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BladeSystem - General
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MAC address flapping

Occasional Advisor

MAC address flapping

Hi All,

I am having some issue with my connectivity.

The setup is as below:

Server A NIC 1 -- VC 1 -- Switch A
NIC 2 -- VC 2 -- Switch A
Server B NIC 1 -- VC 1 -- Switch A
NIC 2 -- VC 2 -- Switch A

The VLAN configuration are done on individual NIC card on the servers and the switchport on Switch A facing the VC connect are all on trunk mode.

Currently I am seeing MAC address flapping on my Switch. The switches are CISCO 3750 and are being stacked so it appears logically as 1 switch.

Any idea what might be the problem?

Below is an output of the flapping on the switch.

%SW_MATM-4-MACFLAP_NOTIF: Host xxxx.xxxx.0637 in vlan 1 is flapping between port Gi2/0/3 and port Gi2/0/5

%SW_MATM-4-MACFLAP_NOTIF: Host xxxx.xxxx.46eb in vlan 1 is flapping between port Gi1/0/5 and port Gi1/0/7

%SW_MATM-4-MACFLAP_NOTIF: Host xxxx.xxxx.661d in vlan 1 is flapping between port Gi2/0/15 and port Gi2/0/7

Occasional Advisor

Re: MAC address flapping

Apparently the mac address are from the stacking link between the virtual connects.

How can I solve this?