Cisco switch error

[TecaproIT.cisco]

Hi everybody,

The my problem is MACFLAP_NOTIF  ... Several mac addresses are being flapped between portchannels pretty consistantly. Some output is shown below:

Jul 15 12:48:15.538: %SW_MATM-4-MACFLAP_NOTIF: Host a493.4cd4.7f3f in vlan 1 is flapping between port Gi1/0/44 and port Gi1/0/49

Can you help me?

[Mark Malone · Accepted solution]

the mac address being learnt on 44 is 544a.0037.0ee8 and is an access port

what is this mac address a493.4cd4.7f3f what does it belong to when you trace to it use command below , its being learnt through the trunk so you can check the next directly connected switch see if its homed there

show mac address-table address x.x.x

also whats connected to the port 17 its receiving bpdus but its set as an access port and having stp issues

run this command you can trace whee your stp changes are occurring from

show spanning-tree de | i ieee|occurr|from| is exec

[Madhukrishnan Gopinathan Nair]

The mac seems to be of a Cisco device. Please trace the mac from both ports and check where is it getting dual homed, This indicates a loop.