Specifications

CHAPTER

29-1

Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide

78-11380-07

Troubleshooting

This chapter describes how to identify and resolve Catalyst 2950 and Catalyst 2955 software problems

related to the IOS software. Depending on the nature of the problem, you can use the command-line

interface (CLI) or the Cluster Management Suite (CMS) to identify and solve problems. To identify and

resolve Cisco-approved Course Wave Division Multiplexer (CWDM) Gigabit Interface Converter

(GBIC) problems, you must have the enhanced software image (EI) installed on your Catalyst 2950

switch.

Note For complete syntax and usage information for the commands used in this chapter, refer to the command

reference for this release and the Cisco IOS Command Summary for Release 12.1.

This chapter consists of these sections:

• Using Recovery Procedures, page 29-1

• Preventing Autonegotiation Mismatches, page 29-10

• GBIC Module Security and Identification, page 29-10

• Diagnosing Connectivity Problems, page 29-11

• Using Debug Commands, page 29-14

• Using the crashinfo File, page 29-17

Using Recovery Procedures

These recovery procedures require that you have physical access to the switch:

• Recovering from Corrupted Software, page 29-2

• Recovering from a Lost or Forgotten Password, page 29-2

• Recovering from a Lost or Forgotten Password on the Catalyst 2955 Switch, page 29-4

• Recovering from a Command Switch Failure, page 29-6

• Recovering from Lost Member Connectivity, page 29-10