PCEP Extensions for Segment Routing
draft-ietf-pce-segment-routing-11

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Last updated 2017-11-20
Replaces draft-sivabalan-pce-segment-routing
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PCE                                                         S. Sivabalan
Internet-Draft                                               C. Filsfils
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: May 24, 2018                                        J. Tantsura
                                                              Individual
                                                           W. Henderickx
                                                                   Nokia
                                                             J. Hardwick
                                                     Metaswitch Networks
                                                       November 20, 2017

                  PCEP Extensions for Segment Routing
                   draft-ietf-pce-segment-routing-11

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.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any

Sivabalan, et al.         Expires May 24, 2018                  [Page 1]
Internet-Draft     PCEP Extensions for Segment Routing     November 2017

   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 May 24, 2018.

Copyright Notice

   Copyright (c) 2017 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 . . . . . . . . . . . . .   6
   5.  Object Formats  . . . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  The OPEN Object . . . . . . . . . . . . . . . . . . . . .   7
       5.1.1.  The SR PCE Capability sub-TLV . . . . . . . . . . . .   7
       5.1.2.  Exchanging the SR PCE Capability  . . . . . . . . . .   8
     5.2.  The RP/SRP Object . . . . . . . . . . . . . . . . . . . .   9
     5.3.  ERO Object  . . . . . . . . . . . . . . . . . . . . . . .   9
       5.3.1.  SR-ERO Subobject  . . . . . . . . . . . . . . . . . .  10
       5.3.2.  NAI Associated with SID . . . . . . . . . . . . . . .  12
       5.3.3.  ERO Processing  . . . . . . . . . . . . . . . . . . .  13
     5.4.  RRO Object  . . . . . . . . . . . . . . . . . . . . . . .  14
       5.4.1.  RRO Processing  . . . . . . . . . . . . . . . . . . .  14
     5.5.  METRIC Object . . . . . . . . . . . . . . . . . . . . . .  15
   6.  Backward Compatibility  . . . . . . . . . . . . . . . . . . .  15
   7.  Management Considerations . . . . . . . . . . . . . . . . . .  16
     7.1.  Policy  . . . . . . . . . . . . . . . . . . . . . . . . .  16
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