mpls draft-kini-isis-lsp-restoration-00.txt

[Curtis Villamizar <curtis@curtis-lt.avici.com>]

NAME OF I-D:

  <http://www.ietf.org/internet-drafts/draft-kini-isis-lsp-restoration-00.txt>
 
SUMMARY:

  "Intermediate System to Intermediate System (IS-IS)     protocol 
  extensions for Label Switched Path restoration", Curtis Villamizar, T. V.
  Lakshman, Sriganesh Kini, Murali Kodialam, 11/08/2000, 
  <draft-kini-isis-lsp-restoration-00.txt>                                 

    Traffic engineering using MPLS involves the setting up of label
    switched paths (LSP) possibly with explicit routing and with
    bandwidth guarantees (for label switched paths). The reliability of
    these LSPs can be increased by providing a backup LSP onto which
    traffic can be switched upon failure of an element in the path of the
    active LSP. Backup LSPs can be routed in a way that bandwidth can be
    shared between backup links of more than one active path while still
    guaranteeing recoverability for a set of failures. This sharing greatly
    increases the network efficiency thereby increasing the number of LSPs
    that can be carried while maintaining guarantees. Algorithms which can
    route such recoverable LSPs while using only aggregate network usage 
    information are being developed. To route the active LSP and the
    (possibly shared) backup LSP, the topology information of the network
    is needed and  this can be provided by a link state routing protocol
    like IS-IS. This document describes the encoding of the additional
    information within the link state protocol data unit (LSPdu) of IS-IS
    to enable routing of shared backup paths.

RELATED DOCUMENTS:
 
  "Shared backup Label Switched Path restoration", Curtis Villamizar, T. V.
  Lakshman, Sriganesh Kini, Murali Kodialam, 11/08/2000, 
  <draft-kini-restoration-shared-backup-00.txt>                            
 
  "ReSerVation Protocol with Traffic Engineering extensions.Extension for 
  Label Switched Path estoration", Curtis Villamizar, T. V. Lakshman, 
  Sriganesh Kini, Murali Kodialam, 11/08/2000, 
  <draft-kini-rsvp-lsp-restoration-00.txt>                                 

  "Open Shortest Path First (OSPF) protocol extensions for Label Switched
  Path restoration", Curtis Villamizar, T. V. Lakshman, Sriganesh Kini,
  Murali Kodialam, 11/08/2000, <draft-kini-ospf-lsp-restoration-00.txt>

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

  It is in MPLS but the picture is broken.  GMPLS == C control and
  MPLS fits under GMPLS and over the others (OPT, TDM, ATM, FR, etc).

WHY IS IT TARGETED AT THIS WG:

  This work is generic to MPLS restoration and not specific to any
  underlying technology, such as optical switching.

JUSTIFICATION:

  See <draft-kini-restoration-shared-backup-00.txt> for overall
  description of this work.

  Protocol extensions to ISIS specifically for MPLS/TE are being
  handled in the MPLS WG rather than ISIS (as of last meeting if I
  understood correctly) and therefore this work fits into MPLS.

  The technique is generally applicable to MPLS and accommodated but
  is not specific to MPLS used in optical networks, rings, switched
  services, or TDM.  Therefore the MPLS WG would be slightly preferred
  over CCAMP.  If MPLS restoration is supposed to happen in CCAMP,
  then it belongs in CCAMP.