QoS-IP'05 Proceedings of the Third international conference on Quality of Service in Multiservice IP Networks
A fast path recovery mechanism for MPLS networks
ICN'05 Proceedings of the 4th international conference on Networking - Volume Part II
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LDP (Label Distribution Protocol) is used in thecontrol plane to control an optical network.The dataplane and the control plane of an optical network couldbe physically separate.So a failure in the control planedoes not necessarily imply a data plane failure and thatuser communications have to be interrupted.Thestandard LDP,however,does not provide any mechanismto recover the knowledge stored in LDP entities about thestatus of the data plane after the faults are fixed.This is areliability problem of LDP and results in the unnecessarydegradation of user communications.On the other hand,in MPLS-enabled IP networks, being able to recover LDPsessions would be potentially faster and more scalablethan to re-establish all affected LSPs.The proposed recovery method of LDP for the controlplane failures uses Label Information Mirrors (LIMs)inupstream LSRs.Each LIM is a copy of the LabelInformation Database (LID) in the downstream LSR of anLDP session.We propose a systematic approach tosynchronize the contents of a LIM and the correspondingLID, and show how a LIM is used to handle a controlplane failure.Detailed descriptions of the recoveryprocedure for both control channel failures and controlnode failures are presented.Some significant features ofthe proposal are outlined.