FDDI bridge frame learning and filtering apparatus and method

Details FDDI bridge frame learning and filtering apparatus and method FDDI bridge frame learning and filtering apparatus and method

1994-11-10

1996-01-02

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

H04J 302, H04L 1228

Patent

active

054815401

ABSTRACT:
A bridge connected to an FDDI network preprocesses messages each comprising source address (SA), destination address (DA) and data, using a data base of SA's maintained in a content addressable memory (CAM). A finite state machine working with the other elements of the FDDI bridge acts as an intelligent controller, to select which messages are to be passed to a buffer memory for further processing and ultimate transmission to a remote network. Messages are only passed to the buffer memory if the DA is different from the SA's stored in the CAM. Circuitry is advantageously provided not only to "teach" the CAM about SA's on the network, but also to monitor information relating to the the last activity in a station associated with a particular SA, so that "stale" SA's can be purged from the CAM.

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