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Abstract

Techniques are described for providing routing scalability within a protocol such as a label distribution protocol. A method comprises receiving a label mapping message at an ingress router for establishing a label switched path (LSP) that identifies within a first portion a first label to be used for forwarding network traffic to an intermediate router of the LSP, and identifies within a separate portion a second label to be used for forwarding network traffic to an egress router of the LSP. The method further comprises parsing the first and separate portions, installing first forwarding state at the ingress router identifying the first label for forwarding network traffic to the intermediate router, and installing second forwarding state at the ingress router identifying a two-label stack comprising the first label as an outer label and the second label as an inner label for forwarding network traffic to the egress router.

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First Claim