CREATING A LOOP-FREE ENVIRONMENT WITH OTHER BRIDGES BY USING THE SP...

3.

Creating a loop-free environment with other bridges by using the Spanning Tree Protocol

The Forward Versus Filter Decision

Transparent bridges reduce collisions by forwarding traffic from one segment to the other

only when necessary. To decide whether to forward a frame, the bridge uses a dynamically

built table, called a bridge table. The bridge examines the bridging table to decide whether it

should forward a frame. For example, consider the simple network shown in Figure 9-3, with

Fred first sending a frame to Barney and then one to Wilma.

Figure 9-3

Example Transparent Bridging Forwarding and Filtering Decision

Frame sent to 0200.2222.2222…

Came in E0-

I should FILTER it, because

destination is on port E0

Fred

Wilma