Cat 4003 issue

Discussion in 'Cisco' started by Alex Turtois, Jun 21, 2006.

  1. Alex Turtois

    Alex Turtois Guest

    HI All,

    Can anyone tell me please what does the following mean?

    %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is flapping between port 2/45
    2/46 and port 2/4
    %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is flapping between port 2/47
    2/48 and port 2/4
    %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is flapping between port 2/45
    2/46 and port 2/4
    %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is flapping between port 2/47
    2/48 and port 2/4
    %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is flapping between port 2/45
    2/46 and port 2/4

    Thanks,
    Alex
     
    Alex Turtois, Jun 21, 2006
    #1
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  2. Alex Turtois

    SAto Guest

    Alex Turtois skrev:
    > HI All,
    >
    > Can anyone tell me please what does the following mean?
    >
    > %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is flapping between port 2/45
    > 2/46 and port 2/4
    > %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is flapping between port 2/47
    > 2/48 and port 2/4
    > %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is flapping between port 2/45
    > 2/46 and port 2/4
    > %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is flapping between port 2/47
    > 2/48 and port 2/4
    > %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is flapping between port 2/45
    > 2/46 and port 2/4


    The flapping message means that the switch sees the host mac address
    change from port 2/45 -> 2/46 -> 2/4 and back. When this happens often
    the mac-address table ont he switch is "thrashed". Its may be causing
    the packets destined for the mac address in question to be broadcasted
    to alle ports on the switch instead.

    The mac address in question is used by Windows 2000 Advanced server
    with Network Load Balancing.

    To fix this, you could either turn off the load balancing feature.
    (which is not really network load balancing but server load balancing)
    Or configure a static IP -> multicast mac address entry and turn on
    igmp snooping or configure the multicast mac address to the ports which
    are members of the load balancing group.

    Im guessing there are seperate servers connected to the diffirent ports
    but that all of them are members of the load balancing group.

    Another way to "fix" this would be to change the mode from multicast to
    broadcast.
    But then all traffic would be broadcastet to every host on the network.

    Microsoft has made some documentation on how to do this on cisco
    switches.
    Cant remember a url, but a search on microsoft.com should give you some
    results.

    Hope this is helpful.

    -SAto
     
    SAto, Jun 22, 2006
    #2
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  3. Alex Turtois

    Alex Turtois Guest

    Sato,

    thanks a lot, that really helped.

    Alex


    SAto írta:
    > Alex Turtois skrev:
    > > HI All,
    > >
    > > Can anyone tell me please what does the following mean?
    > >
    > > %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is flapping between port 2/45
    > > 2/46 and port 2/4
    > > %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is flapping between port 2/47
    > > 2/48 and port 2/4
    > > %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is flapping between port 2/45
    > > 2/46 and port 2/4
    > > %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is flapping between port 2/47
    > > 2/48 and port 2/4
    > > %SYS-4-P2_WARN: 1/Host 02:01:00:00:00:00 is flapping between port 2/45
    > > 2/46 and port 2/4

    >
    > The flapping message means that the switch sees the host mac address
    > change from port 2/45 -> 2/46 -> 2/4 and back. When this happens often
    > the mac-address table ont he switch is "thrashed". Its may be causing
    > the packets destined for the mac address in question to be broadcasted
    > to alle ports on the switch instead.
    >
    > The mac address in question is used by Windows 2000 Advanced server
    > with Network Load Balancing.
    >
    > To fix this, you could either turn off the load balancing feature.
    > (which is not really network load balancing but server load balancing)
    > Or configure a static IP -> multicast mac address entry and turn on
    > igmp snooping or configure the multicast mac address to the ports which
    > are members of the load balancing group.
    >
    > Im guessing there are seperate servers connected to the diffirent ports
    > but that all of them are members of the load balancing group.
    >
    > Another way to "fix" this would be to change the mode from multicast to
    > broadcast.
    > But then all traffic would be broadcastet to every host on the network.
    >
    > Microsoft has made some documentation on how to do this on cisco
    > switches.
    > Cant remember a url, but a search on microsoft.com should give you some
    > results.
    >
    > Hope this is helpful.
    >
    > -SAto
     
    Alex Turtois, Jun 23, 2006
    #3
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