CCAMP draft-suemura-protection-hierarchy-00.txt

[Yoshihiko SUEMURA <y-suemura@bp.jp.nec.com>]

NAME OF I-D:

  http://www.ietf.org/internet-drafts/draft-suemura-protection-hierarchy-00.txt

SUMMARY

   In this document, we propose two different mechanisms for protection 
   of hierarchical LSPs.  We assume that an hierarchical LSP traverses a 
   network that is partitioned into multiple smaller, non-overlapping 
   subnetworks.  Protection of the hierarchical LSP can be realized 
   through two mechanisms: 1)Subnetwork Protection and 2)End-to-end 
   Protection.  In the subnetwork protection, a backup LSP is pre-
   established within each subnetwork.  In the end-to-end protection, 
   only one end-to-end backup LSP traversing the subnetworks is pre-
   established.  These LSP protection mechanisms are applicable to both 
   vertical and horizontal network hierarchy.  In this document, we also 
   propose procedures for applying the LSP protection mechanisms to 
   vertical hierarchy in a single routing domain.  A simple coordination 
   mechanism for avoiding contentions between protection mechanisms at 
   different layers is addressed as well. 

RELATED DOCUMENTS

  http://www.ietf.org/internet-drafts/draft-ietf-tewg-restore-hierarchy-00.txt
  http://www.ietf.org/internet-drafts/draft-ietf-mpls-lsp-hierarchy-03.txt
  http://www.ietf.org/internet-drafts/draft-ietf-ccamp-gmpls-architecture-01.txt
  http://www.ietf.org/internet-drafts/draft-ietf-mpls-generalized-signaling-07.txt
  http://www.ietf.org/internet-drafts/draft-ietf-ccamp-gmpls-routing-01.txt

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

  CCAMP WG

WHY IS IT TARGETED AT THIS WG

  This document addresses the following work item in the CCAMP charter:
  
  - Abstract link and path properties needed for link and path
    protection. Define signalling mechanisms for path protection,
    diverse routing and fast path restoration. Ensure that multi-layer
    path protection and restoration functions are achievable using the
    defined signalling and measurement protocols, either separately or
    in combination. 

JUSTIFICATION

  While this document does not describe specific protocol extensions, it
  describes basic mechanisms for multi-layer path protection. This will
  be a good first step for defining necessary protocol extensions to
  achieve multi-layer protection.
  So, I believe this document is justified for the CCAMP WG.