Stateful PCE for SR-MPLS Inter-domain
draft-xiong-pce-stateful-pce-sr-inter-domain-02

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PCE WG                                                        Quan Xiong
Internet-Draft                                               Greg Mirsky
Intended status: Standards Track                         ZTE Corporation
Expires: April 24, 2020                                       Fangwei Hu
                                                              Individual
                                                          Weiqiang Cheng
                                                            China Mobile
                                                        October 22, 2019

                 Stateful PCE for SR-MPLS Inter-domain
            draft-xiong-pce-stateful-pce-sr-inter-domain-02

Abstract

   This document proposes a solution to perform the Segment Routing with
   MPLS data plane (SR-MPLS) inter-domain path computation and
   initiation with stateful PCEs and the use of Path Segments.

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Quan Xiong, et al.       Expires April 24, 2020                 [Page 1]
Internet-Draft    Stateful PCE for SR-MPLS Inter-domain     October 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  The SR-MPLS Inter-domain with Path Segments . . . . . . . . .   3
   3.  Inter-domain Path Segment Allocation  . . . . . . . . . . . .   6
     3.1.  PCC Allocated . . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  PCE Allocated . . . . . . . . . . . . . . . . . . . . . .   7
   4.  PCEP Procedure  . . . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  HPCE-initiated LSP  . . . . . . . . . . . . . . . . . . .   7
     4.2.  PCC-initiated LSP . . . . . . . . . . . . . . . . . . . .   8
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Informative References  . . . . . . . . . . . . . . . . .   9
     8.2.  Normative References  . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   The Path Computation Element (PCE) architecture is defined in
   [RFC4655] for MPLS Traffic Engineering (MPLS-TE) and Generalized MPLS
   (GMPLS) networks.  The Path Computation Element Communication
   Protocol (PCEP) defined in [RFC5440] provides mechanisms for 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 TE paths in segment routing (SR) networks.
   As defined in [I-D.ietf-spring-mpls-path-segment], a path segment is
   used to identify a SR path and support bidirectional SR paths
   correlation.  [I-D.ietf-pce-sr-path-segment] proposed the extension
   for PCEP to operate with Path Segment.  [I-D.li-pce-sr-bidir-path]
   proposed the extension for PCEP to group two unidirectional SR Paths
   into an Associated Bidirectional SR Path.
   [I-D.xiong-spring-path-segment-sr-inter-domain] proposes the use of
   Path Segment in inter-domain scenarios for SR-MPLS network.  It is
   required to perform the SR inter-domain path computation and
   initiation with PCE deployment.

   The path computation requirments for Label Switched Paths (LSPs)
   across multiple domains are discussed in [RFC4105] and [RFC4216].
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