Next: VPN site-to-site betweem Cisco 1841 and SonicWall 170
From: nini on 15 Nov 2005 02:45
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.

From: Aaron Leonard on 15 Nov 2005 14:23
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.

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