02-09-2006 07:53 PM - edited 03-03-2019 01:46 AM
Hi,
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?
thanks
woon
02-09-2006 08:09 PM
Hi Woon,
There is a list of multicast address fixes at this location:
http://www.cavebear.com/CaveBear/Ethernet/multicast.html
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.
Hope that helps.
Paresh
02-10-2006 12:04 AM
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
02-10-2006 12:45 AM
The 8/58 is most likely a reference to a port channel. Issue the show port command to verify this.
If this channel is a vlan trunk, you might still be left with quite some seaching but knowing this should limit the possible origin substantially.
It could be anything from a load balancing server farm to a network gaming protocol. Happy hunting!
Regards,
Leo
02-08-2013 09:10 AM
I have the same problem, but my switch is directly connected to router 7200VXR-NPEG1, with optic fiber wire.
so there is no posibility that MAC 01:00:5a:52:4c:4d came from this router because the router MAC in this interface is 001e.1426.bc1a.
so how can be this possibly? how I can stop multicast in switch / routers interfaces at the edge?
(switch 4506) - (router7200VXR-NPEG1)
look up the log:
Feb 8 05:37:56: %C4K_L2MAN-6-INVALIDSOURCEADDRESSPACKET: (Suppressed 4 times)Packet received with invalid source MAC address (01:00:5A:52:4C:4D) on port Gi1/2 in vlan 1
sw_4500#sh cdp ne
rtpeclo01 Gig 1/2 150 R 7206VXR Gig 0/2
rt_7200#sh run int gi 0/2
interface GigabitEthernet0/2
ip address 10.100.2.1 255.255.255.0
media-type gbic
end
rt_7200#sh arp | in 10.100.2.1
Internet 10.100.2.1 - 001e.1426.bc1a ARPA GigabitEthernet0/2
sw_4500#sh run int gi 1/2
interface GigabitEthernet1/2
switchport trunk encapsulation dot1q
switchport mode trunk
end
02-08-2013 11:59 AM
Hi,
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.
Regards
Alain
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