PCEP Procedures and Protocol Extensions for Using PCE as a Central Controller (PCECC) for P2MP LSPs
draft-dhody-pce-pcep-extension-pce-controller-p2mp-01

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PCE Working Group                                                M. Negi
Internet-Draft                                                     Z. Li
Intended status: Standards Track                                 X. Geng
Expires: August 22, 2019                             Huawei Technologies
                                                       February 18, 2019

   PCEP Procedures and Protocol Extensions for Using PCE as a Central
                    Controller (PCECC) for P2MP LSPs
         draft-dhody-pce-pcep-extension-pce-controller-p2mp-01

Abstract

   The Path Computation Element (PCE) is a core component of Software-
   Defined Networking (SDN) systems.  It can compute optimal paths for
   traffic across a network and can also update the paths to reflect
   changes in the network or traffic demands.

   The PCE has been identified as an appropriate technology for the
   determination of the paths of point- to-multipoint (P2MP) TE Label
   Switched Paths (LSPs).

   PCE was developed to derive paths for MPLS P2MP LSPs, which are
   supplied to the head end (root) of the LSP using PCEP.  PCEP has been
   proposed as a control protocol to allow the PCE to be fully enabled
   as a central controller.

   A PCE-based central controller (PCECC) can simplify the processing of
   a distributed control plane by blending it with elements of SDN and
   without necessarily completely replacing it.  Thus, the P2MP LSP can
   be calculated/setup/initiated and the label forwarding entries can
   also be downloaded through a centralized PCE server to each network
   devices along the P2MP path while leveraging the existing PCE
   technologies as much as possible.

   This document specifies the procedures and PCEP protocol extensions
   for using the PCE as the central controller for P2MP TE LSP.

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-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

Negi, et al.             Expires August 22, 2019                [Page 1]
Internet-Draft                    PCECC                    February 2019

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 22, 2019.

Copyright Notice

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   5
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Basic PCECC Mode  . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Procedures for Using the PCE as the Central Controller
       (PCECC) for P2MP  . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Stateful PCE Model  . . . . . . . . . . . . . . . . . . .   5
     4.2.  PCECC Capability Advertisement  . . . . . . . . . . . . .   6
     4.3.  LSP Operations  . . . . . . . . . . . . . . . . . . . . .   6
       4.3.1.  Basic PCECC LSP Setup . . . . . . . . . . . . . . . .   6
       4.3.2.  Central Control Instructions  . . . . . . . . . . . .   7
         4.3.2.1.  Label Download  . . . . . . . . . . . . . . . . .   7
         4.3.2.2.  Label Cleanup . . . . . . . . . . . . . . . . . .   8
       4.3.3.  PCE Initiated PCECC LSP . . . . . . . . . . . . . . .   9
       4.3.4.  PCECC LSP Update  . . . . . . . . . . . . . . . . . .   9
       4.3.5.  Re Delegation and Cleanup . . . . . . . . . . . . . .   9
       4.3.6.  Synchronization of Central Controllers Instructions .   9
       4.3.7.  PCECC LSP State Report  . . . . . . . . . . . . . . .   9
   5.  PCEP Objects  . . . . . . . . . . . . . . . . . . . . . . . .  10
     5.1.  OPEN Object . . . . . . . . . . . . . . . . . . . . . . .  10
       5.1.1.  PCECC Capability sub-TLV  . . . . . . . . . . . . . .  10
     5.2.  PATH-SETUP-TYPE TLV . . . . . . . . . . . . . . . . . . .  10