Check the OS of the machine which is connected to that port,from which the specfic mac address is identified.If it is a server OS,then disable the Network load balancing (NLB) service.
Let me know if my solution helps you.
yes this port is connected with win 2000 server with load balancing option.
how can i fix it widout disabling this load balanicg option at switch end.
If you have 'load balancing' configured at the server, you must also configure 'load balancing' at the switch, otherwise it won't work.
At the switch side, configure the following on the ports where this server is connected.
channel-group x mode on
Note, replace the x in the channel-group with the port-channel number you want to use for this implementation. You also need to do this command on both ports at the same time if possible. Do this procedure during a maintenace window
NIC's of this server are conected with two diffreent switches.and both switches could not communicate with each other.
can you please assist me that how can i configure load balancing.
or is there any other solution if any
thanx - raheel
Take a look at this link. How to conigure cisco to work with NLB
this server are conected with two diffreent switches
Well, that changes the whole design suggestion. It can't be done. Please disable the load-balancing in the server to avoid the mac-address flapping in your switch network.
I'm not a server guy but I believe you can enable some kind of load-balancing in the server without sending the same MAC address to the switch. I believe the option is fault-tolerance or load-sharing.