PCEP Extensions for Unifed Source Routing-based SFC
draft-xu-pce-sr-sfc-05

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PCE Working Group                                                  X. Xu
Internet-Draft                                                    Huawei
Intended status: Standards Track                                  J. You
Expires: January 4, 2018
                                                            S. Sivabalan
                                                                   Cisco
                                                                 H. Shah
                                                                   Ciena
                                                            L. Contreras
                                                          Telefonica I+D
                                                              D. Bernier
                                                             Bell Canada
                                                                   S. Ma
                                                                 Juniper
                                                            July 3, 2017

          PCEP Extensions for Unifed Source Routing-based SFC
                         draft-xu-pce-sr-sfc-05

Abstract

   MPLS-SPRING (a.k.a., MPLS Segment Routing) could be leveraged to
   realize a unified source routing mechanism across MPLS, IPv4 and IPv6
   data planes by using a unified source routing instruction set while
   preserving backward compatibility with MPLS-SPRING.  More
   specifically, the source routing instruction set information
   contained in a source routed packet could be uniformly encoded as an
   MPLS label stack no matter the underlay is IPv4, IPv6 or MPLS.  The
   unified source routing mechanism could be leveraged to realize a
   transport-independent service function chaining by encoding the
   service function path information or service function chain
   information as an MPLS label stack.  This document describes
   extensions to the Path Computation Element Protocol (PCEP) that allow
   a PCE to compute and instantiate service function paths in the unifed
   source routing based service function chaining context.  The
   extensions specified in this document are applicable to both the
   stateless PCE model and the stateful PCE model.

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 RFC 2119 [RFC2119].

Xu, et al.               Expires January 4, 2018                [Page 1]
Internet-Draft                                                 July 2017

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   Copyright (c) 2017 IETF Trust and the persons identified as the
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  PCEP Message Extensions for MPLS Source Routing-based SFC . .   5
     3.1.  PCReq Message . . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  PCRep Message . . . . . . . . . . . . . . . . . . . . . .   5
     3.3.  PCUpd Message . . . . . . . . . . . . . . . . . . . . . .   6
     3.4.  PCRpt Message . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Object Formats  . . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  OPEN Object . . . . . . . . . . . . . . . . . . . . . . .   6
       4.1.1.  SR-SFC PCE Capability TLV . . . . . . . . . . . . . .   6
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