<187>Nov 14 06:12:31.298 SW1 %LINK-3-UPDOWN: Interface port 3, changed state to down <187>Nov 14 06:12:31.904 SW1 %LINK-3-UPDOWN: Interface port 3, changed state to up <187>Nov 14 06:12:32.010 SW1 %STP-6-TOPOLOGY_CHANGE: topology change detected on port 3