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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter28 Troubleshooting
Using Recovery Procedures
Using Recovery Procedures
These recovery procedures require that you have physical access to the switch:
• Recovering from Corrupted Software, page 28-6
• Recovering from a Lost or Forgotten Password, page 28-6
• Recovering from a Command Switch Failure, page 28-8
• Recovering from Lost Member Connectivity, page 28-11
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 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 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# 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.
Recovering from a Lost or Forgotten Password
Follow these steps if you have forgotten or lost the switch password.
Step 1 Connect a terminal or PC with terminal emulation software to the console port. For more information,
refer to the switch hardware installation guide.
Note You can configure your switch for Telnet by following the procedure in the “Accessing the CLI”
section on page 2-10.
Step 2 Set the line speed on the emulation software to 9600 baud.