Bridge Number (6 bits) (Token-Ring)

Protocol: Token-Ring RIF / Source Routing RIF PCI (0-30 bytes) (Token-Ring)

Field: RIF / routing designator / ring number

Length: 4 bits

Contents: ring number.

Bridges check all route designator fields of non-broadcast frames for

... ring number

... bridge number

in order to detect their own bridge numbers respectively the attached ring's number.

With broadcast frames, bridges will add another route designator (since the maximum of 8 route designators isn't reached, yet).