RSVP Extensions for Reoptimization of Loosely Routed Point-to-Multipoint Traffic Engineering Label Switched Paths (LSPs)
RFC 8149

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Internet Engineering Task Force (IETF)                      T. Saad, Ed.
Request for Comments: 8149                                R. Gandhi, Ed.
Category: Standards Track                                         Z. Ali
ISSN: 2070-1721                                      Cisco Systems, Inc.
                                                              R. Venator
                                      Defense Information Systems Agency
                                                               Y. Kamite
                                          NTT Communications Corporation
                                                              April 2017

          RSVP Extensions for Reoptimization of Loosely Routed
  Point-to-Multipoint Traffic Engineering Label Switched Paths (LSPs)

Abstract

   The reoptimization of a Point-to-Multipoint (P2MP) Traffic
   Engineering (TE) Label Switched Path (LSP) may be triggered based on
   the need to reoptimize an individual source-to-leaf (S2L) sub-LSP or
   a set of S2L sub-LSPs, both using the Sub-Group-based reoptimization
   method, or the entire P2MP-TE LSP tree using the Make-Before-Break
   (MBB) method.  This document discusses the application of the
   existing mechanisms for path reoptimization of loosely routed Point-
   to-Point (P2P) TE LSPs to the P2MP-TE LSPs, identifies issues in
   doing so, and defines procedures to address them.  When reoptimizing
   a large number of S2L sub-LSPs in a tree using the Sub-Group-based
   reoptimization method, the S2L sub-LSP descriptor list may need to be
   semantically fragmented.  This document defines the notion of a
   fragment identifier to help recipient nodes unambiguously reconstruct
   the fragmented S2L sub-LSP descriptor list.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc8149.

Saad, et al.                 Standards Track                    [Page 1]
RFC 8149               P2MP-TE Loosely Routed LSPs            April 2017

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................3
   2. Conventions Used in This Document ...............................4
      2.1. Key Word Definitions .......................................4
      2.2. Abbreviations ..............................................4
      2.3. Terminology ................................................4
   3. Overview ........................................................5
      3.1. Loosely Routed Inter-domain P2MP-TE LSP Tree ...............5
      3.2. Existing Mechanism for Tree-Based P2MP-TE LSP
           Reoptimization .............................................6
      3.3. Existing Mechanism for Sub-Group-Based P2MP-TE LSP
           Reoptimization .............................................7
   4. Signaling Extensions for Loosely Routed P2MP-TE LSP
      Reoptimization ..................................................8
      4.1. Tree-Based Reoptimization ..................................8
      4.2. Sub-Group-Based Reoptimization Using Fragment Identifier ...9
   5. Message and Object Definitions .................................11
      5.1. "P2MP-TE Tree Re-evaluation Request" Flag .................11
      5.2. "Preferable P2MP-TE Tree Exists" Path Error Sub-code ......11
      5.3. Fragment Identifier for S2L Sub-LSP Descriptor ............11
   6. Compatibility ..................................................12
   7. IANA Considerations ............................................13
      7.1. "P2MP-TE Tree Re-evaluation Request" Flag .................13
      7.2. "Preferable P2MP-TE Tree Exists" Path Error Sub-code ......13
      7.3. Fragment Identifier for S2L Sub-LSP Descriptor ............14
   8. Security Considerations ........................................14