Apparatus and method for rapid detection of unidirectional breaks in a network ring
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United States of America Patent
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Apr 8, 2008
Grant Date -
Sep 15, 2005
app pub date -
May 10, 2005
filing date -
May 6, 2003
priority date (Note) -
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status (Latency Note)
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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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