Protected switching ring

Details Protected switching ring Protected switching ring

2005-08-09

2005-08-09

Nguyen, Chau (Department: 2661)

Multiplex communications

Fault recovery

Bypass an inoperative station

C370S403000

Reexamination Certificate

active

06928050

ABSTRACT:
Normal 802.3 Ethernet requires a tree topology. If a ring or a loop exists, then packets will be forwarded around the ring indefinitely. If the ring is broken, then there is no possibility of packets being propagated forever. This invention shows how to quickly impose a virtual break in the ring such that all nodes can communicate with each other, and how to remove the virtual break when a real failure occurs. This is accomplished by placing intelligent nodes on the ring that work together to virtually break and restore the ring. An embodiment is disclosed that handles a unidirectional break in a communication link. This abstract is provided as an aid to those performing prior art searches and not a limitation on the scope of the claims.

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