Recovery from control plane failures in the LDP signalling protocol
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United States of America Patent
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Feb 1, 2011
Grant Date -
Mar 8, 2007
app pub date -
Aug 29, 2006
filing date -
Sep 8, 2005
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Expired
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Abstract
The invention provides a distributed back-up mechanism and a two-step method for facilitating fast control plane recovery in a switched network. In a preferred embodiment, a Label Information Database (LID) maintained at a control node of a GMPLS network is mirrored to an upstream node using the Label Distribution Protocol (LDP). After a control plane interruption resulting in the LDP restart, the control node, using the mirrored information at the upstream node, conducts first a fast coarse LID recovery wherein only the idle labels are identified, to enable the restarted LDP session to process new connection setup. A detailed LDP state information recovery performs in the background in parallel to the normal LDP operations, e.g. using on-demand LDP queries.
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