host flapping

Discussion in 'Cisco' started by nini, Nov 15, 2005.

  1. nini

    nini Guest

    in one of our server switches, a

    IOS (tm) Catalyst 4000 L3 Switch Software (cat4000-I9S-M), Version
    12.2(20)EWA, RELEASE SOFTWARE (fc1)

    System image file is "bootflash:cat4000-i9s-mz.122-20.EWA.bin"

    cisco WS-C4507R (MPC8245) processor (revision 7) with 524288K bytes of
    memory.

    we have this problem ;

    we have implemented load balancing between two server.
    I understand that the mac adress 02:01:00:00:00:00 is used by MS load
    balancing service.

    the problem is that there are 2 other servers which are also on load
    balancing, so twice the mac-adress on the switch.

    so we get this following message every 5 or 6 seconds...

    Nov 15 08:22:30 mon-ss-02 160771: Nov 15 09:22:29:
    %C4K_EBM-4-HOSTFLAPPING: Host 02:01:00:00:00:00 in vlan 403 is flapping
    between port Gi5/2 and port Gi 4/22
    these server must be on the same vlan, and the MS load balancing
    service is by default on the MCS 7800 series (for cisco call manager).

    is there a way to avoid this ??
    thanks.
     
    nini, Nov 15, 2005
    #1
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  2. The following articles may prove useful:

    MS Windows Load Balancing Server: Issues with Switching and Routing
    http://www.cisco.com/warp/public/473/ms_wlbs.html

    Configuration options for WLBS hosts connected to layer 2 switches
    http://support.microsoft.com/default.aspx?scid=kb;en-us;193602

    Regards,

    Aaron

    ---


    ~ in one of our server switches, a
    ~
    ~ IOS (tm) Catalyst 4000 L3 Switch Software (cat4000-I9S-M), Version
    ~ 12.2(20)EWA, RELEASE SOFTWARE (fc1)
    ~
    ~ System image file is "bootflash:cat4000-i9s-mz.122-20.EWA.bin"
    ~
    ~ cisco WS-C4507R (MPC8245) processor (revision 7) with 524288K bytes of
    ~ memory.
    ~
    ~ we have this problem ;
    ~
    ~ we have implemented load balancing between two server.
    ~ I understand that the mac adress 02:01:00:00:00:00 is used by MS load
    ~ balancing service.
    ~
    ~ the problem is that there are 2 other servers which are also on load
    ~ balancing, so twice the mac-adress on the switch.
    ~
    ~ so we get this following message every 5 or 6 seconds...
    ~
    ~ Nov 15 08:22:30 mon-ss-02 160771: Nov 15 09:22:29:
    ~ %C4K_EBM-4-HOSTFLAPPING: Host 02:01:00:00:00:00 in vlan 403 is flapping
    ~ between port Gi5/2 and port Gi 4/22
    ~ these server must be on the same vlan, and the MS load balancing
    ~ service is by default on the MCS 7800 series (for cisco call manager).
    ~
    ~ is there a way to avoid this ??
    ~ thanks.
     
    Aaron Leonard, Nov 15, 2005
    #2
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