PCEP extensions for SR MPLS-TP
draft-xiong-pce-pcep-extension-sr-tp-02

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PCE WG                                                        Quan Xiong
Internet-Draft                                                Fangwei Hu
Intended status: Standards Track                         Shuangping Zhan
Expires: April 25, 2019                                  ZTE Corporation
                                                        October 22, 2018

                     PCEP extensions for SR MPLS-TP
                draft-xiong-pce-pcep-extension-sr-tp-02

Abstract

   This document proposes a set of extensions to PCEP for Segment
   Routing in MPLS Transport Profile (MPLS-TP) networks and defines a
   mechanism to create the bi-directional SR tunnel in SR networks with
   PCE.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  The SR MPLS-TP Architecture with PCE  . . . . . . . . . . . .   3
     2.1.  SR Path SID Allocation  . . . . . . . . . . . . . . . . .   4
     2.2.  Associated Bi-directional SR tunnel . . . . . . . . . . .   5
   3.  PCEP extensions for SR MPLS-TP  . . . . . . . . . . . . . . .   6
     3.1.  ERO extension . . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  E bit in LSP object . . . . . . . . . . . . . . . . . . .   7
     3.3.  Processing Rules  . . . . . . . . . . . . . . . . . . . .   7
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     7.1.  Informative References  . . . . . . . . . . . . . . . . .   8
     7.2.  Normative References  . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   The Path Computation Element Communication Protocol (PCEP) defined in
   [RFC5440] provides mechanisms for Path Computation Elements (PCEs) to
   perform path computations in response to Path Computation Clients
   (PCCs) requests.

   [I-D.ietf-pce-segment-routing] proposes extensions to PCEP that allow
   a stateful PCE to compute Traffic Engineering (TE) paths in segment
   routing (SR) networks.  But it is applicable to Multi-protocol Label
   Switching (MPLS) networks.  [I-D.hu-spring-sr-tp-use-case] describes
   the use case of SR tunnel to be deployed in MPLS Transport Profile
   (MPLS-TP) network.  It is required to extend the PCEP protocol to
   meet the new requirements for SR MPLS-TP services.  One of the
   requirements is the bidirectional SR tunnel described in
   [I-D.cheng-spring-mpls-path-segment].

   This document proposes a set of extensions to PCEP for Segment
   Routing in MPLS Transport Profile networks and defines a mechanism to
   create the bidirectional SR tunnel in SR networks with PCE.

1.1.  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 [RFC2119].

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1.2.  Terminology

   The terminology is defined as [RFC5440],
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