Structuring a LAN Around a High-Speed Ethernet or FDDI Backbone with Tagging

Another option is available to a LAN administrator who wishes to bridge between Ethernet, Token Ring and FDDI LANs. The IEEE 802 VLAN committee introduced VLAN tag features that solve some tagging of the problems encountered in translational bridging between Ethernet, Token Ring, and FDDI.

The IEEE solution supports both transparent LANs and LANs that include source-routed portions. The solution requires frames to be translated, but it offers two advantages:

  • It is defined in a standard (802.1Q).

  • The tag information explicitly states whether MAC addresses contained in the information field are in canonical or non-canonical format.

Using Tags in a Transparently Bridged ...

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