Multiplex communications – Fault recovery
Reexamination Certificate
2008-04-08
2008-04-08
Wilson, Robert W. (Department: 2616)
Multiplex communications
Fault recovery
C370S403000
Reexamination Certificate
active
11125683
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 where the unidirectional break is not sensed as an OPER DOWN state. 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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Griswold David Stephen
Lynch Robert Leroy
Pate Prayson Will
Swope Glenn Russell
Flynn Kevin E.
Overture Networks, Inc.
The Eclipse Group LLP
Wilson Robert W.
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