Mac address flapping issue

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Apr 10th, 2010
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I am seeing mac address flapping on my 2960 switch. I entered a static mac address table entry, but that did not resolve the issue. The flapping still continues. And when I do a sh mac address-table command, I see that both a static entry and a dynamic entry exist for that address. I am running 12.2(35)SE5. How can I resolve this issue? Thanks.

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Ganesh Hariharan Sun, 04/11/2010 - 22:25
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I am seeing mac address flapping on my 2960 switch. I entered a static
mac address table entry, but that did not resolve the issue. The
flapping still continues. And when I do a sh mac address-table command,
I see that both a static entry and a dynamic entry exist for that
address. I am running 12.2(35)SE5. How can I resolve this issue? Thanks.

Hi,


Mac-address flapping issue can come from host/server end,just check out the following things from server/host end that both the NIC are connected to different swiches and are in ACTIVE/PASSIVE fashion from server/host end.If both the nic are configured in Active/Active fashion then there will be mac flapping messages can come on switches.In order to troubleshoot just check the serve end configuration of NIC and try with Active/Passive mode from server end for load balancing.


Hope to Help !!


Ganesh.H


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