1048
Troubleshooting
How to Troubleshoot
How to Troubleshoot
Recovering from Software Failures
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.
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.
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:
— Display the contents of the tar file by using the tar -tvf <image_filename.tar> UNIX command.
switch% tar -tvf image_filename.tar
— Locate the bin file, and extract it by using the tar -xvf <image_filename.tar> <image_filename.bin> UNIX
command.
switch% tar -xvf image_filename.tar image_filename.binx
x image_name.bin, 3970586 bytes, 7756 tape blocks
— Verify that the bin file was extracted by using the ls -l <image_filename.bin> UNIX command.
switch% ls -l image_filename.bin-rwxr-xr-x 1 bschuett eng 6365325 May 19 13:03
<insert path for lan base image>
-rw-r--r-- 1 boba 3970586 Apr 21 12:00 image_name.bin
3. Connect your PC with terminal-emulation software supporting the Xmodem Protocol to the switch console port.
4. Set the line speed on the emulation software to 9600 baud.
5. Unplug the switch power cord.
6. Press the Express Setup buttonfactory default button and at the same time, reconnect the power cord to the switch.
You can release the button a second or two after the LED above port 1 goes offwhen the password-recovery mechanism
is enabled.message appears. 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
load_helper
boot
7. Initialize the flash file system:
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