Stateful Path Computation Element (PCE) Protocol Extensions for Usage with Point-to-Multipoint TE Label Switched Paths (LSPs)
RFC 8623

Document Type RFC - Proposed Standard (June 2019; No errata)
Last updated 2019-06-26
Replaces draft-palle-pce-stateful-pce-p2mp, draft-palle-pce-stateful-pce-initiated-p2mp-lsp
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Internet Engineering Task Force (IETF)                          U. Palle
Request for Comments: 8623                                      D. Dhody
Category: Standards Track                            Huawei Technologies
ISSN: 2070-1721                                                Y. Tanaka
                                                      NTT Communications
                                                               V. Beeram
                                                        Juniper Networks
                                                               June 2019

      Stateful Path Computation Element (PCE) Protocol Extensions
   for Usage with Point-to-Multipoint TE Label Switched Paths (LSPs)

Abstract

   The Path Computation Element (PCE) has been identified as an
   appropriate technology for the determination of the paths of point-
   to-multipoint (P2MP) TE Label Switched Paths (LSPs).  This document
   provides extensions required for the Path Computation Element
   Communication Protocol (PCEP) so as to enable the usage of a stateful
   PCE capability in supporting P2MP TE LSPs.

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
   https://www.rfc-editor.org/info/rfc8623.

Palle, et al.                Standards Track                    [Page 1]
RFC 8623                      Stateful P2MP                    June 2019

Copyright Notice

   Copyright (c) 2019 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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Supporting P2MP TE LSPs for Stateful PCE  . . . . . . . . . .   4
     3.1.  Motivation  . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Objectives  . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Functions to Support P2MP TE LSPs for Stateful PCEs . . . . .   5
   5.  Architectural Overview of Protocol Extensions . . . . . . . .   6
     5.1.  Extension of PCEP Messages  . . . . . . . . . . . . . . .   6
     5.2.  Capability Advertisement  . . . . . . . . . . . . . . . .   7
     5.3.  IGP Extensions for Stateful PCE P2MP Capabilities
           Advertisement . . . . . . . . . . . . . . . . . . . . . .   7
     5.4.  State Synchronization . . . . . . . . . . . . . . . . . .   8
     5.5.  LSP Delegation  . . . . . . . . . . . . . . . . . . . . .   8
     5.6.  LSP Operations  . . . . . . . . . . . . . . . . . . . . .   9
       5.6.1.  Passive Stateful PCE  . . . . . . . . . . . . . . . .   9
       5.6.2.  Active Stateful PCE . . . . . . . . . . . . . . . . .   9
       5.6.3.  PCE-Initiated LSP . . . . . . . . . . . . . . . . . .   9
         5.6.3.1.  P2MP TE LSPs Instantiation  . . . . . . . . . . .   9
         5.6.3.2.  P2MP TE LSPs Deletion . . . . . . . . . . . . . .  10
         5.6.3.3.  Adding and Pruning Leaves for the P2MP TE LSP . .  10
         5.6.3.4.  P2MP TE LSPs Delegation and Cleanup . . . . . . .  10
   6.  PCEP Message Extensions . . . . . . . . . . . . . . . . . . .  11
     6.1.  The PCRpt Message . . . . . . . . . . . . . . . . . . . .  11
     6.2.  The PCUpd Message . . . . . . . . . . . . . . . . . . . .  13
     6.3.  The PCReq Message . . . . . . . . . . . . . . . . . . . .  14
     6.4.  The PCRep Message . . . . . . . . . . . . . . . . . . . .  15
     6.5.  The PCInitiate Message  . . . . . . . . . . . . . . . . .  16
     6.6.  Example . . . . . . . . . . . . . . . . . . . . . . . . .  17

Palle, et al.                Standards Track                    [Page 2]
RFC 8623                      Stateful P2MP                    June 2019

       6.6.1.  P2MP TE LSPs Update Request . . . . . . . . . . . . .  17
       6.6.2.  P2MP TE LSP Report  . . . . . . . . . . . . . . . . .  17
       6.6.3.  P2MP TE LSPs Initiation Request . . . . . . . . . . .  18
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