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Troubleshooting
Information for Troubleshooting
Use TDR to diagnose and resolve cabling problems in these situations:
Replacing a switch
Setting up a wiring closet
Troubleshooting a connection between two devices when a link cannot be established or when it is not operating
properly
Crashinfo Files
The crashinfo files save information that helps Cisco technical support representatives to debug problems that caused
the Cisco IOS image to fail (crash). The switch writes the crash information to the console at the time of the failure. The
switch creates two types of crashinfo files:
Basic crashinfo file—The switch automatically creates this file the next time you boot up the Cisco IOS image after
the failure.
Extended crashinfo file—The switch automatically creates this file when the system is failing.
Basic crashinfo Files
The information in the basic file includes the Cisco IOS image name and version that failed, a list of the processor
registers, and other switch-specific information. You can provide this information to the Cisco technical support
representative by using the show tech-support privileged EXEC command.
Basic crashinfo files are kept in this directory on the flash file system:
flash:/crashinfo/.
The filenames are crashinfo_n where n is a sequence number.
Each new crashinfo file that is created uses a sequence number that is larger than any previously existing sequence
number, so the file with the largest sequence number describes the most recent failure. Version numbers are used
instead of a timestamp because the switches do not include a real-time clock. You cannot change the name of the file
that the system will use when it creates the file. However, after the file is created, you can use the rename privileged
EXEC command to rename it, but the contents of the renamed file will not be displayed by the show tech-support
privileged EXEC command. You can delete crashinfo files by using the delete privileged EXEC command.
You can display the most recent basic crashinfo file (that is, the file with the highest sequence number at the end of its
filename) by entering the show tech-support privileged EXEC command. You also can access the file by using any
command that can copy or display files, such as the more or the copy privileged EXEC command.
Extended crashinfo Files
The switch creates the extended crashinfo file when the system is failing. The information in the extended file includes
additional information that can help determine the cause of the switch failure. You provide this information to the Cisco
technical support representative by manually accessing the file and using the more or the copy privileged EXEC
command.
Extended crashinfo files are kept in this directory on the flash file system:
flash:/crashinfo_ext/.
The filenames are crashinfo_ext_n where n is a sequence number.
You can configure the switch to not create the extended creashinfo file by using the no exception crashinfo global
configuration command.
1046
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Troubleshooting
