PCEP extensions for SR-MPLS-TP
draft-xiong-pce-pcep-extension-sr-tp-03

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PCE WG                                                        Quan Xiong
Internet-Draft                                           Shuangping Zhan
Intended status: Standards Track                         ZTE Corporation
Expires: September 12, 2019                                   Fangwei Hu
                                                              Individual
                                                          March 11, 2019

                     PCEP extensions for SR-MPLS-TP
                draft-xiong-pce-pcep-extension-sr-tp-03

Abstract

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

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   This Internet-Draft will expire on September 12, 2019.

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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  . . . . . . . . . . . . . . . . .   5
     2.2.  Associated Bi-directional SR tunnel . . . . . . . . . . .   6
   3.  PCEP extensions for SR-MPLS-TP  . . . . . . . . . . . . . . .   7
     3.1.  ERO extension . . . . . . . . . . . . . . . . . . . . . .   8
     3.2.  E bit in LSP object . . . . . . . . . . . . . . . . . . .   9
     3.3.  Processing Rules  . . . . . . . . . . . . . . . . . . . .   9
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

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 refered as to SR-MPLS.  In the context of
   the Transport Profile of SR-MPLS, referred to in this document as SR-
   MPLS-TP, a Path Segment uniquely identifies an SR path in a specific
   context.  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.ietf-spring-mpls-path-segment].

   This document proposes a set of extensions to PCEP for SR-MPLS-TP
   networks and defines a mechanism to create the bidirectional SR
   tunnel 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],
   [I-D.ietf-pce-segment-routing] and
   [I-D.ietf-spring-mpls-path-segment].
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