router#show interfaces имя_интерфейса

router#show interfaces Serial0/2/0:1
Serial0/2/0:1 is up, line protocol is up 
  Hardware is GT96K Serial
  Description: Connection to RTKOMM
  Internet address is aaa.bbb.ccc.ddd/30
  MTU 1500 bytes, BW 1984 Kbit, DLY 20000 usec, 
     reliability 255/255, txload 172/255, rxload 138/255
  Encapsulation HDLC, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:02, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 66988
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/18140 (size/max total/threshold/drops) 
     Conversations 0/56/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1488 kilobits/sec
  5 minute input rate 1076000 bits/sec, 396 packets/sec
  5 minute output rate 1346000 bits/sec, 427 packets/sec
     60166148 packets input, 2314071408 bytes, 0 no buffer
     Received 76584 broadcasts, 0 runts, 0 giants, 0 throttles
     131 input errors, 73 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     67378787 packets output, 2369449998 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     1 carrier transitions
  Timeslot(s) Used:1-31, SCC: 0, Transmitter delay is 0 flags

router#clear counters имя_интерфейса

router#clear counters Serial0/2/0:1
Clear "show interface" counters on this interface [confirm]
router#show interfaces Serial0/2/0:1
Serial0/2/0:1 is up, line protocol is up 
  Hardware is GT96K Serial
  Description: Connection to RTKOMM
  Internet address is aaa.bbb.ccc.ddd/30
  MTU 1500 bytes, BW 1984 Kbit, DLY 20000 usec, 
     reliability 255/255, txload 166/255, rxload 129/255
  Encapsulation HDLC, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:11, output 00:00:06, output hang never
  Last clearing of "show interface" counters 00:00:52
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 17
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops) 
     Conversations 0/56/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1488 kilobits/sec
  5 minute input rate 1007000 bits/sec, 338 packets/sec
  5 minute output rate 1293000 bits/sec, 370 packets/sec
     15584 packets input, 5961460 bytes, 0 no buffer
     Received 5 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     17684 packets output, 7902114 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
  Timeslot(s) Used:1-31, SCC: 0, Transmitter delay is 0 flags