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Interface error

Please what is the possible cause and solution of this interface error.

BB1#show int fa0/1

FastEthernet0/1 is up, line protocol is up

  Hardware is Gt96k FE, address is 0007.0e3c.f957 (bia 0007.0e3c.f957)

  Description: *****WAN CONNECTION *****

  Internet address is xx.xx.xx.xx/29

  MTU 1500 bytes, BW 100000 Kbit/sec, 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, 100BaseTX/FX

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:00, output 00:00:00, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/4/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 277000 bits/sec, 120 packets/sec

  5 minute output rate 149000 bits/sec, 140 packets/sec

     2615122 packets input, 739484174 bytes

     Received 957 broadcasts, 246 runts, 0 giants, 0 throttles

     5994 input errors, 5994 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog

     0 input packets with dribble condition detected

     2843074 packets output, 371490795 bytes, 0 underruns

     0 output errors, 0 collisions, 3 interface resets

     0 unknown protocol drops

     0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier

     0 output buffer failures, 0 output buffers swapped out

Hall of Fame Super Bronze

Re: Interface error

Hall of Fame Super Gold

Re: Interface error

The command "sh controller ethernet F0/1" will give you a detailed information about the line errors.

Hall of Fame Super Gold

Re: Interface error

Chances are, the other device is set to half-duplex.