PCEP Procedures and Protocol Extensions for Using PCE as a Central Controller (PCECC) of LSPs
draft-ietf-pce-pcep-extension-for-pce-controller-07

Document Type Active Internet-Draft (pce WG)
Authors Zhenbin Li  , Shuping Peng  , Mahendra Negi  , Quintin Zhao  , Chao Zhou 
Last updated 2020-09-24 (latest revision 2020-09-01)
Replaces draft-zhao-pce-pcep-extension-for-pce-controller
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Document shepherd Julien Meuric
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Send notices to Julien Meuric <julien.meuric@orange.com>
PCE Working Group                                                  Z. Li
Internet-Draft                                                   S. Peng
Intended status: Standards Track                     Huawei Technologies
Expires: March 5, 2021                                           M. Negi
                                                           RtBrick India
                                                                 Q. Zhao
                                                        Etheric Networks
                                                                 C. Zhou
                                                                     HPE
                                                       September 1, 2020

   PCEP Procedures and Protocol Extensions for Using PCE as a Central
                       Controller (PCECC) of LSPs
          draft-ietf-pce-pcep-extension-for-pce-controller-07

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 MPLS and GMPLS 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 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.

Li, et al.                Expires March 5, 2021                 [Page 1]
Internet-Draft                    PCECC                   September 2020

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   This Internet-Draft will expire on March 5, 2021.

Copyright Notice

   Copyright (c) 2020 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 . . . . . . . . . . . . . . . . . . . . . .   6
   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.  New PCEP Object . . . . . . . . . . . . . . . . . . . . .   7
     5.4.  PCECC Capability Advertisement  . . . . . . . . . . . . .   7
     5.5.  LSP Operations  . . . . . . . . . . . . . . . . . . . . .   8
       5.5.1.  Basic PCECC LSP set up  . . . . . . . . . . . . . . .   8
       5.5.2.  Central Controller Instructions . . . . . . . . . . .  12
         5.5.2.1.  Label Download CCI  . . . . . . . . . . . . . . .  12
         5.5.2.2.  Label Cleanup CCI . . . . . . . . . . . . . . . .  12
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