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 192.168.0.10 and the switch will use 192.168.0.1.

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

switch: set IP_ADDR 192.168.0.1/255.255.255.0
switch: set DEFAULT_ROUTER 192.168.0.10
switch: copy
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For some reason a Cisco ME3400 doesn’t have both IPv4 and IPv6 routing enabled. Still wondering why, but this is how you enable it:

 

conf t
sdm prefer dual-ipv4-and-ipv6 routing
exit
wr mem
reload
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