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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
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Chapter 9 Troubleshooting
Recovery Procedures
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 following 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 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 Unplug 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: prompt.
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.
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