Path Computation Element Communication Protocol (PCEP) Extension for Path Segment in Segment Routing (SR)
draft-li-pce-sr-path-segment-03

Document Type Active Internet-Draft (individual)
Last updated 2018-10-22
Stream (None)
Intended RFC status (None)
Formats plain text xml pdf html bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
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
                                                                 J. Dong
                                                                   Z. Li
                                                     Huawei Technologies
                                                               R. Gandhi
                                                     Cisco Systems, Inc.
                                                        October 22, 2018

  Path Computation Element Communication Protocol (PCEP) Extension for
                  Path Segment in Segment Routing (SR)
                    draft-li-pce-sr-path-segment-03

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 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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

Li, et al.               Expires April 25, 2019                 [Page 1]
Internet-Draft          PCEP for SR Path Segment            October 2018

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   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 25, 2019.

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
   to this document.  Code Components extracted from this document must
   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
     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.  The SRv6 PCE Capability sub-TLV . . . . . . . . . . .   6
       4.1.3.  PCECC-CAPABILITY sub-TLV  . . . . . . . . . . . . . .   6
     4.2.  LSP Object  . . . . . . . . . . . . . . . . . . . . . . .   7
       4.2.1.  Path Segment TLV  . . . . . . . . . . . . . . . . . .   7
     4.3.  FEC Object  . . . . . . . . . . . . . . . . . . . . . . .   9
     4.4.  CCI Object  . . . . . . . . . . . . . . . . . . . . . . .  10
   5.  Operations  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     5.1.  PCC Allocated Path Segment  . . . . . . . . . . . . . . .  11
       5.1.1.  Egress PCC Allocated Path Segment . . . . . . . . . .  11
     5.2.  PCE Allocated Path Segment  . . . . . . . . . . . . . . .  15
       5.2.1.  PCE Controlled Label Spaces Advertisement . . . . . .  15
       5.2.2.  Ingress PCC request Path Segment to PCE . . . . . . .  15
       5.2.3.  PCE allocated Path Segment on its own . . . . . . . .  16
Show full document text