11-30-2022 01:41 PM
I have my switches connected as follows.
But I've seen these logs (both on port-channels and interfaces) on both core and access.
Logs CORE
*Nov 29 15:41:05.226: %SW_MATM-4-MACFLAP_NOTIF: Host 827d.bb89.a409 in vlan 82 is flapping between port Po13 and port Po12
*Nov 29 15:41:52.325: %SW_MATM-4-MACFLAP_NOTIF: Host 827d.bb89.a409 in vlan 82 is flapping between port Po13 and port Po12
*Nov 29 15:42:48.384: %SW_MATM-4-MACFLAP_NOTIF: Host ca66.4352.a19c in vlan 82 is flapping between port Po10 and port Po13
*Nov 29 15:42:50.432: %SW_MATM-4-MACFLAP_NOTIF: Host 827d.bb89.a409 in vlan 82 is flapping between port Po12 and port Po13
*Nov 29 15:43:16.832: %SW_MATM-4-MACFLAP_NOTIF: Host ca66.4352.a19c in vlan 82 is flapping between port Po10 and port Po12
*Nov 29 15:44:03.633: %SW_MATM-4-MACFLAP_NOTIF: Host 827d.bb89.a409 in vlan 82 is flapping between port Po13 and port Po12
*Nov 29 16:02:35.558: %SW_MATM-4-MACFLAP_NOTIF: Host 827d.bb89.a409 in vlan 82 is flapping between port Po12 and port Po13
*Nov 29 16:38:15.743: %SW_MATM-4-MACFLAP_NOTIF: Host 4aa3.5a95.f9f0 in vlan 82 is flapping between port Po13 and port Po10
*Nov 29 16:39:37.420: %SW_MATM-4-MACFLAP_NOTIF: Host 4aa3.5a95.f9f0 in vlan 82 is flapping between port Po10 and port Po12
*Nov 29 16:42:30.999: %SW_MATM-4-MACFLAP_NOTIF: Host ca66.4352.a19c in vlan 82 is flapping between port Po12 and port Po13
Logs Access
Nov 29 12:46:41.212: %SW_MATM-4-MACFLAP_NOTIF: Host 4aa3.5a95.f9f0 in vlan 82 is flapping between port Po1 and port Gi1/0/45
Nov 29 12:48:01.659: %SW_MATM-4-MACFLAP_NOTIF: Host 4aa3.5a95.f9f0 in vlan 82 is flapping between port Gi1/0/45 and port Gi1/0/48
Nov 29 12:51:30.979: %SW_MATM-4-MACFLAP_NOTIF: Host 8ed6.f69e.0f93 in vlan 82 is flapping between port Gi1/0/45 and port Gi1/0/43
Nov 29 12:52:02.059: %SW_MATM-4-MACFLAP_NOTIF: Host ea14.b885.f58b in vlan 82 is flapping between port Gi1/0/48 and port Gi1/0/45
Nov 29 13:04:48.998: %SW_MATM-4-MACFLAP_NOTIF: Host 6ace.c223.039f in vlan 82 is flapping between port Gi1/0/45 and port Gi1/0/43
Nov 29 13:08:19.377: %SW_MATM-4-MACFLAP_NOTIF: Host ca66.4352.a19c in vlan 82 is flapping between port Gi1/0/45 and port Po1
Nov 29 13:10:50.054: %SW_MATM-4-MACFLAP_NOTIF: Host ca66.4352.a19c in vlan 82 is flapping between port Gi1/0/45 and port Po1
Nov 29 13:12:44.975: %SW_MATM-4-MACFLAP_NOTIF: Host ca66.4352.a19c in vlan 82 is flapping between port Po1 and port Gi1/0/45
Nov 29 13:13:02.738: %SW_MATM-4-MACFLAP_NOTIF: Host ca66.4352.a19c in vlan 82 is flapping between port Gi1/0/45 and port Po1
Nov 29 13:13:16.935: %SW_MATM-4-MACFLAP_NOTIF: Host ca66.4352.a19c in vlan 82 is flapping between port Gi1/0/45 and port Po1
Nov 29 13:13:31.095: %SW_MATM-4-MACFLAP_NOTIF: Host ca66.4352.a19c in vlan 82 is flapping between port Po1 and port Gi1/0/45
Nov 29 13:13:47.550: %SW_MATM-4-MACFLAP_NOTIF: Host ca66.4352.a19c in vlan 82 is flapping between port Gi1/0/45 and port Po1
Nov 29 13:15:01.793: %SW_MATM-4-MACFLAP_NOTIF: Host ca66.4352.a19c in vlan 82 is flapping between port Gi1/0/45 and port Po1
Nov 29 13:17:04.952: %SW_MATM-4-MACFLAP_NOTIF: Host 8ed6.f69e.0f93 in vlan 82 is flapping between port Gi1/0/45 and port Gi1/0/43
Nov 29 13:20:43.311: %SW_MATM-4-MACFLAP_NOTIF: Host ee64.6891.49ff in vlan 82 is flapping between port Po1 and port Gi1/0/48
Are the configuration of my port-channels and interfaces ok?
11-30-2022 07:17 PM - edited 11-30-2022 07:17 PM
Hello
Looking at your posted topology it suggests possible WLAN clients are roaming, Moving from an access-point on say switch X/switchport Gi1/0/45 then moving to a different access-point located on say switchY via PO1, However given the default mac-address table aging timers(300 sec) applied to cisco switches they are reporting that the same mac-address is seen on differing switch/switchports
11-30-2022 08:21 PM
Should I make any changes to the timers???
The flapping is happening on VLAN 82 (it's the guest VLAN), shouldn't you also see flapping with other VLANs of some other SSID???
12-01-2022 12:15 AM
Hello
If the above logging doesnt relate to any wlan clients, than disable port Gi1/0/45 on the access switch and see if the flapping stops, as it may also suggest you have a loop.
12-01-2022 03:41 AM
I have suggest you can if the mac address appear is for wireless to disable mac notification.
this will remove any mac flapping notification for that host.
it is suggestion.
thanks
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