Spanning Tree Protocol

chowsy · ‎09-01-2003

Hi,

I got a cisco switch with all ports configured to a single vlan. If I turn on spanning tree protocol for all ports, and if I connect port 1 to port 2. Will it affect the network that is connected to other ports since there is a loop and hence will create broadcast storm.

The reason I asked this is that all the spanning tree protocol documents are talking about more than 2 switches which a spanning-tree capable. I am talking about a single switch with ports looping.

If spanning-tree cannot block port 1 and port 2, what is the solution to prevent broadcast storm when port 1 and 2 are connected together?

Thanks a lot.

adrian

milan.kulik · ‎09-01-2003

Hi,

if you connect connect port 1 to port 2 on the same switch, STP should block one port (probably port 2 if you leave the deafult values).

But you can create a loop when connecting a hub to port 1 and make a loop connecting together two ports on the hub.

Use STP bpduguard feature (http://www.cisco.com/warp/public/473/65.pdf) to prevent broadcast storm in that case.

Regards,

Milan