MPLS

[George Swallow <swallow@cisco.com>]

NAME OF I-D:

   RSVP Label Allocation for Backup Tunnels

   draft-swallow-rsvp-bypass-label-01.txt


SUMMARY

   This document describes the use of RSVP[RFC2205], to establish backup
   tunnels for local repair of LSP tunnels.  The RSVP extensions for
   setting up LSP tunnels are described in [2].


RELATED DOCUMENTS

[RFC2205] Braden, R. et al., "Resource ReSerVation Protocol (RSVP) --
    Version 1, Functional Specification", RFC 2205, September 1997.

[RSVP-TE] Awduche, D. et al., "Extensions to RSVP for LSP Tunnels",
    Internet Draft, draft-ietf-mpls-rsvp-lsp-tunnel-08.txt, February,
    2001.


WHERE DOES IT FIT IN THE PICTURE OF THE SUB-IP WORK

   Various WG within the SUB-IP Area are concerned with
backup/restoration.  This document provides one piece of the
solution.  The mechanism described in the document are targeted at
restoration of MPLS TE-tunnels using RSVP as the signalling protocol.


WHY IS IT TARGETED AT THIS WG

    The mechanisms are specific to MPLS.  In particular the draft
relies on two mechanisms.  First is the ability to merge two tunnels
at an arbitrary node within a network.  This function is not generally
available in other tecnologies.  The second is reliance on a label
stack.  This (AFAIK) is available in no other technology.


JUSTIFICATION

    Tunnel restoration is an important function for those providers
wishing to offer highly reliable services.

Note: this draft is currently in workgroup last call.

==================================================================
George Swallow       Cisco Systems                   (978) 244-8143
                     250 Apollo Drive
                     Chelmsford, Ma 01824