Recovering From Corrupted Software; Using Debug Commands - Cisco Catalyst 2950 Software Configuration Manual

Chapter 26 Troubleshooting
Step 16 Return to privileged EXEC mode:
switch(config)# exit
switch#
Step 17 Write the running configuration to the startup configuration file:
switch# copy running-config startup-config
The new password is now included in the startup configuration.

Recovering from Corrupted Software

Switch software can be corrupted during an upgrade, by downloading the wrong file to the switch, and
by deleting the image file. In all these cases, the switch does not pass the power-on self-test (POST), and
there is no connectivity.
The 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.
Step 1 Connect a PC with terminal-emulation software supporting the XMODEM Protocol to the switch
console port.
Step 2 Set the line speed on the emulation software to 9600 baud.
Step 3 Disconnect the switch power cord.
Step 4 Reconnect the power cord to the switch.
The software image does not load. The switch starts in boot loader mode, which is indicated by the
switch:
Step 5 Use the boot loader to enter commands, and start the transfer.
switch: copy xmodem: flash:image_filename.bin
Step 6 When the XMODEM request appears, use the appropriate command on the terminal-emulation software
to start the transfer and to copy the software image to Flash memory.

Using Debug Commands

This section explains how you use debug commands to diagnose and resolve internetworking problems:
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•
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78-11380-04
prompt.
Enabling Debugging on a Specific Feature, page 26-12
Enabling All-System Diagnostics, page 26-12
Redirecting Debug and Error Message Output, page 26-13
Catalyst 2950 Desktop Switch Software Configuration Guide
Using Debug Commands
26-11