Methods for finding a merge point node for MPLS fast re-route

Details Methods for finding a merge point node for MPLS fast re-route Methods for finding a merge point node for MPLS fast re-route

2003-06-19

2009-12-01

Ngo, Ricky (Department: 2416)

Multiplex communications

Fault recovery

Bypass an inoperative channel

C714S004110

Reexamination Certificate

active

07626925

ABSTRACT:
Methods and apparatus for unambiguously identifying merge points associated with backup label switched paths (LSPs) which substantially bypass border routers included along a primary LSP are disclosed. According to one aspect of the present invention, a method for finding a merge point between a primary LSP and a backup LSP which has a head-end and a tail-end in different regions includes obtaining identifying information, which identifies nodes on the path of the primary LSP, from a record route object associated with the primary LSP. The method also includes comparing a node address of the identifying information with a destination address of the backup LSP or a node address present in a node identifier (node-ID) subobject of the backup LSP to identify the merge point.

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Vasseur, Jean Philippe et al. “Definition of an RRO Node-Id Subobject” May 2003, IETF Internet Draft.

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