Recovery from control plane interruptions in communication...

Details Recovery from control plane interruptions in communication... Recovery from control plane interruptions in communication...

H - Electricity

04

L

H04L 29/14 (2006.01) H04L 29/04 (2006.01)

Patent

CA 2557678

The invention provides a distributed back-up mechanism and a two-step method for facilitating fast control plane recovery in a switched network 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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