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

Document Type Active Internet-Draft (pce WG)
Last updated 2019-10-11
Replaces draft-li-pce-sr-path-segment
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PCE Working Group                                                  C. Li
Internet-Draft                                                   M. Chen
Intended status: Standards Track                     Huawei Technologies
Expires: April 13, 2020                                         W. Cheng
                                                            China Mobile
                                                               R. Gandhi
                                                     Cisco Systems, Inc.
                                                                Q. Xiong
                                                         ZTE Corporation
                                                        October 11, 2019

  Path Computation Element Communication Protocol (PCEP) Extension for
                  Path Segment in Segment Routing (SR)
                   draft-ietf-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
   Communication Protocol (PCEP) to support requesting, replying,
   reporting and updating the Path Segment ID (Path SID) between PCEP
   speakers.

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
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any

Li, et al.               Expires April 13, 2020                 [Page 1]
Internet-Draft          PCEP for SR Path Segment            October 2019

   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 13, 2020.

Copyright Notice

   Copyright (c) 2019 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   3.  Overview of Path Segment 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.  PCECC-CAPABILITY sub-TLV  . . . . . . . . . . . . . .   6
     4.2.  LSP Object  . . . . . . . . . . . . . . . . . . . . . . .   6
       4.2.1.  Path Segment TLV  . . . . . . . . . . . . . . . . . .   7
     4.3.  FEC Object  . . . . . . . . . . . . . . . . . . . . . . .   8
     4.4.  CCI Object  . . . . . . . . . . . . . . . . . . . . . . .   9
   5.  Operations  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     5.1.  Stateful PCE Operation  . . . . . . . . . . . . . . . . .  10
       5.1.1.  Ingress PCC-Initiated Path Segment Allocation . . . .  10
       5.1.2.  PCE Initiated Path Segment Allocation . . . . . . . .  12
     5.2.  PCECC Based Operation . . . . . . . . . . . . . . . . . .  13
       5.2.1.  PCE Controlled Label Spaces Advertisement . . . . . .  13
       5.2.2.  PCECC based Path Segment Allocation . . . . . . . . .  13
   6.  Dataplane Considerations  . . . . . . . . . . . . . . . . . .  15
   7.  Implementation Status . . . . . . . . . . . . . . . . . . . .  16
     7.1.  Huawei's Commercial Delivery  . . . . . . . . . . . . . .  16
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