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Troubleshooting Guide 1-1

CHAPTER 1

INTRODUCTION

This guide is intended for use by network managers and technicians as an aid in identifying possible causes to

various types of network problems. Details on how to perform tests, use network management applications,

and LANVIEW LEDs are not covered except in a few isolated cases where the information appears in

examples or in the form of a note called,

TIP

LANVIEW LEDs used on Cabletron Systems modules or standalone devices may vary. For details on what the

LANVIEW LEDs indicate, refer to the manual associated with the particular module or standalone device.

Also, refer to these manuals for information concerning problems that may occur during installation and how

to use Local Management when applicable. Not all devices have Local Management.

The information in this guide is based on the most common problems that Cabletron Systems has encountered

servicing network systems. By easily identifying the possible causes and quickly isolating it to one cause,

immediate corrective action can be taken to help minimize network downtime.

Due to the vast number of potential problems that can occur in a network environment, only the most common

problems in each of seven categories are covered.

NOTE:

In this guide a problem is deﬁned as a failure occurring in the network after the network

has been properly installed and operating. Conﬁguration and application problems are not

covered in this guide.

1.1 How to Use This Guide

If you know what the problem is, refer to the table of contents ahead of this chapter for a complete list of the

problems covered in this guide, then to the chapter associated with the suspect problem for a possible quick

solution. Otherwise, refer to

Chapter 2

for guidelines about the following:

•

How to determine if a reported problem is actually a network problem.

•

How to isolate the problem down to a speciﬁc category of problems involving various network

technologies.

Once the problem has been isolated to a speciﬁc category, refer to the appropriate chapter (

through

) for a

list of the most common problems in that category. Each one of these chapters contains a category of problems

along with a guide to help isolate and correct each of the problems. The categories covered in this guide

include the following:

•

Booting/Image Code Loading Problems (

Chapter 3

)

•

Desktop Network Interface (DNI) Problems (

Chapter 4

)

•

Routing Problems (

Chapter 5

)

•

FDDI Problems (

Chapter 6

)

•

Ethernet Problems (

Chapter 7

)

•

Terminal Server Problems (

Chapter 8

)

•

Token Ring Problems (

Chapter 9

)

Check to see if any of the problems listed match the problem that you have identiﬁed.

Example

For some reason the network is acting up or went down completely. What do you do?

1 2 3 4 5 6 7 8 9 10 11 12 ... 113 114

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