PCEP Extension for Segment Routing (SR) Bidirectional Associated Paths
draft-li-pce-sr-bidir-path-02

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Last updated 2018-10-22
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PCE Working Group                                                  C. Li
Internet-Draft                                                   M. Chen
Intended status: Standards Track                                D. Dhody
Expires: April 25, 2019                              Huawei Technologies
                                                                W. Cheng
                                                            China Mobile
                                                                   Z. Li
                                                                 J. Dong
                                                     Huawei Technologies
                                                               R. Gandhi
                                                     Cisco Systems, Inc.
                                                        October 22, 2018

 PCEP Extension for Segment Routing (SR) Bidirectional Associated Paths
                     draft-li-pce-sr-bidir-path-02

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 SR 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 April 25, 2019                 [Page 1]
Internet-Draft    SR Bidirectional Association in PCEP      October 2018

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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  . . . . . . . . . . . . . . . . . . . . .   5
   5.  Procedures of Bidirectional Path Computation  . . . . . . . .   6
     5.1.  PCE Initiated SR Paths  . . . . . . . . . . . . . . . . .   6
     5.2.  PCC Initiated SR Paths  . . . . . . . . . . . . . . . . .   7
     5.3.  Error Handling  . . . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
     6.1.  Association Type  . . . . . . . . . . . . . . . . . . . .   9
     6.2.  PCEP Errors . . . . . . . . . . . . . . . . . . . . . . .   9
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  10
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   Segment routing (SR) [RFC8402] leverages the source routing and
   tunneling paradigms.  SR supports to steer packets into an explicit
   forwarding path at the ingress node.

   [RFC5440] describes the Path Computation Element (PCE) Communication
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