This document defines RSVP-TE extensions to establish backup label-
switched path (LSP) tunnels for local repair of LSP tunnels. These
mechanisms enable the re-direction of traffic onto backup LSP tunnels
in 10s of milliseconds, in the event of a failure.
Two methods are defined here. The one-to-one backup method creates
detour LSPs for each protected LSP at each potential point of local
repair. The facility backup method creates a bypass tunnel to
protect a potential failure point; by taking advantage of MPLS label
stacking, this bypass tunnel can protect a set of LSPs that have
similar backup constraints. Both methods can be used to protect
links and nodes during network failure. The described behavior and
extensions to RSVP allow nodes to implement either method or both and
to interoperate in a mixed network.