Cabletron Systems 2E48-27R User manual

9032314-04
2E48-27R/2E49-27R
SmartSwitch 2200
User’s Guide
COM
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2E48-27R/2E49-27R User’s Guide i
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 FORANY 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.
 1998 by Cabletron Systems, Inc., P.O. Box 5005, Rochester, NH 03866-5005
All Rights Reserved
Printed in the United States of America
Order Number: 9032314-04 September 1998
Cabletron Systems , SPECTRUM , LANVIEW , QuickSET , and S
ecure
F
ast
are registered
trademarks and SmartSwitch is a trademark of Cabletron Systems, Inc.
All other product names mentioned in this manual may be trademarks or registered trademarks of
their respective companies.
FCC NOTICE
This device complies with Part 15 of the FCC rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation.
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a commercial environment.
This equipment uses, generates, and can radiate radio frequency energy and if not installed in
accordance with the operator’s manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause interference in which case the user
will be required to correct the interference at his own expense.
WARNING: Changes or modifications made to this device which are not expressly approved by the
party responsible for compliance could void the user’s authority to operate the equipment.
Only qualified personnel should perform installation
procedures.
Printed on Recycled Paper

Notice
ii 2E48-27R/2E49-27R User’s Guide
INDUSTRY CANADA NOTICE
This digital apparatus does not exceed the ClassA 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. IFYOU 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 permitted by the
Copyright Act of the United States or as authorized in writing by Cabletron.
2. OTHER RESTRICTIONS. You may not reverse engineer, decompile, or disassemble the
Program.
3. APPLICABLE LAW. This License Agreement shall be interpreted and governed under the laws
and in the state and federal courts of New Hampshire. You accept the personal jurisdiction and
venue of the New Hampshire courts.

Notice
2E48-27R/2E49-27R User’s Guide iii
EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY
1. EXCLUSION OF WARRANTY. Except as may be specifically provided by Cabletron in
writing, Cabletron makes no warranty, expressed or implied, concerning the Program (including
its documentation and media).
CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUPPLIED TO
YOU BY CABLETRON IN WRITING, EITHER EXPRESSED OR IMPLIED, INCLUDING
BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE, WITH RESPECT TO THE PROGRAM, THE
ACCOMPANYING WRITTEN MATERIALS, AND ANY ACCOMPANYING HARDWARE.
2. NO LIABILITY FOR CONSEQUENTIAL DAMAGES. IN NO EVENT SHALL
CABLETRON OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER
(INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS,
PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, SPECIAL,
INCIDENTAL, CONSEQUENTIAL, OR RELIANCE DAMAGES, OR OTHER LOSS)
ARISING OUT OF THE USE OR INABILITY TO USE THIS CABLETRON PRODUCT,
EVEN IF CABLETRON HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES. BECAUSE SOME STATES DO NOT ALLOW THE EXCLUSION OR
LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES, OR
ON THE DURATION OR LIMITATION OF IMPLIED WARRANTIES, IN SOME
INSTANCES THE ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO
YOU.
UNITED STATES GOVERNMENT RESTRICTED RIGHTS
The enclosed product (a) was developed solely at private expense; (b) contains “restricted computer
software” submitted with restricted rights in accordance with Section 52227-19 (a) through (d) of the
Commercial Computer Software - Restricted Rights Clause and its successors, and (c) in all respects
is proprietary data belonging to Cabletron and/or its suppliers.
For Department of Defense units, the product is licensed with “Restricted Rights” as defined in the
DoD Supplement to the Federal Acquisition Regulations, Section 52.227-7013 (c) (1) (ii) and its
successors, and use, duplication, disclosure by the Government is subject to restrictions as set forth in
subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at
252.227-7013. Cabletron Systems, Inc., 35 Industrial Way, Rochester, New Hampshire 03867-0505.

Notice
iv 2E48-27R/2E49-27R User’s Guide
SAFETY INFORMATION
CLASS 1 LASER TRANSCEIVERS
THE FE-100F3 FAST ETHERNET INTERFACE MODULE, FPIM-05 AND
FPIM-07 FDDI PORT INTERFACE MODULES, AND APIM-29 ATM
PORT INTERFACE MODULE USE CLASS 1 LASER TRANSCEIVERS.
READ THE FOLLOWING SAFETY INFORMATION BEFORE
INSTALLING OR OPERATING THESE MODULES.
The Class 1 laser transceivers use an optical feedback loop to maintain Class 1 operation limits. This
control loop eliminates the need for maintenance checks or adjustments. The output is factory set, and
does not allow any user adjustment. Class 1 Laser transceivers comply with the following safety
standards:
• 21 CFR 1040.10 and 1040.11 U.S. Department of Health and Human Services (FDA).
• IEC Publication 825 (International Electrotechnical Commission).
• CENELEC EN 60825 (European Committee for Electrotechnical Standardization).
When operating within their performance limitations, laser transceiver output meets the Class 1
accessible emission limit of all three standards. Class 1 levels of laser radiation are not considered
hazardous.
SAFETY INFORMATION
CLASS 1 LASER TRANSCEIVERS
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
-6
watts.
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 not use optical instruments 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
removed from the network adapter.

Notice
2E48-27R/2E49-27R User’s Guide v
DECLARATION OF CONFORMITY
Application of Council Directive(s): 89/336/EEC
73/23/EEC
Manufacturer’s Name: Cabletron Systems, Inc.
Manufacturer’s Address: 35 Industrial Way
PO Box 5005
Rochester, NH 03867
European Representative Name: Mr. J. Solari
European Representative Address: Cabletron Systems Limited
Nexus House, Newbury Business Park
London Road, Newbury
Berkshire RG13 2PZ, England
Conformance to Directive(s)/Product Standards: EC Directive 89/336/EEC
EC Directive 73/23/EEC
EN 55022
EN 50082-1
EN 60950
Equipment Type/Environment: Networking Equipment, for use in a
Commercial or Light
Industrial
Environment.
We the undersigned, hereby declare, under our sole responsibility, that the equipment packaged
with this notice conforms to the above directives.
Manufacturer Legal Representative in Europe
Mr. Ronald Fotino Mr. J. Solari
___________________________________ ___________________________________
Full Name Full Name
Principal Compliance Engineer Managing Director - E.M.E.A.
___________________________________ ___________________________________
Title Title
Rochester, NH, USA Newbury, Berkshire, England
___________________________________ ___________________________________
Location Location

Notice
vi 2E48-27R/2E49-27R User’s Guide

2E48-27R/2E49-27R User’s Guide vii
CONTENTS
CHAPTER 1 INTRODUCTION
1.1 Using This Guide.........................................................................1-1
1.2 Structure of This Guide................................................................1-1
1.3 2E4X-27R Overview....................................................................1-2
1.3.1 Connectivity ....................................................................1-4
1.3.2 Full Duplex Switched Ethernet........................................1-4
1.3.3 SmartTrunk.....................................................................1-4
1.3.4 Runtime IP Address Discovery.......................................1-5
1.3.5 Management...................................................................1-5
1.3.6 Switching Options...........................................................1-6
1.3.7 Standards Compatibility..................................................1-6
1.3.8 Year 2000 Compliant......................................................1-6
1.3.9 LANVIEW Diagnostic LEDs............................................1-6
1.3.10 Optional Features ...........................................................1-7
1.4 Document Conventions...............................................................1-8
1.5 Getting Help.................................................................................1-9
1.6 Related Manuals........................................................................1-10
CHAPTER 2 NETWORK REQUIREMENTS
2.1 SmartTrunk..................................................................................2-1
2.2 10BASE-F Network .....................................................................2-1
2.3 FOIRL Fiber Optic Network.........................................................2-2
2.4 100BASE-TX Network.................................................................2-2
2.5 100BASE-FX Fiber Optic Network ..............................................2-2
CHAPTER 3 INSTALLATION
3.1 Unpacking the 2E4X-27R............................................................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 to the 2E4X-27R...............................3-7
3.4 Connecting to the Network..........................................................3-8
3.4.1 Connecting Fiber Optic Cables to Ports 1
Through 24 .....................................................................3-9
3.4.2 Connecting a UTP Segment to the FE-100TX..............3-10
3.4.3 Connecting a Fiber Optic Segment to the
FE-100FX and FE-100F3 .............................................3-12
3.5 Completing the Installation........................................................3-14

Contents
viii 2E48-27R/2E49-27R User’s Guide
CHAPTER 4 TROUBLESHOOTING
4.1 Using LANVIEW...........................................................................4-1
4.2 FE-100TX LED.............................................................................4-4
4.3 Troubleshooting Checklist............................................................4-6
4.4 Using the RESET Button .............................................................4-7
CHAPTER 5 LOCAL MANAGEMENT
5.1 Overview......................................................................................5-1
5.2 Local Management Keyboard Conventions.................................5-2
5.3 Management Terminal Setup.......................................................5-3
5.3.1 Console Cable Connection..............................................5-4
5.3.2 Management Terminal Setup Parameters ......................5-5
5.3.3 Telnet Connections .........................................................5-6
5.3.4 Monitoring an Uninterruptible Power Supply...................5-7
5.4 Accessing Local Management.....................................................5-8
5.4.1 Navigating Local Management Screens..........................5-9
5.4.2 Selecting Local Management Menu Screen Items........5-11
5.4.3 Exiting Local Management Screens..............................5-11
5.5 Device Menu Screen..................................................................5-13
5.6 Device Configuration Menu Screen ...........................................5-14
5.7 General Configuration Screen ...................................................5-17
5.7.1 Setting the IP Address...................................................5-20
5.7.2 Setting the Subnet Mask...............................................5-21
5.7.3 Setting the Default Gateway..........................................5-23
5.7.4 Setting the TFTP Gateway IP Address .........................5-23
5.7.5 Setting the Device Date.................................................5-24
5.7.6 Setting the Device Time................................................5-25
5.7.7 Entering a New Screen Refresh Time...........................5-25
5.7.8 Setting the Screen Lockout Time..................................5-26
5.7.9 Setting the Operational Mode........................................5-26
5.7.10 Configuring the COM Port.............................................5-28
5.7.10.1 Changing the Com Port Application..............5-30
5.7.11 Clearing NVRAM...........................................................5-31
5.7.12 Enabling/Disabling IP Fragmentation............................5-32
5.8 SNMP Community Names Screen.............................................5-33
5.8.1 Establishing Community Names ...................................5-35
5.9 SNMP Traps Screen..................................................................5-36
5.9.1 Configuring the Trap Table............................................5-37
5.10 Switch Configuration Screen......................................................5-38
5.10.1 Setting the STA.............................................................5-40
5.10.2 Setting the Age Time Field............................................5-41
5.10.3 Setting (Enabling or Disabling) the Port Status.............5-41

Contents
2E48-27R/2E49-27R User’s Guide ix
5.11 Ethernet Full Duplex Configuration Screen...............................5-42
5.11.1 Setting the Operation Mode..........................................5-44
5.12 Device Specific Configuration Menu Screen.............................5-45
5.13 System Resources Screen........................................................5-47
5.13.1 Setting the Reset Peak Switch Utilization.....................5-48
5.14 High Speed Interface Configuration Menu Screen....................5-49
5.15 High Speed Interface Configuration Screen..............................5-50
5.15.1 Configuring an FE-100FX or FE-100F3........................5-53
5.15.1.1 Setting the FE-100FX or FE-100F3
Operational Mode.........................................5-53
5.15.2 Configuring an FE-100TX.............................................5-54
5.15.2.1 Setting the FE-100TX Operational Mode.....5-54
5.15.2.2 Setting the FE-100TX Advertised Ability......5-54
5.16 FLASH Download Screen..........................................................5-55
5.16.1 Image File Download Using BootP...............................5-58
5.16.2 Image File Download Using TFTP................................5-58
5.16.3 Image File Download Using Runtime ...........................5-59
5.17 Port Redirect Function Screen ..................................................5-60
5.17.1 Displaying the Source and Destination Entries.............5-62
5.17.2 Changing Source and Destination Ports.......................5-63
5.18 Broadcast Suppression Screen.................................................5-64
5.18.1 Setting the Threshold....................................................5-65
5.18.2 Setting the Reset Peak.................................................5-66
5.19 Device Statistics Menu Screen..................................................5-66
5.20 Switch Statistics Screen............................................................5-68
5.20.1 Using the Clear Counters Command............................5-69
5.21 Interface Statistics Screen.........................................................5-70
5.21.1 Displaying Interface Statistics.......................................5-73
5.21.2 Using the Clear Counters Command............................5-74
5.22 RMON Statistics Screen............................................................5-74
5.22.1 Displaying RMON Statistics..........................................5-78
5.22.2 Using the Clear Counters Command............................5-78
5.23 Network Tools............................................................................5-79
5.23.1 Built-in Commands .......................................................5-81
5.23.2 Special Commands.......................................................5-89
APPENDIX A SPECIFICATIONS
A.1 Device Specifications ..................................................................A-1
A.2 Physical Properties......................................................................A-1
A.3 Electrical Specifications...............................................................A-1
A.4 Environmental Requirements......................................................A-2
A.5 Input/Output Ports .......................................................................A-2
A.6 COM Port/Pin Assignments.........................................................A-3
A.7 Regulatory Compliance...............................................................A-3

Contents
x 2E48-27R/2E49-27R User’s Guide
APPENDIX B FE-100TX, FE-100FX, AND FE-100F3
SPECIFICATIONS
B.1 FE-100TX.................................................................................... B-1
B.1.1 Auto-Negotiation............................................................. B-2
B.2 FE-100FX.................................................................................... B-3
B.3 FE-100F3.................................................................................... B-4
APPENDIX C OPTIONAL INSTALLATIONS AND
MODE SWITCH BANK SETTINGS
C.1 Required Tools............................................................................C-2
C.2 Removing the Chassis Cover .....................................................C-2
C.2.1 Setting the Mode Switches.............................................C-4
C.3 Installing Optional Fast Ethernet Interface Modules ...................C-7
INDEX

2E48-27R/2E49-27R User’s Guide 1-1
CHAPTER 1
INTRODUCTION
Welcome to the 2E48-27R/2E49-27R SmartSwitch 2200 User’s Guide .
This guide describes the 2E48-27R and 2E49-27R SmartSwitch 2200
devices and provides information concerning network requirements,
installation, troubleshooting, and the use of Local Management.
1.1 USINGTHIS GUIDE
Read through this guide completely to understand the 2E48-27R and
2E49-27R features, capabilities, and Local Management functions. 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.
1.2 STRUCTURE OFTHIS GUIDE
This guide is organized as follows:
Chapter 1, Introduction , outlines the contents of this manual and briefly
describes the 2E4X-27R features. Directions about how to obtain
additional help and a list of related manuals are also included.
Chapter 2, Network Requirements , explains the network requirements
to consider before installing the 2E4X-27R.
Chapter 3, Installation , provides instructions on how to install the
2E4X-27R and connect segments to the device.
Chapter 4, Troubleshooting , describes the function of the LANVIEW
LEDs, which can help to quickly diagnose network/operational problems.
Chapter 5, Local Management , describes how to access Local
Management and use the Local Management screens to manage the
2E4X-27R.
NOTE
Unless noted differently, the information in this guide applies to
both of the SmartSwitch 2200 devices, which are referred to as
either “2E4X-27R” or “device.”

Chapter 1: Introduction
1-2 2E48-27R/2E49-27R User’s Guide
Appendix A, Specifications , contains information on functionality and
operating specifications, connector pinouts, environmental requirements,
and physical properties.
Appendix B, FE-100TX, FE-100FX, and FE-100F3 Specifications ,
contains information about FE-100TX pinouts and information
concerning cable types used with the FE-100FX and FE-100F3.
Appendix C, Optional Installations and Mode Switch Bank Settings ,
describes how to install optional Fast Ethernet Interface Modules and how
to set the Mode Switch.
1.3 2E4X-27R OVERVIEW
The 2E4X-27R devices are 24-port (plus three optional) high-speed
network switching devices that support traditional switching (bridging)
and Cabletron Systems SecureFast Switching Virtual Network
technology. The 2E4X-27R can connect individual high-bandwidth user
devices, such as workstations, and provide a central switching point for
multiple Ethernet segments built using devices such as Cabletron Systems
HubSTACK or other third party stackable devices. The 2E4X-27R
devices also have redundant power supplies.
The 2E48-27R and 2E49-27R, shown in Figure 1-1, are identical products
except that ports 1 through 24 of the 2E48-27R support multimode fiber
optic cabling while ports 1 through 24 of the 2E49-27R support single
mode fiber optic cabling.
Ports 25 and 26 on the 2E4X-27R support optional Fast Ethernet Interface
Modules and can provide uplinks to 100BASE-TX or 100BASE-FX Fast
Ethernet networks. Port 27 supports an optional High Speed Interface
Module (HSIM) that provides additional connectivity to various
networking technologies such as Asynchronous Transfer Mode (ATM)
and Fiber Distributed Data Interface (FDDI), Gigabit Ethernet, and Wide
Area Network (WAN).

2E4X-27R Overview
2E48-27R/2E49-27R User’s Guide 1-3
Figure 1-1 The 2E48-27R and 2E49-27R
The 2E4X-27R is a tabletop unit that can be installed in a standard
19-inch rack using the supplied rack mounting hardware.
The 2E4X-27R 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 allows the user to connect
each power supply to a different ac power circuit.
23141_01
RESET Button
RESET Button
Network Ports 1 - 24
(ST connectors),
Supports
Multimode
Fiber Optics
Optional Fast Ethernet Interface
Module Ports 25 and 26
COM Port
System LEDs
Port Status LEDs
Network Ports 1 - 24
(ST connectors),
Supports
Single Mode
Fiber Optics
Optional Fast Ethernet Interface
Module Ports 25 and 26
COM Port
System LEDs
Port Status LEDs
COM
RESET
PWR
CPU
2E48-27R 25 26
COM
RESET
PWR
CPU
2E49-27R 25 26
Optional HSIM Slot
Optional HSIM Slot
2E48-27R
2E49-27R
RX TX
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16
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23
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10
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RX TX
3
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18
RX TX
2
10
17
RX TX
1
RX TX
9
RX TX

Chapter 1: Introduction
1-4 2E48-27R/2E49-27R User’s Guide
1.3.1 Connectivity
The 2E48-27R connects to Ethernet networks or workstations through 24
ST fiber optic ports on the front panel. These ports support multimode
fiber optic cables at lengths up to 2 kilometers. The ports are IEEE 802.3
10BASE-F compliant.
The 2E49-27R connects to Ethernet networks or workstations through 24
ST fiber optic ports on the front panel. These ports support single mode
fiber optic cables at lengths up to 5 kilometers. The ports are FOIRL
compliant.
All of the devices have two front panel slots (ports 25 and 26) for optional
Fast Ethernet Interface Modules to support an uplink to 100 Mbps Fast
Ethernet backbones or a high speed connection to a local server. There is
also space for an optional HSIM to provide additional connectivity to
various networking technologies.
1.3.2 Full Duplex Switched Ethernet
Each switched Ethernet port supports full wire-speed Ethernet
communications and can be configured to operate in Full Duplex
Switched Ethernet (FDSE) mode. FDSE allows each port to provide a
dedicated 20 Mbps bandwidth for file server or high-end workstation
connections. The optional Fast Ethernet ports provide up to 200 Mbps of
bandwidth.
1.3.3 SmartTrunk
SmartTrunk, also referred to as SmartTrunking, is Cabletron Systems’
terminology for load balancing or load sharing. SmartTrunk technology
provides an easy-to-implement mechanism to group, or aggregate,
multiple physical links together to scale the backbone bandwidth beyond
the limitations of a single link. All links are user-configurable so
administrators can scale the backbone bandwidth by adding SmartTrunk
links. The SmartTrunk benefits are as follows:
• All purchased bandwidth is used.
• Distributed, resilient links increase reliability and performance.
• Multiple technologies are supported within a single trunk for
maximum flexibility.

2E4X-27R Overview
2E48-27R/2E49-27R User’s Guide 1-5
For more information about SmartTrunk, refer to the Cabletron Systems
SmartTrunk User’s Guide .
1.3.4 Runtime IP Address Discovery
This feature enables the 2E4X-27R to automatically accept an IP address
from a Boot Strap Protocol (BootP) server on the network into NVRAM
without requiring a user to enter an IP address through Local
Management.
When the 2E4X-27R is connected to the network and powered up,
Runtime IP Address Discovery (RAD) checks the 2E4X-27R for an IP
address. If one has not yet been assigned (2E4X-27R IP address set to
0.0.0.0), RAD checks to see if any of the 2E4X-27R 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 or RARP server
on the network.
The RAD requests start out at an interval of 1 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 BootP or RARP
server, or an IP address is entered using Local Management.
1.3.5 Management
Management of the 2E4X-27R is accomplished using SNMP compliant
management tools for in-band management. Out-of-band Local
Management is provided through the RJ45 COM port on the front panel
using a VT100 terminal or a VT100 terminal emulator. Local
Management can also be accessed through a Telnet connection to the
RJ45 COM port.
Local Management provides the ability to manage the 2E4X-27R and any
of the optional Fast Ethernet Interface Modules installed in ports 25 and
26 and the optional High Speed Interface Module (HSIM).
The user’s guide for the HSIM provides detailed information about Local
Management for the HSIM.
Information about how to access and use Local Management is contained
in Chapter 5.

Chapter 1: Introduction
1-6 2E48-27R/2E49-27R User’s Guide
1.3.6 Switching Options
The 2E4X-27R provides IEEE 802.1D switching, IEEE 802.1Q
switching, or SecureFast SwitchingVirtual Network Services between all
of the front panel interfaces including Fast Ethernet Interface Modules
and High Speed Interface Modules (HSIMs).
802.1Q switching and SecureFast switching allow for future migration to
Virtual Network technologies without requiring the replacement of
existing equipment.
1.3.7 Standards Compatibility
The 2E4X-27R is fully compliant with the IEEE 802.3 standard. The
optional Fast Ethernet Interface Modules are fully compliant with the
IEEE 802.3u standard.The 2E4X-27R provides IEEE 802.1D Spanning
Tree Algorithm (STA) support to enhance the overall reliability of the
network and protect against “loop” conditions. The 2E4X-27R supports a
wide variety of industry standard MIBs including RFC 1213 (MIB II),
RFC 1757 (RMON), RFC 1493 (Bridge MIB) and RFC 1354 (FIB MIB).
A full suite of Cabletron Systems Enterprise MIBs provide a wide array
of statistical information to enhance troubleshooting.
1.3.8 Year 2000 Compliant
The 2E4X-27R has an internal clock that can maintain the current time
and date beyond the year 1999.
1.3.9 LANVIEW Diagnostic LEDs
LANVIEW diagnostic LEDs serve as an important troubleshooting aid by
providing an easy way to observe the status of individual ports and overall
network operations. Chapter 4 provides details about the 2E4X-27R
LANVIEW LEDs.

2E4X-27R Overview
2E48-27R/2E49-27R User’s Guide 1-7
1.3.10 Optional Features
Options for the 2E4X-27R are Fast Ethernet Interface Modules and High
Speed Interface Modules, which add remote uplink capability.
Cabletron Systems provides Fast Ethernet Interface Modules to support
uplinks to 100 Mbps Ethernet backbones or high speed connections to
local servers. Table 1-1 provides a list of the Fast Ethernet Interface
Modules.
.
High Speed Interface Modules (HSIMs) are available from Cabletron
Systems for additional connectivity to various networking technologies.
The HSIMs available for the 2E4X-27R are listed in the Release Notes.
Table 1-1 Fast Ethernet Interface Modules
P/N Description Application
FE-100TX Uses RJ45
connector
Supports Category 5 Unshielded Twisted Pair
(UTP) cabling, which has an impedance of 85 to
111 ohms, and type 1A Shielded Twisted Pair
(STP) cabling.
FE-100FX Uses SC
connector Supports multimode fiber optic cabling.
FE-100F3 Uses SC
connector Supports single mode fiber optic cabling.

Chapter 1: Introduction
1-8 2E48-27R/2E49-27R User’s Guide
1.4 DOCUMENT CONVENTIONS
The following conventions are used throughout this document:
NOTE
Note symbol. Calls the reader’s attention to any item of
information that may be of special importance.
TIP
Tip symbol. Conveys helpful hints concerning procedures or
actions.
!
CAUTION
Caution symbol. Contains information essential to avoid
damage to the equipment.
Electrical Hazard Warning symbol.Warns against an action
that could result in personal injury or death due to an electrical
hazard.
WARNING
Warning symbol.Warns against an action that could result in
personal injury or death.