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Catalyst 2900 Series XL and Catalyst 3500 SeriesXL Software Configuration Guide
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Chapter9 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.
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 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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