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