to turn off a MIB-2 interface if a
broadcast threshold is crossed.
1.1.6 Broadcast Suppression
Broadcast Suppression enables a user to set a desired limit of receive broadcast frames per port/per
second to be forwarded out the other ports on the device. Any broadcast frames above this
specified limit are dropped. In the event that broadcast frames are being suppressed, multicast and
unicast frames continue to be switched.
1.1.7 Port/VLAN Redirect Functions
The port redirect function, also referred to as “Port Mirroring,” is a troubleshooting tool used to
map traffic from a single source port to a single destination port within the device. This feature
allows frames, including those with errors, to be copied and sent to an analyzer or RMON probe.
The analyzer or RMON probe will see the data as if it were directly connected to the LAN segment
of the source port.
The VLAN redirect function is similar to the port redirect function except that the frames received
by the device are redirected to a designated destination port according to the VLAN classification
of the frames received. Multiple VLANs can be directed to the same destination port. The VLAN
redirect function is only supported when the device is operating as an 802.1Q switch.
1.1.8 Rate Limiting
The Rate Limiting feature enables the SmartSwitch device to have control over traffic rates on a
per-port, per-priority basis. The network administrator can configure a rate limit (from 100 kbps to
1 Gbps) for a given port with an associated list of IEEE 802.1p priorities (which can include one,
some, or all of the eight priority levels defined in 802.1p). Each rate limit is specified as an
inbound or an outbound limit. The combined rate of all traffic on the port that matches the listed
priorities cannot exceed the programmed limit. If the rate exceeds the defined limit, frames are
dropped until the rate falls below the limit.