Failure detection for tunneled label-switched paths

Details Failure detection for tunneled label-switched paths Failure detection for tunneled label-switched paths

2011-05-10

2011-05-10

Shah, Chirag G (Department: 2477)

Multiplex communications

Network configuration determination

C370S389000

Reexamination Certificate

active

07940695

ABSTRACT:
In general, principles of the invention relate to techniques for detecting data plane failures in Multi-Protocol Label Switching (MPLS) Label-Switched Paths (LSPs) that may be tunneled over one or more other LSPs. More specifically, the techniques described herein allow for testing connectivity of an LSP that is tunneled through at least one other LSP, and testing connectivity of an inter-autonomous system LSP. For example, a method comprises providing, with an intermediate label-switching router (LSR) of an LSP, instructions to an ingress LSR of the LSP to modify a forwarding equivalence class (FEC) stack of MPLS echo request packets. The intermediate LSR may provide the instructions within an MPLS echo reply packet.

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