Optimizations of Label Switched Path State Synchronization Procedures for a Stateful PCE
RFC 8232

Document Type RFC - Proposed Standard (September 2017; No errata)
Last updated 2017-09-21
Replaces draft-minei-pce-stateful-sync-optimizations
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Internet Engineering Task Force (IETF)                         E. Crabbe
Request for Comments: 8232                                        Oracle
Category: Standards Track                                       I. Minei
ISSN: 2070-1721                                             Google, Inc.
                                                               J. Medved
                                                     Cisco Systems, Inc.
                                                                R. Varga
                                               Pantheon Technologies SRO
                                                                X. Zhang
                                                                D. Dhody
                                                     Huawei Technologies
                                                          September 2017

       Optimizations of Label Switched Path State Synchronization
                     Procedures for a Stateful PCE

Abstract

   A stateful Path Computation Element (PCE) has access to not only the
   information disseminated by the network's Interior Gateway Protocol
   (IGP) but also the set of active paths and their reserved resources
   for its computation.  The additional Label Switched Path (LSP) state
   information allows the PCE to compute constrained paths while
   considering individual LSPs and their interactions.  This requires a
   State Synchronization mechanism between the PCE and the network, the
   PCE and Path Computation Clients (PCCs), and cooperating PCEs.  The
   basic mechanism for State Synchronization is part of the stateful PCE
   specification.  This document presents motivations for optimizations
   to the base State Synchronization procedure and specifies the
   required Path Computation Element Communication Protocol (PCEP)
   extensions.

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/rfc8232.

Crabbe, et al.               Standards Track                    [Page 1]
RFC 8232         Optimizations of State Synchronization   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 8232         Optimizations of State Synchronization   September 2017

Table of Contents

   1. Introduction ....................................................4
      1.1. Requirements Language ......................................4
   2. Terminology .....................................................5
   3. State Synchronization Avoidance .................................5
      3.1. Motivation .................................................5
      3.2. State Synchronization Avoidance Procedure ..................5
           3.2.1. IP Address Change during Session Re-establishment ..10
      3.3. PCEP Extensions ...........................................11
           3.3.1. LSP-DB Version Number TLV ..........................11
           3.3.2. Speaker Entity Identifier TLV ......................12
   4. Incremental State Synchronization ..............................13
      4.1. Motivation ................................................13
      4.2. Incremental Synchronization Procedure .....................14
   5. PCE-Triggered Initial Synchronization ..........................17
      5.1. Motivation ................................................17
      5.2. PCE-Triggered Initial State Synchronization Procedure .....18
   6. PCE-Triggered Resynchronization ................................19
      6.1. Motivation ................................................19
      6.2. PCE-Triggered State Resynchronization Procedure ...........19
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