About Bridging
The transparent bridge shown here serves to isolate the two seg- ments: Network traffic meant only for devices on segment A is lim- ited to the backbone serving segment A.These packets are not passed across the bridge.Traffic on segment B is also restricted to that segment. Only packets originating on one segment that are intended for devices on the other segment (A to B and B to A) are passed across the bridge and carried by both backbones.
What traffic is actually passed across the bridge is largely config- urable.The bridge can be left alone to “learn” what devices live on each segment, or it can be manually set up to pass packets only to certain addresses, or certain ranges of addresses can be arbitrarily forwarded or blocked.
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