Mac address flapping across wireless network

[iniestha.aung]

Hi  Everyone, 

Greeting!

Can anyone suggest why mac address are flapping across wireless ?

Please see the logs below. 

SW1(config)#do sho int des
Interface Status Protocol Description
Vl1 up up "Management_Vlan"
Fa0 admin down down
Gi1/0/1 up up AP
Gi1/0/2 up up AP
Gi1/0/3 up up AP
Gi1/0/4 up up AP
Gi1/0/5 up up AP
Gi1/0/6 up up AP
Gi1/0/7 up up AP
Gi1/0/8 up up AP
Gi1/0/9 up up AP
Gi1/0/10 up up AP
Gi1/0/11 up up AP
Gi1/0/12 up up AP
Gi1/0/13 down down AP
Gi1/0/14 down down AP
Gi1/0/15 down down AP
Gi1/0/16 down down AP
Gi1/0/17 down down AP
Gi1/0/18 down down AP
Gi1/0/19 down down AP
Gi1/0/20 down down AP
Gi1/0/21 down down AP
Gi1/0/22 down down AP
Gi1/0/23 down down AP
Gi1/0/24 up up Uplink-to-Router
Gi1/0/25 down down
Gi1/0/26 down down
Gi1/0/27 down down
Gi1/0/28 down down
SW1(config)#

=========================

001812: Mar 6 2022 08:58:40.476 SGT: %SW_MATM-4-MACFLAP_NOTIF: Host a2ff.13c8.ebf3 in vlan 3 is flapping between port Gi1/0/7 and port Gi1/0/1
001813: Mar 6 2022 17:57:06.454 SGT: %SW_MATM-4-MACFLAP_NOTIF: Host 1292.2d61.8fe2 in vlan 3 is flapping between port Gi1/0/12 and port Gi1/0/11
001814: Mar 6 2022 19:55:52.733 SGT: %SW_MATM-4-MACFLAP_NOTIF: Host a2ff.13c8.ebf3 in vlan 3 is flapping between port Gi1/0/1 and port Gi1/0/12
001815: Mar 7 2022 07:31:28.838 SGT: %SW_MATM-4-MACFLAP_NOTIF: Host ced2.42ed.b478 in vlan 3 is flapping between port Gi1/0/8 and port Gi1/0/7
001816: Mar 7 2022 17:02:19.607 SGT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/10, changed state to down
001817: Mar 7 2022 17:02:20.606 SGT: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/10, changed state to down
001818: Mar 7 2022 17:02:28.964 SGT: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/10, changed state to up
001819: Mar 7 2022 17:02:30.966 SGT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/10, changed state to up
001820: Mar 7 2022 17:03:30.976 SGT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/10, changed state to down
001821: Mar 7 2022 17:03:31.980 SGT: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/10, changed state to down
001822: Mar 7 2022 17:03:34.660 SGT: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/10, changed state to up
001823: Mar 7 2022 17:03:36.667 SGT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/10, changed state to up
001824: Mar 8 2022 07:35:25.972 SGT: %SW_MATM-4-MACFLAP_NOTIF: Host ced2.42ed.b478 in vlan 3 is flapping between port Gi1/0/10 and port Gi1/0/8
001825: Mar 9 2022 08:18:17.522 SGT: %SW_MATM-4-MACFLAP_NOTIF: Host 1292.2d61.8fe2 in vlan 3 is flapping between port Gi1/0/8 and port Gi1/0/7
001826: Mar 10 2022 07:34:06.339 SGT: %SW_MATM-4-MACFLAP_NOTIF: Host a2ff.13c8.ebf3 in vlan 3 is flapping between port Gi1/0/5 and port Gi1/0/2
001827: Mar 10 2022 07:52:19.735 SGT: %SW_MATM-4-MACFLAP_NOTIF: Host f60f.b045.6aae in vlan 3 is flapping between port Gi1/0/1 and port Gi1/0/3
001828: Mar 10 2022 13:16:55.107 SGT: %SW_MATM-4-MACFLAP_NOTIF: Host a2ff.13c8.ebf3 in vlan 3 is flapping between port Gi1/0/3 and port Gi1/0/2
001829: Mar 10 2022 19:47:48.867 SGT: %SW_MATM-4-MACFLAP_NOTIF: Host 16f2.7d12.b09c in vlan 3 is flapping between port Gi1/0/3 and port Gi1/0/4
001830: Mar 10 2022 23:41:38.960 SGT: %SW_MATM-4-MACFLAP_NOTIF: Host 8a28.7f95.424a in vlan 3 is flapping between port Gi1/0/6 and port Gi1/0/5
001831: Mar 11 2022 18:16:45.883 SGT: %SW_MATM-4-MACFLAP_NOTIF: Host a2ff.13c8.ebf3 in vlan 3 is flapping between port Gi1/0/12 and port Gi1/0/11
001832: Mar 12 2022 05:36:11.814 SGT: %SW_MATM-4-MACFLAP_NOTIF: Host a2ff.13c8.ebf3 in vlan 3 is flapping between port Gi1/0/3 and port Gi1/0/4
001833: Mar 12 2022 07:28:36.370 SGT: %SW_MATM-4-MACFLAP_NOTIF: Host a2ff.13c8.ebf3 in vlan 3 is flapping between port Gi1/0/1 and port Gi1/0/2
001834: Mar 12 2022 12:48:45.334 SGT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/2, changed state to down
001835: Mar 12 2022 12:48:46.340 SGT: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/2, changed state to down
001836: Mar 12 2022 12:48:54.733 SGT: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/2, changed state to up
001837: Mar 12 2022 12:48:56.735 SGT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/2, changed state to up
001838: Mar 12 2022 12:49:58.115 SGT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/2, changed state to down

SW1(config)# do sho ver
Cisco IOS Software, C2960X Software (C2960X-UNIVERSALK9-M), Version 15.2(4)E7, RELEASE SOFTWARE (fc2

[iniestha.aung]

This is one of the port(AP) configuration . 

SW1(config)#do sho run int g1/0/1
Building configuration...

Current configuration : 112 bytes
!
interface GigabitEthernet1/0/1
description AP
switchport trunk allowed vlan 1-3
switchport mode trunk
end

[marce1000 · Accepted solution]

        - These messages can usually be ignored. It happens when the client is roaming between access points.

 M.

[iniestha.aung]

Thanks Marce for the answer .

[Mohsin Alam · Accepted solution]

This will be expected if the wireless user is roaming around and will lead to mac flap i.e. learning of MAC on different ports. You can create a logging discriminator to ignore this. 

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[iniestha.aung]

Thanks Mohsiala for the answer.