Every once and a while you have to replace a supervisor card. The issue then is what code is on the old supervisor and do you (or can you) upgrade the code before using it. One think you have to remember is that different versions of code support different line cards so that old version of code may not support your newer cards.
The other issue (and I am going to do a script for this) is that ports default to admin down and no shut does NOT appear in the config only shutdown. So now you have to figure what ports and vlans were up before the sup swap and bring them up. I will do a perl script to read a config and insert a no shut command on any interface that does not have a shutdown in the config.
Of course getting a sho int brief before and after and doing a windiff goes a way to ensure that you are back to where you were.
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