Cisco Systems 3750E manual Recovering from a Software Failure, 45-2

Chapter 45 Troubleshooting

Recovering from a Software Failure

•Using the show platform forward Command, page 45-23

•Using the crashinfo Files, page 45-25

•Using On-Board Failure Logging, page 45-26

Recovering from a Software Failure

Switch software can be corrupted during an upgrade, by downloading the wrong file to the switch, and by deleting the image file. In all of these cases, the switch does not pass the power-on self-test (POST), and there is no connectivity.

This procedure uses the Xmodem Protocol to recover from a corrupt or wrong image file. There are many software packages that support the Xmodem Protocol, and this procedure is largely dependent on the emulation software that you are using.

This recovery procedure requires that you have physical access to the switch.

Step 1 From your PC, download the software image tar file (image_filename.tar) from Cisco.com.

The Cisco IOS image is stored as a bin file in a directory in the tar file. For information about locating the software image files on Cisco.com, see the release notes.

Step 2 Extract the bin file from the tar file.

•If you are using Windows, use a zip program that can read a tar file. Use the zip program to navigate to and extract the bin file.

•If you are using UNIX, follow these steps:

1.Display the contents of the tar file by using the tar -tvf<image_filename.tar> UNIX command.

switch% tar -tvfimage_filename.tar

2.Locate the bin file, and extract it by using the tar -xvf<image_filename.tar> <image_filename.bin> UNIX command.

switch% tar -xvfimage_filename.tar image_filename.bin

x c3750e-universal-mz.122-35.SE2/c3750e-universal-mz.122-35.SE2.bin, 3970586 bytes, 7756 tape blocks

3.Verify that the bin file was extracted by using the ls -l<image_filename.bin> UNIX command.

switch% ls -limage_filename.bin

-rw-r--r-- 1 boba 3970586 Apr 21 12:00

c3750e-universal-mz.122-35.SE2/c3750e-universal-mz.122-35.SE2.bin

Step 3 Connect your PC with terminal-emulation software supporting the Xmodem Protocol to the switch console port.

Step 4 Set the line speed on the emulation software to 9600 baud.

Step 5 Unplug the switch power cord.

Step 6 Press the Mode button, and at the same time, reconnect the power cord to the switch.

You can release the Mode button a second or two after the LED above port 1 goes off. Several lines of information about the software appear along with instructions:

The system has been interrupted prior to initializing the flash file system. The following commands will initialize the flash file system, and finish loading the operating system software#

flash_init

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

45-2 OL-9775-02