CHAPTER
32-1
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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32
Troubleshooting
This chapter describes how to identify and resolve Catalyst 2950 and Catalyst 2955 software problems
related to the Cisco 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
non-Long-Reach Ethernet (LRE) 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 Cisco IOS Release 12.1.
This chapter consists of these sections:
• Using Recovery Procedures, page 32-1
• Preventing Autonegotiation Mismatches, page 32-14
• GBIC and SFP Module Security and Identification, page 32-14
• Diagnosing Connectivity Problems, page 32-15
• Diagnosing LRE Connection Problems, page 32-18
• Using Debug Commands, page 32-19
• Using the show controllers Commands, page 32-22
• Using the crashinfo File, page 32-23
Using Recovery Procedures
These recovery procedures require that you have physical access to the switch:
• Recovering from Corrupted Software, page 32-2
• Recovering from Lost or Forgotten Passwords on Non-LRE Catalyst 2950 Switches, page 32-2
• Recovering from Lost or Forgotten Passwords on Catalyst 2950 LRE Switches, page 32-4
• Recovering from Lost or Forgotten Passwords on Catalyst 2955 Switches, page 32-8
• Recovering from a Command Switch Failure, page 32-10
• Recovering from Lost Member Connectivity, page 32-14
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