Cisco Systems 3750E Using On-Board Failure Logging

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Catalyst 3750-E and 3560-E Switch Software Configuration Guide

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Chapter45 Troubleshooting

Using On-Board Failure Logging

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.

Extended crashinfo files are kept in this directory on the fla sh 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.

Using On-Board Failure Logging

You can use the on-board-failure logging (OBFL) feature to collect information about the switch and the

field-replaceable unit (FRU) devices that are connected to it. The information includes uptime,

temperature, and voltage information and helps Cisco technical support representatives to troubleshoot

switch problems. We recommend that you keep OBFL enabled and do not erase the data stored in the

flash memory.

This section has this information:

•Understanding OBFL, page 45-26

•Configuring OBFL, page 45-27

•Displaying OBFL Information, page 45-28

By default, OBFL is enabled. It collects information about the switch and the FRU devices, including

power supplies, redundant power systems, and small form-factor pluggable (SFP) modules. The switch

stores this information in the flash memory:

•CLI commands—Record of the OBFL CLI commands that are entere d on a standalone switch or a

switch stack member

•Environment data—Unique device identifier (UDI) information for a standalone switch or a stack

member and for all the connected FRU devices: the product identification (PID), the version

identification (VID), and the serial number

•Message—Record of the hardware-related system messages generated by a stand alone switch or a

stack member