you should have a good idea of your network topology in order to do this. issue a showmac-address-table address of each host that were flapping based on your syslogs. Try to disable them manually or do a shutdown on the interface connected to it. This might be due to several things. one of them is a virus attack or someone connected a host which shouldn't be allowed, based on port security violation you had on your syslog.
This can also happen when you have wireless access points and the client is roaming between them. Make sure that you're not overly redundant on your switches because I just went through this. After cleaning up, I don't see flapping at all.
We had multiple redundant links between switches, and then the servers were connected to each switch. It was a mess. I removed many of the links and left only two.
Do you have all of your SSIDs in the same VLANs across the ports? In other words, do you have it like:
guest - vlan 100
secured - vlan 105
If that's the case, and the access points are all configured this way, you shouldn't see a flapping I wouldn't think. I would verify that it's an access point in these ports that are flapping, and then work backwards from there.
We are also having simmiler issue. WiFi users MAC moving between different Wireless controllers (as different APs registered on different controller) causing High CPU on 4506 switch (where WiFi VLANs created & Controllers are connected) nearly 98% .
it can also happen, if there is a hub, and a user connect both end of hub with cisco switch. thats what happened to us few times, and currently , i am looking for a solution, any thoughts to avoid my partocular case?
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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