Cisco Switch Problem: %rtd-1-addr_flap:

[mrbari]

Hi all,

I am having weird problem on my cisco switches. Let me explain the situation. I have got 3 switches those are interconnected to each other and there is NO redundent link in between.
I am not getting any error message when they are on live. But as soon as I connect my laptop (with a static IP which is not been used anywhere in the network) in any port of my switches, it starts getting the following message. As soon as I unplauged my connect and these error message stops.

Dec 21 09:52:39.216 GMT: %RTD-1-ADDR_FLAP: FastEthernet0/23 relearning 48 addrs per min
Dec 21 09:53:39.215 GMT: %RTD-1-ADDR_FLAP: FastEthernet0/23 relearning 16 addrs per min
Dec 21 09:54:39.223 GMT: %RTD-1-ADDR_FLAP: FastEthernet0/23 relearning 18 addrs per min
Dec 21 09:55:39.214 GMT: %RTD-1-ADDR_FLAP: FastEthernet0/23 relearning 21 addrs per min
Dec 21 09:56:39.214 GMT: %RTD-1-ADDR_FLAP: FastEthernet0/23 relearning 14 addrs per min
Dec 21 09:57:39.213 GMT: %RTD-1-ADDR_FLAP: FastEthernet0/23 relearning 19 addrs per min
Dec 21 09:58:39.215 GMT: %RTD-1-ADDR_FLAP: FastEthernet0/23 relearning 14 addrs per min

I have checked with ' debug ethernet-controller addresses' and the mac address which was causing the issue was my laptop's mac address.

Any Idea, where am I missing the point?????

Regards

Mohammad

[Milton.J]

Mostly this error occurs when there is a reduntant link present between the switches but as you that there is no reduntant link present then it can be because of a faulty IOS. An IOS patch or upgrade will solve the problem. Also check whether the Spanning tree is running on the ports concerned and enable it if it has been disabled. A faulty NIC or a faulty Patch cord also creates the same error sometimes.