Path Computation Element Communication Protocol (PCEP) Extensions for Stateful PCE
RFC 8231

Document Type RFC - Proposed Standard (September 2017; No errata)
Last updated 2017-09-21
Replaces draft-crabbe-pce-stateful-pce, draft-crabbe-pce-stateful-pce-mpls-te
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Julien Meuric
Shepherd write-up Show (last changed 2016-12-05)
IESG IESG state RFC 8231 (Proposed Standard)
Consensus Boilerplate Yes
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Responsible AD Deborah Brungard
Send notices to "Julien Meuric" <julien.meuric@orange.com>
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Internet Engineering Task Force (IETF)                         E. Crabbe
Request for Comments: 8231                                        Oracle
Category: Standards Track                                       I. Minei
ISSN: 2070-1721                                             Google, Inc.
                                                               J. Medved
                                                     Cisco Systems, Inc.
                                                                R. Varga
                                               Pantheon Technologies SRO
                                                          September 2017

         Path Computation Element Communication Protocol (PCEP)
                      Extensions for Stateful PCE

Abstract

   The Path Computation Element Communication Protocol (PCEP) provides
   mechanisms for Path Computation Elements (PCEs) to perform path
   computations in response to Path Computation Client (PCC) requests.

   Although PCEP explicitly makes no assumptions regarding the
   information available to the PCE, it also makes no provisions for PCE
   control of timing and sequence of path computations within and across
   PCEP sessions.  This document describes a set of extensions to PCEP
   to enable stateful control of MPLS-TE and GMPLS Label Switched Paths
   (LSPs) via PCEP.

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/rfc8231.

Crabbe, et al.               Standards Track                    [Page 1]
RFC 8231            PCEP Extensions for Stateful PCE      September 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
   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.

Crabbe, et al.               Standards Track                    [Page 2]
RFC 8231            PCEP Extensions for Stateful PCE      September 2017

Table of Contents

   1. Introduction ....................................................5
      1.1. Requirements Language ......................................5
   2. Terminology .....................................................5
   3. Motivation and Objectives for Stateful PCE ......................6
      3.1. Motivation .................................................6
           3.1.1. Background ..........................................6
           3.1.2. Why a Stateful PCE? .................................7
           3.1.3. Protocol vs. Configuration ..........................8
      3.2. Objectives .................................................9
   4. New Functions to Support Stateful PCEs ..........................9
   5. Overview of Protocol Extensions ................................10
      5.1. LSP State Ownership .......................................10
      5.2. New Messages ..............................................11
      5.3. Error Reporting ...........................................11
      5.4. Capability Advertisement ..................................11
      5.5. IGP Extensions for Stateful PCE Capabilities
           Advertisement .............................................12
      5.6. State Synchronization .....................................13
      5.7. LSP Delegation ............................................16
           5.7.1. Delegating an LSP ..................................16
           5.7.2. Revoking a Delegation ..............................17
           5.7.3. Returning a Delegation .............................19
           5.7.4. Redundant Stateful PCEs ............................19
           5.7.5. Redelegation on PCE Failure ........................20
      5.8. LSP Operations ............................................21
           5.8.1. Passive Stateful PCE Path Computation
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