MAC Flap error on cisco 3750 switch

Unanswered Question
Apr 1st, 2009

Hi,

I got to see MaC flap error today on my cisco 3750 switch which took my siwtch offline for some time.

logs:-

01/04/2009 17:53

%SW_MATM-4-MACFLAP_NOTIF: Host 0800.0ef5.dac4 in vlan 2 is flapping between port Po4 and port Fa3/0/33

01/04/2009 17:53

%SW_MATM-4-MACFLAP_NOTIF: Host 0021.4a5e.4892 in vlan 5 is flapping between port Po4 and port Fa3/0/18

01/04/2009 17:53

%SW_MATM-4-MACFLAP_NOTIF: Host 0800.0e14.1b93 in vlan 2 is flapping between port Fa3/0/1 and port Po4

01/04/2009 17:56

%SW_MATM-4-MACFLAP_NOTIF: Host 0800.0e98.1c21 in vlan 5 is flapping between port Po4 and port Fa1/0/9

%SW_MATM-4-MACFLAP_NOTIF: Host 0800.0f24.1c31 in vlan 2 is flapping between port Po4 and port Fa1/0/46

%SW_MATM-4-MACFLAP_NOTIF: Host 0800.0e45.efe4 in vlan 2 is flapping between port Po4 and port Fa3/0/41

%SW_MATM-4-MACFLAP_NOTIF: Host 0800.0e56.1f1 in vlan 2 is flapping


Could anyone tell me what cause ths and what precaution do i need to take??


Thanks in advance.

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John Blakley Wed, 04/01/2009 - 09:07

Generally, this can happen when users are roaming from one wireless ap to another. Do you have APs connected to these ports?


HTH,

John

thotsaphon Wed, 04/01/2009 - 09:18

neha,

To make sure that PO4 is running well. What kind of device is connecting to PO4?

What type of interface are you using on the PO4? Fiber?



Toshi

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