Hi,

I've one command and you can also try that. I use this to find out how long the switch port was down using the key word mentioned in the show interface .

SW-***-226#sh int fa3/0/12
FastEthernet3/0/12 is down, line protocol is down (notconnect)
  Hardware is Fast Ethernet, address is 001d.464b.1e8e (bia 001d.464b.1e8e)
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 10/100BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 6w6d, output 00:01:16, output hang never  ---- This switch port was down for 1 minute and 16 sec
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     251840614 packets input, 80100244231 bytes, 0 no buffer
     Received 373073 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     54245 input errors, 54243 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 154250 multicast, 0 pause input
     0 input packets with dribble condition detected
     422495720 packets output, 245309822100 bytes, 0 underruns
     0 output errors, 0 collisions, 3 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out
SW-****-226#

But once the port comes up the output 00:01:16 will set to 00:00:01 depends upon switching frames/time

Thanks,

ThiyaguVG.