We have a CAT 4006 that is experiencing multiple instances of this error in the log:
Sep 10 10:55:51: %C4K_L2MAN-6-INVALIDSOURCEADDRESSPACKET: (Suppressed 238722 times)Packet received with invalid source MAC address (00:00:00:00:00:00) on port Gi5/24 in vlan 1
We started receiving this error after our conversion from a Sup II engine (CATOS) to a Sup IV engine (IOS). I only receive the message on that one particular interface which happens to be connected to our firewall (ASA5510 on the inside interface). Any thoughts on how I should go about troubleshooting this?