I had a corrupted IOS image on a 3750E switch today and feared for a xmodem transfer to eat up my day, until I found that you can copy from TFTP. It’s very well hidden, but still possible. Here’s how:

When the switch has ‘booted’ without a proper IOS, you’ll be in the ‘switch: ‘ command line. In the following example, I will assume that the TFTP server has IP and the switch will use

Connect your TFTP server to the ethernet management port, then follow this sequence:

switch: set IP_ADDR
switch: set DEFAULT_ROUTER
switch: copy tftp:// flash:IOS_image_file_name.bin
switch: set BOOT flash:IOS_image_file_name.bin
switch: boot

That should do it.

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