PCEP Extensions for Associated Bidirectional Segment Routing (SR) Paths
draft-li-pce-sr-bidir-path-05

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PCE Working Group                                                  C. Li
Internet-Draft                                                   M. Chen
Intended status: Standards Track                     Huawei Technologies
Expires: September 24, 2019                                     W. Cheng
                                                            China Mobile
                                                                   Z. Li
                                                                 J. Dong
                                                     Huawei Technologies
                                                               R. Gandhi
                                                     Cisco Systems, Inc.
                                                                Q. Xiong
                                                         ZTE Corporation
                                                          March 23, 2019

PCEP Extensions for Associated Bidirectional Segment Routing (SR) Paths
                     draft-li-pce-sr-bidir-path-05

Abstract

   The Path Computation Element Communication Protocol (PCEP) provides
   mechanisms for Path Computation Elements (PCEs) to perform path
   computations in response to Path Computation Clients (PCCs) requests.
   The Stateful PCE extensions allow stateful control of Multiprotocol
   Label Switching (MPLS) Traffic Engineering (TE) Label Switched Paths
   (LSPs) using PCEP.  Furthermore, PCEP can be used for computing paths
   in Segment Routing (SR) TE networks.

   This document defines PCEP extensions for grouping two reverse
   unidirectional SR Paths into an Associated Bidirectional SR Path when
   using a Stateful PCE for both PCE-Initiated and PCC-Initiated LSPs as
   well as when using a Stateless PCE.

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Li, et al.             Expires September 24, 2019               [Page 1]
Internet-Draft    SR Bidirectional Association in PCEP        March 2019

   This Internet-Draft will expire on September 24, 2019.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   3.  PCEP Extension for Bidirectional SR Path  . . . . . . . . . .   4
     3.1.  Double-sided Bidirectional SR Path Association Group
           Object  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Bidirectional Flag  . . . . . . . . . . . . . . . . . . . . .   6
   5.  Procedures for Associated Bidirectional SR Path Computation .   6
     5.1.  PCE Initiated Associated Bidirectional SR Paths . . . . .   7
     5.2.  PCC Initiated Associated Bidirectional SR Paths . . . . .   7
     5.3.  Error Handling  . . . . . . . . . . . . . . . . . . . . .   9
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
     6.1.  Association Type  . . . . . . . . . . . . . . . . . . . .  10
     6.2.  PCEP Errors . . . . . . . . . . . . . . . . . . . . . . .  10
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  11
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  11
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  11
     10.2.  Informative References . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   Segment routing (SR) [RFC8402] leverages the source routing and
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