PCEP Procedures and Protocol Extensions for Using PCE as a Central Controller (PCECC) of LSPs
draft-ietf-pce-pcep-extension-for-pce-controller-00

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Last updated 2018-12-10 (latest revision 2018-11-04)
Replaces draft-zhao-pce-pcep-extension-for-pce-controller
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PCE Working Group                                                Q. Zhao
Internet-Draft                                                     Z. Li
Intended status: Standards Track                                D. Dhody
Expires: May 8, 2019                                      S. Karunanithi
                                                     Huawei Technologies
                                                               A. Farrel
                                                   Juniper Networks, Inc
                                                                 C. Zhou
                                                           Cisco Systems
                                                        November 4, 2018

   PCEP Procedures and Protocol Extensions for Using PCE as a Central
                       Controller (PCECC) of LSPs
          draft-ietf-pce-pcep-extension-for-pce-controller-00

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.

   PCE was developed to derive paths for MPLS Label Switched Paths
   (LSPs), which are supplied to the head end of the LSP using the Path
   Computation Element Communication Protocol (PCEP).  But SDN has a
   broader applicability than signaled (G)MPLS traffic-engineered (TE)
   networks, and the PCE may be used to determine paths in a range of
   use cases.  PCEP has been proposed as a control protocol for use in
   these environments 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 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 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.

Status of This Memo

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

Zhao, et al.               Expires May 8, 2019                  [Page 1]
Internet-Draft                    PCECC                    November 2018

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   This Internet-Draft will expire on May 8, 2019.

Copyright Notice

   Copyright (c) 2018 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   5
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Basic PCECC Mode  . . . . . . . . . . . . . . . . . . . . . .   5
   4.  PCEP Requirements . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Procedures for Using the PCE as the Central Controller
       (PCECC) . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     5.1.  Stateful PCE Model  . . . . . . . . . . . . . . . . . . .   6
     5.2.  New LSP Functions . . . . . . . . . . . . . . . . . . . .   6
     5.3.  PCECC Capability Advertisement  . . . . . . . . . . . . .   7
     5.4.  LSP Operations  . . . . . . . . . . . . . . . . . . . . .   8
       5.4.1.  Basic PCECC LSP Setup . . . . . . . . . . . . . . . .   8
       5.4.2.  Central Control Instructions  . . . . . . . . . . . .  10
         5.4.2.1.  Label Download  . . . . . . . . . . . . . . . . .  10
         5.4.2.2.  Label Cleanup . . . . . . . . . . . . . . . . . .  11
       5.4.3.  PCE Initiated PCECC LSP . . . . . . . . . . . . . . .  12
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