CHAPTER
37-1
Catalyst 3550 Multilayer Switch Software Configuration Guide
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37
Troubleshooting
This chapter describes how to identify and resolve Catalyst 3550 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.
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 37-1
• Preventing Autonegotiation Mismatches, page 37-10
• GBIC Module Security and Identification, page 37-10
• Diagnosing Connectivity Problems, page 37-11
• Using Debug Commands, page 37-16
• Using the show forward Command, page 37-19
• Using the crashinfo File, page 37-20
Note If after applying ACLs, you are experiencing packet performance problems or receiving messages about
TCAM capacity, see the “Displaying ACL Resource Usage and Configuration Problems” section on
page 28-43.
Using Recovery Procedures
These recovery procedures require that you have physical access to the switch:
• Recovering from Corrupted Software, page 37-2
• Recovering from a Lost or Forgotten Password, page 37-2
• Recovering from a Command Switch Failure, page 37-6
• Recovering from Lost Member Connectivity, page 37-10
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