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Local Area High Speed Networks by Dr. Sidnie Feit

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Bridge/Routers

Routers that include a bridging function have been around for a long time. The bridging function was introduced so that routers could forward the unroutable types of traffic. A customer can choose to bridge other routable traffic as well.

Layer 2/3 Switches

Bridges morphed into Layer 2 switches, routers into Layer 3 switches, and bridge/routers (brouters) into Layer 2/3 switches. As before, a customer configures which protocols should be routed and which should be bridged. The difference is that all the actual processing is done a lot faster.

Configuring a Layer 2/3 switch can be a challenge. All the normal router configuration has to be done, along with Layer 2 chores such as VLAN configuration.

Route Once, Switch Many ...

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