Packets with a multicast MAC address as the source MAC cause the %SYS-4-P2_WARN: 1/Invalid traffic from multicast source addressmessage to be logged on a Catalyst switch.
The following is an example of the syslog output 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
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 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, such as a load balancing firewall or server product.
Use a sniffer to identify the device generating the frames with multicast MAC addresses as source MAC addresses. This must be done at the time the messages are being logged. Start the trace at the port indicated in the error message.
%SYS-4-P2_WARN: 1/Invalid traffic from multicast source address
Help me!Log Buffer (4096 bytes):Interface EOBC18/1, changed state to up*Aug 23 04:55:41.364: %LINK-3-UPDOWN: Interface GigabitEthernet0/0, changed state to down*Aug 23 04:55:41.364: %LINK-3-UPDOWN: Interface LIIN18/2, changed state to up*Aug 23 04:55:41.5...
I looked for some forums and I didn't get a clear answer, so let's try again. With the new CCIE test from February 2020 onwards, anyone who is CCNP (valid, exemple, expiring in 2022) will be able to take the new practice test directly, or will need t...
HSRP failback doesnt work properly. standby status changes ACT <=> SBY unstably when its time to failback.but without "mac-address-table secure" setting, the failback worksi think mac address filter is the problem, but i dont know how to fix... can ...
Aren't they all for inband queue?
*show system inband queuing statistics
*show hardware internal cpu-mac inband stats
show system inband queuing statistics (Drop)
Inband packets unmapped to a queue: 0
Inband packets mapped...
Hello all and thanks for your time and expertise. Please note this question is not a hard line technical question per se. Here's the scenario: There's a tech in my department that has zero IT training or background (doesn't even hal...