06-19-2018 03:43 AM - edited 07-05-2021 08:45 AM
Hello, we have two WLC in different places and we see that we have mac-flapping between both sites.
In each site we have a port-channel in mode on, and the load-balancing method is src-dst-ip.
What could be the cause?
Site A: Primary WLC
Jun 19 12:28:33.069: %MAC_MOVE-SW1_SP-4-NOTIF: Host xxxxx in vlan xx is flapping between port Po15 and port Po71
Site B: Secondary WLC
Jun 19 12:28:25.679: %MAC_MOVE-4-NOTIF: Host xxxxx in vlan xx is flapping between port Po71 and port Po25
Po71 is the Po that connects with the WLC in each side, and Po15 and Po25 are the interconnections between both sites.
06-19-2018 06:44 AM
06-19-2018 06:58 AM
The WLC are in different places, its not possible to have roaming between them,
WLC are configured with SSO redundancy.
06-19-2018 07:49 AM
06-19-2018 07:55 AM
Yes, are in different locations and in different buildings, i dont see where its the problem, there is not any loop and only wlc1 its working like primary wlc. Why we see the mac flapping continuosly? in the events of the WLC we dont see any switchover.
Its seems like any client that connects into the network you can see the mac in wlc1 and in wlc2 during some time, if not i dont understand this situation.
06-19-2018 07:59 AM
06-19-2018 08:46 AM
Yes, I suppose that i need to open a case, the only problem is that we dont have log, because all the day this messages are fill all the log buffer.
Regards
06-19-2018 09:48 AM
06-19-2018 12:05 PM
Are any of the AP`s in flexconnect mode? I recently saw that same experience with a customer that was running Flexconnect. As the client roamed from one IDF to another, it generated mac flap notifications.
06-20-2018 01:18 AM
Only a few APs are in flexconnect mode, but the macs are not in these APs, so the problem happens to all the APs, not the flexconnect only.
Regards
06-20-2018 02:27 AM
06-20-2018 02:34 AM
Yes, if you see in the redundancy tap, you can see "SSO" in redundancy state
06-20-2018 02:36 AM
06-20-2018 03:27 AM
The normal situation is that one WLC is managing everything, so its not normal that you see these macs in the secondary WLC.
Because all the APs, SSIDs are in the primary WLC.
06-20-2018 04:10 AM
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