PCEP Procedures and Protocol Extensions for Using PCE as a Central Controller (PCECC) of LSPs
draft-zhao-pce-pcep-extension-for-pce-controller-04

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PCE Working Group                                                Q. Zhao
Internet-Draft                                                     Z. Li
Intended status: Experimental                                   D. Dhody
Expires: August 3, 2017                              Huawei Technologies
                                                                 C. Zhou
                                                           Cisco Systems
                                                        January 30, 2017

   PCEP Procedures and Protocol Extensions for Using PCE as a Central
                       Controller (PCECC) of LSPs
          draft-zhao-pce-pcep-extension-for-pce-controller-04

Abstract

   In certain networks deployment scenarios, service providers would
   like to keep all the existing MPLS functionalities in both MPLS and
   GMPLS while removing the complexity of existing signalling protocols
   such as LDP and RSVP-TE.  In
   [I-D.zhao-pce-central-controller-user-cases], we propose to use the
   PCE [RFC5440] as a central controller (PCECC) so that LSP can be
   calculated/ signalled/initiated and label forwarding entries are
   downloaded through a centralized PCE server to each network devices
   along the LSP path while leveraging the existing PCE technologies as
   much as possible.

   This draft specify the procedures and PCEP protocol extensions for
   using the PCE as the central controller and user cases where LSPs are
   calculated/setup/initiated and label forwarding entries are
   downloaded through extending the existing PCE architectures and PCEP.

   This document also discuss the role of PCECC in Segment Routing (SR).

Status of This Memo

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Zhao, et al.             Expires August 3, 2017                 [Page 1]
Internet-Draft                    PCECC                     January 2017

   This Internet-Draft will expire on August 3, 2017.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   5
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  PCECC Modes . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  PCEP Requirements . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Procedures for Using the PCE as the Central Controller
       (PCECC) . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  Stateful PCE Model  . . . . . . . . . . . . . . . . . . .   7
     5.2.  New LSP Functions . . . . . . . . . . . . . . . . . . . .   7
     5.3.  PCECC Capability Advertisement  . . . . . . . . . . . . .   8
     5.4.  PCEP session IP address and TEDB Router ID  . . . . . . .   9
     5.5.  LSP Operations  . . . . . . . . . . . . . . . . . . . . .   9
       5.5.1.  Basic PCECC Mode  . . . . . . . . . . . . . . . . . .   9
         5.5.1.1.  PCECC LSP Setup . . . . . . . . . . . . . . . . .   9
         5.5.1.2.  Label Operations  . . . . . . . . . . . . . . . .  11
       5.5.2.  PCE Initiated PCECC LSP . . . . . . . . . . . . . . .  14
       5.5.3.  PCECC LSP Update  . . . . . . . . . . . . . . . . . .  16
       5.5.4.  PCECC LSP State Report  . . . . . . . . . . . . . . .  19
       5.5.5.  PCECC Segment Routing (SR)  . . . . . . . . . . . . .  19
         5.5.5.1.  PCECC SR-BE . . . . . . . . . . . . . . . . . . .  19
         5.5.5.2.  PCECC SR-TE . . . . . . . . . . . . . . . . . . .  20
   6.  PCEP messages . . . . . . . . . . . . . . . . . . . . . . . .  21
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