Here is the description for the error message from the Cisco documentation:
%SYS-4-P2_WARN: 1/Invalid traffic from multicast source address
Problem: The switch is generating Invalid traffic from multicast source address messages.
Description: 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).
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