Cisco Systems OL-8550-09 Using the crashinfo Files

49-24

Catalyst 3750 SwitchSoftware Configuration Guide

OL-8550-09

Chapter49 Troubleshooting

Using the crashinfo Files

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Egress:Asic 3, switch 1

Output Packets:

------------------------------------------

Packet 1

Lookup Key-Used Index-Hit A-Data

OutptACL 50_10010A05_0A010505-00_40000014_000A0000 01FFE 03000000

Port Vlan SrcMac DstMac Cos Dscpv

Gi1/0/2 0007 XXXX.XXXX.0246 0009.43A8.0147

Using the 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.

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 stacks or 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 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.

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.