Spanning Tree Loop

[shetoshandasa]

Hi All ,

If we have a switched network with spanning Tree Protocol enabled.. all things are right and no problem here.

what about if some one come with a normal switch ( say DLink or any other type ) or even a cisco switch with SPT Disabled, and connected it to on of our switched with a parallel cables?

Of course a Layer 2 Loop will occur and network may become down..

what is a suitable method to avoid such a fool !!

Can i prevent it , or even detect it and determine the infected port !!

Thanks in advance

 

[burtsbees]

BDPUGuard, RSTP, PVST, portfast---all these things help, but a foolproof way is mac-address-security. That's my story and I'm stickin' to it.

Burt

 

[pegraves]

SUP2 in my lab, but I experienced the real problem with a SUP32 as well. Both are running 8.6(3) CATOS.