One of our Cat5513 has been displaying a lot of the error message below:
%SYS-4-P2_WARN: 8/Invalid traffic from multicast source address 01:00:5a:52:4c:4d on port 8/58
The frequency of this is quite disturbing. Any idea what this error is about? Module no.8 is our Gigabit Ethernet WS-X5410. Can that multicast address be mapped to an IP address or unicast mac-addresS? How can i go about resolving this?
However, I don't see an assigned address prefix of 01-00-5A. What devices have you got connected to port 8/58. You might have to trace through all your switches to find out which port the offending device is connected to.
Thanks for the reply Paresh. Port 8/58 is a virtual port of some kind since there are nowhere near 58 ports on any of Cisco's modules! I suspect is the backplane connecting Module no.8 to the Cat5513. Unfortunately I'm not quite sure how to go about tracing this mac-address.. show cam doesnt seem to reveal .. to go through all the switches would be near impossible since we have more than 100+ switches in our university. Yeah, the assigned address prefix of 01-00-5A is dodgy.. i was thinking of a map for those assigned address prefixes of 01-00-5e but I've never seen 5A before..I'm assuming that's the layer-2 multicast address, which means there's an equivalent layer-2 unicast address, although I do not know how to link them together
you get this message because this mac address has the I/G bit set so it is a group address and can never be a source address but it could be a destination address. the multicast L2 range for mapping L3 multicast is 01-00-5E not 5A so it is
either a malformed address due to a faulty ethernet controller or someone sending forged mac addresses.
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