Vlan flapping for different MAC(AP ports)

[meshekar51]

Hi all,

I need help here, from between AP ports and between up link to AP ports for example port Gi2/0/45 and port Gi1/0/23 vlan 993 is flapping 

%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac8.7783 in vlan 993 is flapping between port Gi2/0/45 and port Gi1/0/23
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac8.7783 in vlan 993 is flapping between port Gi2/0/45 and port Gi1/0/23
%SW_MATM-4-MACFLAP_NOTIF: Host 5076.afd6.9232 in vlan 993 is flapping between port Gi1/1/1 and port Gi2/0/45
%SW_MATM-4-MACFLAP_NOTIF: Host 5076.afd6.9232 in vlan 993 is flapping between port Gi1/1/1 and port Gi2/0/45
%SW_MATM-4-MACFLAP_NOTIF: Host d8f2.ca55.3caa in vlan 993 is flapping between port Gi1/0/23 and port Gi2/0/45
%SW_MATM-4-MACFLAP_NOTIF: Host d8f2.ca55.3caa in vlan 993 is flapping between port Gi1/0/23 and port Gi2/0/45
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac8.7468 in vlan 993 is flapping between port Gi1/0/23 and port Gi2/0/47
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac8.7468 in vlan 993 is flapping between port Gi1/0/23 and port Gi2/0/47
%SW_MATM-4-MACFLAP_NOTIF: Host 8630.c3cf.d9eb in vlan 993 is flapping between port Gi2/0/45 and port Gi1/0/23
%SW_MATM-4-MACFLAP_NOTIF: Host 8630.c3cf.d9eb in vlan 993 is flapping between port Gi2/0/45 and port Gi1/0/23
%SW_MATM-4-MACFLAP_NOTIF: Host 982c.bc4c.331c in vlan 993 is flapping between port Gi2/0/45 and port Gi1/1/1
%SW_MATM-4-MACFLAP_NOTIF: Host 982c.bc4c.331c in vlan 993 is flapping between port Gi2/0/45 and port Gi1/1/1
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac8.75b2 in vlan 993 is flapping between port Gi1/0/23 and port Gi1/1/1
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac8.75b2 in vlan 993 is flapping between port Gi1/0/23 and port Gi1/1/1
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac7.90f7 in vlan 993 is flapping between port Gi1/0/10 and port Gi2/0/47
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac7.90f7 in vlan 993 is flapping between port Gi1/0/10 and port Gi2/0/47
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac5.065c in vlan 993 is flapping between port Gi1/0/23 and port Gi1/1/1
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac5.065c in vlan 993 is flapping between port Gi1/0/23 and port Gi1/1/1
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac8.5c17 in vlan 993 is flapping between port Gi1/1/1 and port Gi1/0/23
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac8.5c17 in vlan 993 is flapping between port Gi1/1/1 and port Gi1/0/23
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac4.ad4c in vlan 993 is flapping between port Gi1/0/10 and port Gi2/0/45
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac4.ad4c in vlan 993 is flapping between port Gi1/0/10 and port Gi2/0/45
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac8.77c9 in vlan 993 is flapping between port Gi1/0/4 and port Gi2/0/47
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac4.ad51 in vlan 993 is flapping between port Gi1/0/10 and port Gi1/1/1
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac4.ad51 in vlan 993 is flapping between port Gi1/0/10 and port Gi1/1/1
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac8.756c in vlan 993 is flapping between port Gi2/0/45 and port Gi1/0/23
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac8.756c in vlan 993 is flapping between port Gi2/0/45 and port Gi1/0/23
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.ea8b.0c13 in vlan 993 is flapping between port Gi2/0/47 and port Gi1/0/23
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.ea8b.0c13 in vlan 993 is flapping between port Gi2/0/47 and port Gi1/0/23
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac6.5f07 in vlan 993 is flapping between port Gi2/0/47 and port Gi1/0/10
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac6.5f07 in vlan 993 is flapping between port Gi2/0/47 and port Gi1/0/10
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac7.9273 in vlan 993 is flapping between port Gi1/0/23 and port Gi2/0/47
%SW_MATM-4-MACFLAP_NOTIF: Host 181d.eac7.9273 in vlan 993 is flapping between port Gi1/0/23 and port Gi2/0/47

[marce1000]

 - The VLAN is not flapping but MAC's ; perhaps due to roaming between the AP's. I tend to think this is harmless.

 M.

[meshekar51]

Thank you,

Is any way to stop these logs roaming between the AP's..

[marce1000]

 - You could have a look at the 'logging discriminator' commands in IOS to suppress particular types of syslog messages (google for practical examples (e.g.)).

 M.

[Seb Rupik]

Hi there,

What is the purpose of VLAN993 and what do all of the fixed ports (ie gi1/0/1-48 and not gi1/1/1-4) have in common, what are they connected to?

cheers,

Seb.

[meshekar51]

Hi Seb,

G1/1/1 is uplink towards core switch, rest all are AP connected ports.

993 is wireless Vlan

Thanks

[luis_cordova]

Hi @meshekar51 

Check if this discussion can help you:

https://community.cisco.com/t5/switching/mac-flapping-however-the-mac-belongs-to-the-switch-interface/td-p/3823626

Regards