CHAPTER
45-1
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
45
Troubleshooting
This chapter describes how to identify and resolve software problems related to the Cisco IOS software
on the Catalyst 3750-E or 3560-E switch. Depending on the nat ure 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 Catalyst 3750-E or 3560-E standalone switch and to
a Catalyst 3750-E switch stack.
Additional troubleshooting information, such as LED descript ions, 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 45-2
•Recovering from a Lost or Forgotten Password, page 45-3
•Preventing Switch Stack Problems, page 45-8
•Recovering from a Command Switch Failure, page 45-9
•Recovering from Lost Cluster Member Connectivity, page 45-13
Note Recovery procedures require that you have physical access to the switch.
•Preventing Autonegotiation Mismatches, page 45-13
•Troubleshooting Power over Ethernet Switch Ports, page 45-13
•SFP Module Security and Identification, page 45-14
•Monitoring SFP Module Status, page 45-15
•Monitoring Temperature, page 45-15
•Using Ping, page 45-15
•Using Layer 2 Traceroute, page 45-17
•Using IP Traceroute, page 45-18
•Using TDR, page 45-20
•Using Debug Commands, page 45-21