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Sat, Jun 17, 2017 8:02 pm

Clearing the counters for a port on a Cisco switch

You can view the counters for a port on a Cisco switch using the show interfaces command. E.g., if I want to check on whether cyclic redundancy check (CRC) errors have been occurring on port fa0/16, I can issue the command shown below:

Huron>show interfaces fa0/16
FastEthernet0/16 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 0009.e897.d290 (bia 0009.e897.d290)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 19/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 10Mb/s, media type is 100BaseTX
  input flow-control is unsupported output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:00, output hang never
  Last clearing of "show interface" counters 2d17h
  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 24000 bits/sec, 40 packets/sec
  5 minute output rate 756000 bits/sec, 64 packets/sec
     46168 packets input, 4608074 bytes, 0 no buffer
     Received 1250 broadcasts (1161 multicast)
     0 runts, 0 giants, 0 throttles
     121 input errors, 16 CRC, 105 frame, 0 overrun, 0 ignored
     0 watchdog, 1161 multicast, 0 pause input
     0 input packets with dribble condition detected
     255151 packets output, 119141892 bytes, 0 underruns
     0 output errors, 0 collisions, 0 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
Huron>

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