A packet was received with an all zero or a multicast source address. The packet is treated as invalid and no learning is done. Excessive flow of such packets can waste CPU cycles. This message is rate-limited and is displayed only for the first such packet received on any interface or VLAN. Subsequent messages will display cumulative count of all such packets received in given interval on all interfaces.
%C4K_L2MAN-6-INVALIDSOURCEADDRESSPACKET: (Suppressed 1 times)Packet received with invalid source MAC address (00:00:00:00:00:00) on port X These errors are only informative and are not directly related with the switch. The important thing is to find the source of the packet or the device that is sending the packet. This indicates that a bad packet was received and was dropped. This could have been sourced as bad packet for different reasons; such as the size of Ethernet frame reported different from expected IP packet size. The issue can be reported due to bad NIC cards, bad NIC drivers, or bad application. This message is for informational purpose only. In older IOS versions, these packets are normally dropped without being logged. If you are receiving a large amount of these errors you might try to track down the source device that is sending the erroneous packets, you'll need to use a network sniffer. You might also examine the adjacent Cisco device for other errors. HTH
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
Q1: What are all the channel operational states from a BR (border role) perspective and what are the rules/conditions to be in each st...
The need was to reach an host inside a LAN through a VPN connection managed by the LAN gateway (Cisco 1921).
The LAN gateway performs NAT and there was a dedicate nat rule for the host i wanted to reach through VPN.
I couldn't connect to the hos...
We have 3 identical switches configured by someone else and would like to claim some of the Gigabit ports(G1/G2/G3/G4) for use on servers. When we try to change the wiring and configuration, we run in to connectivity issues. Attached is a des...