Catalyst 3000 - Last input & Last output

[uppermost]

I am trying to determine the interfaces

1. that have never been used since the switch was powered on

1. that have not been used for some time, for example for more than 30weeks.

Initially, I thought I can accomplish this by looking at Last Input & Last output values however I am not sure if its because of some bug or because fast switching is enabled but I am seeing so many interfaces where it does not make sense to me... 

For example, following interfaces should be down according to input & output values, but they are up

GigabitEthernet3/0/43 is up, line protocol is up (connected)
Last input 28w3d, output never, output hang never

GigabitEthernet3/0/23 is up, line protocol is up (connected)
Last input never, output 00:00:00, output hang never

GigabitEthernet3/0/16 is up, line protocol is up (connected)
Last input never, output 5w3d, output hang never

Is there another way to determine interfaces that have not been used for more than 6months  ?

[Reza Sharifi]

Hard to tell with command line. You can always use switchmap to figure out how long the ports have not been used.

https://sourceforge.net/projects/switchmap/

HTH

[MHM Cisco World]

show platform pm interface-flaps <<- this keyword can give you some detail about the interface UP/Down if it support in Cat3000 it support in Cat9000

[Leo Laohoo]

All the examples above means the servers have misconfigured NICs.  It is telling me Layer 1 and Layer 2 are up/up but the NICs are not sending data out which, again, points the NICs are misconfigured (by the operator or the manufacturer).