Flapping host on 4912G

Discussion in 'Cisco' started by mike@nacstock.ac.uk, May 26, 2005.

  1. Guest

    Hi Folks

    Can anyone point me in the right direction to start troubleshooting the
    messages below from our 4912G switch.

    Cheers

    Mike

    2005 May 26 04:56:58 %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is
    flapping between port
    2/12 and port 2/1
    2005 May 26 04:57:08 %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is
    flapping between port
    2/12 and port 2/1
    2005 May 26 04:57:28 %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is
    flapping between port
    2/12 and port 2/1
    2005 May 26 04:57:38 %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is
    flapping between port
    2/12 and port 2/1
    , May 26, 2005
    #1
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  2. Guest

    Solved I think - the MAC address 02:01:00:00:00:00 is a virtual MAC
    address used by the Windows network load balancing service for
    broadcasts. We're checking our server boxes to see which ones have this
    enabled.

    Cheers

    Mike
    , May 27, 2005
    #2
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