Method and system for survival of data plane through a total control plane failure
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United States of America Patent
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Mar 12, 2013
Grant Date -
Jun 25, 2009
app pub date -
Dec 19, 2007
filing date -
Dec 19, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and method for retaining routes in a control plane learned by an inter-domain routing protocol in the event of a connectivity failure between routers. Routers are classified as either route reflectors or originators. A connectivity failure between two routers is determined. A determination is then made whether to propagate a withdrawal of learned routes based on whether the connectivity failure occurred between a route reflector and an originator, two originators, or two route reflectors. A withdrawal of learned routes is propagated to neighboring routers if the connectivity failure occurred between two originators, or between a route reflector and an originator that is inaccessible via an intra-domain routing protocol. No withdrawal of learned routes is propagated if the connectivity failure occurred between two route reflectors, or between a route reflector and an originator that is accessible via an intra-domain routing protocol.
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