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Local Area High Speed Networks by Dr. Sidnie Feit

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Chapter 16. VLANs and Frame Priority

The introduction of efficient bridges (Layer 2 switches) has made it easy to build very large LANs. There are some advantages to letting a LAN grow very large instead of cutting it into separate smaller LANs that are separated by routers:

  • Fewer routers are needed. High-capacity routers are more costly than bridges.

  • Many administrators feel that routers are more complicated to configure than bridges.

  • Bridges forward traffic faster than routers (although current Layer 3 switcheswhich are routersare fairly fast).

Note

Keep in mind that by definition, a LAN contains only hubs (Layer 1 wiring concentrators) and bridges (Layer 2 switches). When you go through a router, you have left a LAN.

Building a big physical ...

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