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New Member

CRCs incrementing

Dear All,

Just a quick one, i've 380 CRC errors incremented on the interface between me and the ISP (in a period of 3hours)

Last clearing of "show interface" counters 03:18:41

  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 527000 bits/sec, 201 packets/sec

  5 minute output rate 445000 bits/sec, 199 packets/sec

     1622419 packets input, 533479907 bytes

     Received 276 broadcasts, 84 runts, 0 giants, 0 throttles

     384 input errors, 384 CRC, 0 frame, 0 overrun, 0 ignored

Is that normal or should be checked.

Thanks,

Fady

6 REPLIES

CRCs incrementing

It needs to be checked. You can try replacing the cable first to see if it helps. What type of connection is this? Serial? Ethernet?

HTH,
John

*** Please rate all useful posts ***

HTH, John *** Please rate all useful posts ***
New Member

CRCs incrementing

thanks John, this is an Ethernet connection.

Will try to change the cable and see.

Thanks again.

CRCs incrementing

Can you post your "show int "? I'm looking for something specific....

HTH,
John

*** Please rate all useful posts ***

HTH, John *** Please rate all useful posts ***
New Member

CRCs incrementing

FastEthernet0/0 is up, line protocol is up

  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 03:33:37

  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 517000 bits/sec, 201 packets/sec

  5 minute output rate 457000 bits/sec, 199 packets/sec

     1804975 packets input, 591659825 bytes

     Received 292 broadcasts, 90 runts, 0 giants, 0 throttles

     424 input errors, 424 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog

     0 input packets with dribble condition detected

     1802931 packets output, 517603366 bytes, 0 underruns

     0 output errors, 0 collisions, 0 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

CRCs incrementing

Thanks for posting this. Speed/duplex is correct. Usually, CRC errors are from mismatched duplex settings. How do you have your interface configured? Auto or hardcoded? If it's auto, you may try to change it to 100/full hardcoded. If it's hardcoded, you may try to change it to auto for speed/duplex. The provider could have their side at auto and you have yours hard coded. If that's the case, the other end could see half duplex and it could cause your crc errors.

HTH,
John

*** Please rate all useful posts ***

HTH, John *** Please rate all useful posts ***
New Member

CRCs incrementing

Hi John,

thanks for the useful info, honestly i don't know how it is configured as it was implemented back in the days before me.

Will try to check this and as well reach out to the provider and see what's on their side.

Thanks,

Fady

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