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Cisco show command explained

From Ever changing code

show interfaces

Switch#show interfaces 
FastEthernet0/1 is down, line protocol is down (disabled)
  Hardware is Lance, address is 0001.9737.0101 (bia 0001.9737.0101)
 BW 100000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Half-duplex, 100Mb/s
  input flow-control is off, output flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:08, output 00:00:05, output hang never
  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
     956 packets input, 193351 bytes, 0 no buffer
     Received 956 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     2357 packets output, 263570 bytes, 0 underruns
     0 output errors, 0 collisions, 10 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
  • Input Errors - total number of errors, includes runts, giants, no buffer, CRC, frame, overrun and ignored counts
  • Runts - discarded packets smaller then protocol allowed, eg. Ethernet frame smaller than 64 bytes
  • Giants - discarded packets exceeded protocol allowed size, eg. Ethernet frame grater than 1518 bytes
  • CRC - when calculated checksum is not the same as received
  • Output Errors - errors that prevented the final transmission of datagrams out of the interface that is being examined
  • Collisions - number of frames retransmitted due to Ethernet collisions
  • Late Collisions - a collision that occur after 512 bits of the frame have been transmitted