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CHAPTER
31-1
Catalyst 2960 Switch Software Configuration Guide
78-16881-01
31
Troubleshooting
This chapter describes how to identify and resolve software problems related to the Cisco IOS software
on the Catalyst 2960 switch. Depending on the nature of the problem, you can use the command-line
interface (CLI), the device manager, or Network Assistant to identify and solve problems.
Additional troubleshooting information, such as LED descriptions, is provided in the hardware
installation guide.
Note For complete syntax and usage information for the commands used in this chapter, see the command
reference for this release and the Cisco IOS Command Summary, Release 12.2.
This chapter consists of these sections:
• Recovering from a Software Failure, page 31-2
• Recovering from a Lost or Forgotten Password, page 31-3
• Recovering from a Command Switch Failure, page 31-7
• Recovering from Lost Cluster Member Connectivity, page 31-11
Note Recovery procedures require that you have physical access to the switch.
• Preventing Autonegotiation Mismatches, page 31-11
• SFP Module Security and Identification, page 31-11
• Monitoring SFP Module Status, page 31-12
• Using Ping, page 31-12
• Using Layer 2 Traceroute, page 31-13
• Using IP Traceroute, page 31-15
• Using TDR, page 31-17
• Using Debug Commands, page 31-18
• Using the show platform forward Command, page 31-19
• Using the crashinfo File, page 31-21