Expert i need your help.find the attached file CAt OS 4500 version 6.3 using as core fiber connectivtybetween access swicthes 2950
Vlan 1 is running on ial switches
CAt OS moudue 3 few user are connected on modue 4 mostly servers are connected
access swicthes are 2950 where only user are connected following are the error
%SYS-4-pb-WARN:1/Host 00:0b:db:c2:18:53 is flapping between 3/1 and 4/7
%SYS-4-pb-WARN:1/Host 00:0a:b7:e7:6d:80 is flapping between 3/1 and 4/7
how can i resolve thius issue
kindly help me
Thanks Ryan this is extermey helpful to me .Spantree by default on Cisco Swithc Vlan is running accross network
load balanincg i did get can you elaborate more coz the mac address flapping are from Active directory.ISA server ,File server
did u find anythhing wrong in Network Diagram
Thanks again Ryan
Check out the teaming configuration at server level,genrally they used to configure in Active/Active mode.If yes then try configure in Active/Passive mode and then check the server ports should not flap in your switches.
Hope to Help !!
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I am guessing that you have the load balancing feature enabled.
If you don't need it you could just turn it off and it should resolve it, but incase you actually need to keep it on then you could configure a static IP to multicast mac address entry and turn on IGMP snooping or configure the multicast mac to the ports that are part of the load balancing group.
Another, less used solution, would be to change the mode from multicast to broadcast. It's obviously less used because it's not viable all the time.
If you are not using load balancing then the next question is "are you using spanning trees"?
Spanning tree is actually a more common cause. Spanning tree issues form during the learning phase and are a result of imporper "learning" of mac address'. If you have a spanning tree issue, or think you might, then check this link out: