I am getting an error message on a Cat 2980G and CCO isn't much help
%SYS-4-P2_WARN: 1/invalid traffic from multicast source address
55:55:55:55:55:55 on port 3/34
port 3/34 is a dot1q trunk to a Cat 6500
When I receive this message I look on the 2980G and the 6500 and this
address is not in the CAM tables. Were is this coming from? Should I worry
about it? I don't have any of the devices listed below that typically
generate this.
Here is what I found on CCO:
%SYS-4-P2_WARN: 1/Invalid traffic from multicast source address
Problem: The switch is generating "Invalid traffic from multicast source
address" messages.
Platform: Catalyst 4000 family switches
The following is an example of the syslog output you will see when this
error occurs:
%SYS-4-P2_WARN: 1/Invalid traffic from multicast source address
81:00:01:00:00:00 on port 2/1
%SYS-4-P2_WARN: 1/Invalid traffic from multicast source address
81:00:01:01:00:00 on port 2/1
The "Invalid traffic from multicast source address" syslog message is
generated when the switch receives packets with a multicast MAC address as
the source MAC. Using a broadcast or multicast MAC address as the source MAC
for a frame is not standards-compliant behavior. However, the switch still
forwards traffic sourced from a multicast MAC address.
The syslog message indicates the multicast MAC address in the source MAC
field of the frame, and the port on which the traffic was received.
The workaround is to try to identify the end station that is generating
frames with a multicast source MAC address. Typically, such frames are
transmitted from a traffic generator (for example, SmartBits) or third party
devices that share a multicast MAC address (for example, load balancing
firewall or server products).
http://www.cisco.com/warp/public/473/34.shtml#4000_ERRORS
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Bill Carter
CCIE 5022
"To accomplish great things, we must not only act,
but also dream; not only plan, but also believe.
-Anatole France
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