PCEP Extensions for Segment Routing
draft-ietf-pce-segment-routing-08

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Last updated 2016-10-04
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Network Working Group                                       S. Sivabalan
Internet-Draft                                                 J. Medved
Intended status: Standards Track                             C. Filsfils
Expires: April 7, 2017                               Cisco Systems, Inc.
                                                               E. Crabbe
                                                                  Oracle
                                                               R. Raszuk
                                                           Mirantis Inc.
                                                                V. Lopez
                                                          Telefonica I+D
                                                             J. Tantsura
                                                              Individual
                                                           W. Henderickx
                                                                   Nokia
                                                             J. Hardwick
                                                     Metaswitch Networks
                                                         October 4, 2016

                  PCEP Extensions for Segment Routing
                   draft-ietf-pce-segment-routing-08

Abstract

   Segment Routing (SR) enables any head-end node to select any path
   without relying on a hop-by-hop signaling technique (e.g., LDP or
   RSVP-TE).  It depends only on "segments" that are advertised by Link-
   State Interior Gateway Protocols (IGPs).  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).  This document specifies extensions to the Path
   Computation Element Protocol (PCEP) that allow a stateful PCE to
   compute and initiate Traffic Engineering (TE) paths, as well as a PCC
   to request a path subject to certain constraint(s) and optimization
   criteria in SR networks.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

Status of This Memo

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

Sivabalan, et al.         Expires April 7, 2017                 [Page 1]
Internet-Draft     PCEP Extensions for Segment Routing      October 2016

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   This Internet-Draft will expire on April 7, 2017.

Copyright Notice

   Copyright (c) 2016 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
   (http://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
   3.  Overview of PCEP Operation in SR Networks . . . . . . . . . .   5
   4.  SR-Specific PCEP Message Extensions . . . . . . . . . . . . .   7
   5.  Object Formats  . . . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  The OPEN Object . . . . . . . . . . . . . . . . . . . . .   7
       5.1.1.  The SR PCE Capability TLV . . . . . . . . . . . . . .   7
     5.2.  The RP/SRP Object . . . . . . . . . . . . . . . . . . . .   9
     5.3.  ERO Object  . . . . . . . . . . . . . . . . . . . . . . .   9
       5.3.1.  SR-ERO Subobject  . . . . . . . . . . . . . . . . . .   9
       5.3.2.  NAI Associated with SID . . . . . . . . . . . . . . .  11
       5.3.3.  ERO Processing  . . . . . . . . . . . . . . . . . . .  13
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