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RIF contains a 2-byte RIF header and one or more route descriptors. Each route descriptor contains a 12-bit ring number and a 4-bit bridge number. The values for the Type field contained in the header indicate the following:

  • 00—Nonbroadcast (specific route): Indicates that this is a regular frame that should be routed to the destination following the information in the route descriptors.

  • 10—All-routes broadcast: Indicates that this is an all-rings explorer packet that should take all possible routes to the destination.

  • 11—Single-route: Indicates that this is a limited broadcast that should take one path to the destination.

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