Optimizations of Label Switched Path State Synchronization Procedures for a Stateful PCE
draft-ietf-pce-stateful-sync-optimizations-04

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Document Type Active Internet-Draft (pce WG)
Last updated 2015-11-01
Replaces draft-minei-pce-stateful-sync-optimizations
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PCE Working Group                                              E. Crabbe
Internet-Draft
Intended status: Standards Track                                I. Minei
Expires: May 4, 2016                                        Google, Inc.
                                                               J. Medved
                                                     Cisco Systems, Inc.
                                                                R. Varga
                                               Pantheon Technologies SRO
                                                                X. Zhang
                                                                D. Dhody
                                                     Huawei Technologies
                                                        November 1, 2015

 Optimizations of Label Switched Path State Synchronization Procedures
                           for a Stateful PCE
             draft-ietf-pce-stateful-sync-optimizations-04

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
   reliable state synchronization mechanism between the PCE and the
   network, PCE and path computation clients (PCCs), and between
   cooperating PCEs.  The basic mechanism for state synchronization is
   part of the stateful PCE specification.  This draft presents
   motivations for optimizations to the base state synchronization
   procedure and specifies the required Path Computation Element
   Communication Protocol (PCEP) extensions.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-

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   Drafts is at http://datatracker.ietf.org/drafts/current/.

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   This Internet-Draft will expire on May 4, 2016.

Copyright Notice

   Copyright (c) 2015 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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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  State Synchronization Avoidance  . . . . . . . . . . . . . . .  5
     3.1.  Motivation . . . . . . . . . . . . . . . . . . . . . . . .  5
     3.2.  State Synchronization Avoidance Procedure  . . . . . . . .  5
     3.3.  PCEP Extensions  . . . . . . . . . . . . . . . . . . . . .  9
       3.3.1.  LSP State Database Version Number TLV  . . . . . . . .  9
       3.3.2.  Speaker Entity Identifier TLV  . . . . . . . . . . . . 10
   4.  Incremental State Synchronization  . . . . . . . . . . . . . . 11
     4.1.  Motivation . . . . . . . . . . . . . . . . . . . . . . . . 12
     4.2.  Incremental Synchronization Procedure  . . . . . . . . . . 13
   5.  PCE-triggered Initial Synchronization  . . . . . . . . . . . . 15
     5.1.  Motivation . . . . . . . . . . . . . . . . . . . . . . . . 15
     5.2.  PCE-triggered Initial State Synchronization Procedure  . . 15
   6.  PCE-triggered Re-synchronization . . . . . . . . . . . . . . . 16
     6.1.  Motivation . . . . . . . . . . . . . . . . . . . . . . . . 16
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