Path Computation Element Communication Protocol (PCEP) Extension for Path Identification in Segment Routing (SR)
draft-li-pce-sr-path-segment-00

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Last updated 2018-06-20
Replaced by draft-ietf-pce-sr-path-segment
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PCE Working Group                                                  C. Li
Internet-Draft                                                   M. Chen
Intended status: Standards Track                                 J. Dong
Expires: December 22, 2018                                         Z. Li
                                                                D. Dhody
                                                     Huawei Technologies
                                                           June 20, 2018

  Path Computation Element Communication Protocol (PCEP) Extension for
              Path Identification in Segment Routing (SR)
                    draft-li-pce-sr-path-segment-00

Abstract

   The Path Computation Element (PCE) provides path computation
   functions in support of traffic engineering in Multiprotocol Label
   Switching (MPLS) and Generalized MPLS (GMPLS) networks.

   The Source Packet Routing in Networking (SPRING) architecture
   describes how Segment Routing (SR) can be used to steer packets
   through an IPv6 or MPLS network using the source routing paradigm.  A
   Segment Routed Path can be derived from a variety of mechanisms,
   including an IGP Shortest Path Tree (SPT), explicit configuration, or
   a Path Computation Element (PCE).

   Path identification is needed for several use cases such as
   performance measurement in Segment Routing (SR) network.  This
   document specifies extensions to the Path Computation Element
   Protocol (PCEP) to support requesting, replying, reporting and
   updating the path identifier between PCEP speakers.

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 December 22, 2018               [Page 1]
Internet-Draft               Path ID in PCEP                   June 2018

   working documents as Internet-Drafts.  The list of current Internet-
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   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on December 22, 2018.

Copyright Notice

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

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Overview of Path ID Extensions in PCEP  . . . . . . . . . . .   4
   4.  Objects and TLVs  . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  The OPEN Object . . . . . . . . . . . . . . . . . . . . .   5
       4.1.1.  The SR PCE Capability sub-TLV . . . . . . . . . . . .   5
       4.1.2.  The SRv6 PCE Capability sub-TLV . . . . . . . . . . .   5
       4.1.3.  PCECC-CAPABILITY sub-TLV  . . . . . . . . . . . . . .   5
     4.2.  LSP Object  . . . . . . . . . . . . . . . . . . . . . . .   6
       4.2.1.  Path ID TLV . . . . . . . . . . . . . . . . . . . . .   6
     4.3.  FEC Object  . . . . . . . . . . . . . . . . . . . . . . .   8
     4.4.  CCI Object  . . . . . . . . . . . . . . . . . . . . . . .   9
   5.  Operations  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  PCC Allocated Path ID . . . . . . . . . . . . . . . . . .   9
       5.1.1.  Ingress PCC Allocated Path ID . . . . . . . . . . . .   9
     5.2.  PCE Allocated Path ID . . . . . . . . . . . . . . . . . .  10
       5.2.1.  PCE Controlled ID Spaces Advertisement  . . . . . . .  10
       5.2.2.  Ingress PCC request Path ID to PCE  . . . . . . . . .  10
       5.2.3.  PCE allocated Path ID on its own  . . . . . . . . . .  11
     5.3.  Two Label Solution  . . . . . . . . . . . . . . . . . . .  12
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
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