PCEP Extension for Segment Routing (SR) Bi-directional Associated Paths
draft-li-pce-sr-bidir-path-01

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PCE Working Group                                                  C. Li
Internet-Draft                                                   M. Chen
Intended status: Standards Track                                D. Dhody
Expires: March 16, 2019                              Huawei Technologies
                                                                W. Cheng
                                                            China Mobile
                                                                   Z. Li
                                                                 J. Dong
                                                     Huawei Technologies
                                                               R. Gandhi
                                                     Cisco Systems, Inc.
                                                      September 12, 2018

PCEP Extension for Segment Routing (SR) Bi-directional Associated Paths
                     draft-li-pce-sr-bidir-path-01

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.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute

Li, et al.               Expires March 16, 2019                 [Page 1]
Internet-Draft    SR Bidirectional Association in PCEP    September 2018

   working documents as Internet-Drafts.  The list of current Internet-
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   This Internet-Draft will expire on March 16, 2019.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  PCEP Extension for Bi-directional SR Path . . . . . . . . . .   4
     3.1.  Double-sided Bidirectional SR Path Association Group
           Object  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Bi-directional Flag . . . . . . . . . . . . . . . . . . . . .   5
   5.  Procedures of Bi-directional 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
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