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Catalyst 2940 Switch Software Configuration Guide
78-15507-02
Chapter26 Troubleshooting
Using 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 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.
Follow these steps to recover from corrupted software:
Step 1 Connect a PC with terminal-emulation software supporting the XMODEM protocol to the switch
console port.
For more information, refer to the “Connecting to the Console Port” and “Starting the Terminal
Emulation Software” sections of “Appendix D, Configuring the Switch with the CLI-Based Setup
Program” in the hardware installation guide.
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.
For more information, refer to the “Connecting to the Console Port” and “Starting the Terminal
Emulation Software” sections of “Appendix D, Configuring the Switch with the CLI-Based Setup
Program” in the hardware installation guide.
Note You can configure your switch for Telnet by following the procedure in the “Accessing the CLI”
section on page 2-9.
Step 2 Set the line speed on the emulation software to 9600 baud.
Step 3 Unplug the switch power cord.