Thanks, I had seen that. The trouble is determining which of the 48 clients on the 3548 edge switch is giving this error. It only seems to happen at random times. Its not hurting the network but I hate to see the errors in the logs!! Maybe I am just too picky.
Whenever you receive the error on the 4006 switch, go to 3548 switch, and issue a "sh mac-address-table" or "sh mac-address-table multicast" and it should show which port on the 3548 the unknown source mac address "45:00:00:d6:0c:00" is attached. The client on that port is generating this multicast packet and hence the error.
Done that, and there is no record of the multicast address. So, what to do next? Then the heavens smiled on me. Support of this network is being taken from my company and given to another. Cheap shot I know, but there we go.
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