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CHAPTER
49-1
Catalyst 3750 Switch Software Configuration Guide
OL-8550-09
49
Troubleshooting
This chapter describes how to identify and resolve software problems related to the Cisco IOS software
on the Catalyst 3750 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.
Unless otherwise noted, the term switch refers to a standalone switch and to a switch stack.
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 Commands Master List, Release 12.2 from the Cisco.com
page under Documentation > Cisco IOS Software > 12.2 Mainline > Command References.
This chapter consists of these sections:
• Recovering from a Software Failure, page 49-2
• Recovering from a Lost or Forgotten Password, page 49-3
• Preventing Switch Stack Problems, page 49-8
• Recovering from a Command Switch Failure, page 49-8
• Recovering from Lost Cluster Member Connectivity, page 49-12
Note Recovery procedures require that you have physical access to the switch.
• Preventing Autonegotiation Mismatches, page 49-12
• Troubleshooting Power over Ethernet Switch Ports, page 49-13
• SFP Module Security and Identification, page 49-13
• Monitoring SFP Module Status, page 49-14
• Monitoring Temperature, page 49-14
• Using Ping, page 49-14
• Using Layer 2 Traceroute, page 49-16
• Using IP Traceroute, page 49-17
• Using TDR, page 49-19
• Using Debug Commands, page 49-20