I'm getting notifications on my Syslog server from the Netgear switches GS748Tv4 and v5. These are the notifications:
traputil.c(696) 122305 %% Link Down: g30 traputil.c(696) 122323 %% Link Up: g30 traputil.c(739) 122307 %% Spanning Tree Topology Change: 0, Unit: 1 traputil.c(739) 122308 %% Spanning Tree Topology Change Initiated: 0, Interface: g30
Not only for the port g30 but for other ports as well. STP is enabled on both swithces. I don't know exactly what is causing this but when this happens, the user loses connection.