MPLS draft-ietf-mpls-lsp-hierarchy-02.txt

[Kireeti Kompella <kireeti@juniper.net>]

NAME OF ID

  http://search.ietf.org/internet-drafts/draft-ietf-mpls-lsp-hierarchy-02.txt

SUMMARY

   To improve scalability of MPLS TE it may be useful to aggregate TE
   LSPs.  The aggregation is accomplished by (a) an LSR creating a TE
   LSP, (b) the LSR forming a forwarding adjacency out of that LSP
   (advertising this LSP as a link into ISIS/OSPF), (c) allowing other
   LSRs to use forwarding adjacencies for their path computation, and
   (d) nesting of LSPs originated by other LSRs into that LSP (by using
   the label stack construct).

   This document describes the mechanisms to accomplish this.


RELATED DOCUMENTS

   none


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

   MPLS


WHY IS IT TARGETED AT THIS WG

   There are new mechanisms and procedures for RSVP-TE and CR-LDP;
   extensions to these protocols belong in MPLS.


JUSTIFICATION

   This ID provides a means of tunneling LSPs within LSPs.  This is a
   useful tool that allows aggregation, improves scalability, and
   enables hierarchical TE.  Applications include multi-area TE, and
   signaling for optical/SONET/SDH networks.

   Current status of this draft: this is a WG document of the MPLS WG.
   There were few or no nay-sayers when consensus was sought to make
   this a WG document; it appears that the utility of the document and
   the mechanisms proposed were accepted.