Classic Token Ring Protocol Elements

The sections that follow outline the major features of the classic Token Ring protocol, including

  • Token Ring MAC addresses

  • The Token Ring format

  • LLC frame formats

  • MAC frame formats

  • Parameters

  • Routing information

  • Timers

  • Types of MAC protocol frames

Addresses

The IEEE LAN addresses described in Chapter 2, "LAN MAC Addresses," are used in Token Rings. However, these addresses are used in a special manner:

  • Each address byte is written in reverse order. The first bit of a destination address indicates whether it is an individual address (0) or a group address (1). The second bit indicates whether it is a universal (0) or local (1) address.

  • The first bit of a source address is set to 1 to indicate that that a routing ...

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