Using The Crashinfo File - Cisco WS-C3550-12G Software Configuration Manual

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Troubleshooting

Using the crashinfo File

The crashinfo file saves information that helps Cisco technical support representatives to debug

problems that caused the IOS image to fail (crash). The switch writes the crash information to the

console at the time of the failure, and the file is created the next time you boot the IOS image after the

failure (instead of while the system is failing).

The information in the file includes the IOS image name and version that failed, a dump of the processor

registers, and a stack trace. You can provide this information to the Cisco technical support

representative by using the show tech-support privileged EXEC command.

All crashinfo files are kept in this directory on the Flash file system:

flash:/crashinfo/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 Catalyst 3550 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 stacks or the show tech-support privileged EXEC

You can display the most recent crashinfo file (that is, the file with the highest sequence number at the

end of its filename) by entering the show stacks or 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.

Catalyst 3550 Multilayer Switch Software Configuration Guide

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