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Local Area High Speed Networks by Dr. Sidnie Feit

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Translational Bridges

One aspect of the move toward building bigger LANs and using fewer routers is that some users are bridging Ethernet, Token Ring, and FDDI LANs to each other. This is being done in spite of some major incompatibilities between these LANs, including differences in the following:

  • Frame sizes

  • Frame format

  • The bit order of the bytes in the frames

  • The MAC addresses that are used for LAN multicasts

  • Transparent and source-routing bridging

No standard defines exactly how translational bridging should be done, although some standards offer partial solutions that work in particular situations. These partial solutions are augmented by as many proprietary solutions as there are vendors.

Making translational bridges work properly requires ...

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