Collision detection in my WAN

Posted on 2011-05-08
Last Modified: 2012-05-11
There is a few time, my ISP told me that he noticed thath there are lot off collision in my wan network. As i see the cacti graph, every thing is fine in the bandwith. Some time, there are some pic but i identife the clients who are responsible.but the traffic is allowed. So i need help to how can i know that there are lot of collision. Is there a network monitor witch can help me ?
Question by:beke_josue
    LVL 7

    Expert Comment

    Look at the interface(s) of the router for CRC or input ouput erros

    Link to management software list

    Author Comment

    i have a cisco asa 5510, can you explain me the step ?
    LVL 7

    Expert Comment

    LVL 3

    Expert Comment

    If ethernet hand off, check the WAN interface, are you running full duplex?  If yes, i would have the ISP check their hand off for half duplex.  A fiber to copper transceiver could also not negotiate properly and negotiate to half duplex.

    Author Comment

    See below the show interface commande for my routeur. Can you confirme that there is not collision? Or can you give me an explicit interpretation?
    Interface Ethernet0/0 "x", is up, line protocol is up
      Hardware is i82546GB rev03, BW 1000 Mbps, DLY 10 usec
          Auto-Duplex(Full-duplex), Auto-Speed(1000 Mbps)
          MAC address 0023.5e25.4612, MTU 1500
          IP address 172.x.x.x, subnet mask x.x.x.x
          9070802038 packets input, 11664249371572 bytes, 0 no buffer
          Received 5 broadcasts, 0 runts, 0 giants
          11 input errors, 0 CRC, 0 frame, 11 overrun, 0 ignored, 0 abort
          0 L2 decode drops
          7863652186 packets output, 3158970316258 bytes, 0 underruns
          0 output errors, 0 collisions, 0 interface resets
          0 babbles, 0 late collisions, 0 deferred
          0 lost carrier, 0 no carrier
          input queue (curr/max packets): hardware (1/33) software (0/0)
          output queue (curr/max packets): hardware (0/84) software (0/0)
      Traffic Statistics for "MTL-INT":
          9070800587 packets input, 11498391870738 bytes
          7863652186 packets output, 2993833563110 bytes
          245673 packets dropped
          1 minute input rate 375 pkts/sec,  41602 bytes/sec
          1 minute output rate 1456 pkts/sec,  874366 bytes/sec
          1 minute drop rate, 0 pkts/sec
          5 minute input rate 415 pkts/sec,  65137 bytes/sec
          5 minute output rate 1457 pkts/sec,  843084 bytes/sec
          5 minute drop rate, 0 pkts/sec
    LVL 3

    Accepted Solution

    Nothing out of the ordinary.  Since you are charting bandwidth and have snmp set up, you could use a SNMP monitor to record interface errors, etc.   Try but there are many more out there.

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