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CHAPTER
38-1
Catalyst 2960 and 2960-S Switch Software Configuration Guide
OL-8603-09
38
Troubleshooting
This chapter describes how to identify and resolve software problems related to the Cisco IOS software
on the Catalyst 2960 and 2960-S switches. 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.
Note Stacking is supported only on Catalyst 2960-S switches running the LAN base image.
Additional troubleshooting information, such as LED descriptions, is provided in the hardware
installation guide.
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 38-2
• Recovering from a Lost or Forgotten Password, page 38-3
• Preventing Switch Stack Problems, page 38-8
• Recovering from a Command Switch Failure, page 38-8
• Recovering from Lost Cluster Member Connectivity, page 38-12
Note Recovery procedures require that you have physical access to the switch.
• Preventing Autonegotiation Mismatches, page 38-12
• Troubleshooting Power over Ethernet Switch Ports, page 38-13
• SFP Module Security and Identification, page 38-13
• Monitoring SFP Module Status, page 38-14
• Using Ping, page 38-14
• Using Layer 2 Traceroute, page 38-15
• Using IP Traceroute, page 38-17
• Using TDR, page 38-19
• Using Debug Commands, page 38-20