RFC 4090 on Fast Reroute Extensions to RSVP-TE for LSP Tunnels

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Subject: RFC 4090 on Fast Reroute Extensions to RSVP-TE for LSP Tunnels
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A new Request for Comments is now available in online RFC libraries.

        RFC 4090

        Title:      Fast Reroute Extensions to RSVP-TE for LSP Tunnels
        Author(s):  P. Pan, Ed., G. Swallow, Ed., A. Atlas, Ed.
        Status:     Standards Track
        Date:       May 2005
        Mailbox:    ppan@hammerheadsystems.com, swallow@cisco.com,
        Pages:      38
        Characters: 83965
        Updates/Obsoletes/SeeAlso:    None

        I-D Tag:    draft-ietf-mpls-rsvp-lsp-fastreroute-07.txt

        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc4090.txt

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

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.

This document is a product of the Multiprotocol Label Switching
Working Group of the IETF.

This is now a Proposed Standard Protocol.

This document specifies an Internet standards track protocol for
the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the
"Internet Official Protocol Standards" (STD 1) for the
standardization state and status of this protocol.  Distribution
of this memo is unlimited.

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