Below is a log show a host flapping between two port on a 3550;
%SW_MATM-4-MACFLAP_NOTIF: Host 0004.23d2.b0bc in vlan 2 is flapping between port Fa0/23 and port Fa0/11
%SW_MATM-4-MACFLAP_NOTIF: Host 0004.23d2.b0bc in vlan 2 is flapping between port Fa0/11 and port Fa0/23
Host 0004.23d2.b0bc is connect to port23, and port11 is a Dlink switch. Does that mean i have loop on the Dlink? I checked the dlink but did not find the loop cable. I clear the mac-table and ARP table, issue still exist.
switch is 3550, 12.2(35)SE. I found since I upgraded my 3550 this issue happened on many of my 3550. i did not notice before. is the issue with new IOS?
Thanks for advice.