I need to check what ports are in use on my 3550 Version 12.1(14)EA1a .
Could you tell me how to do it pls?
Basically you have to use two commands.
1)sh int counters ,which will provide data flow info on each interface ,you can clear counters on all ports.If you find any or many with 0, then go on that interface and issue .
2)sh int gigabitEthernet 0/X
and look for
" Last input never, output never, output hang never
Last clearing of "show interface" counters never " or something like that
"Last input never, output 23w2d, output hang never"
This will confirm that, How long that port has been used or not used at all .
Hopes this helps