PCEP Extensions for Segment Routing leveraging the IPv6 data plane
draft-ietf-pce-segment-routing-ipv6-02

Document Type Active Internet-Draft (pce WG)
Last updated 2019-04-07
Replaces draft-negi-pce-segment-routing-ipv6
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PCE Working Group                                                M. Negi
Internet-Draft                                                     C. Li
Intended status: Standards Track                     Huawei Technologies
Expires: October 10, 2019                                   S. Sivabalan
                                                           Cisco Systems
                                                           P. Kaladharan
                                                             RtBrick Inc
                                                             Z. Yongqing
                                                           China Telecom
                                                           April 8, 2019

   PCEP Extensions for Segment Routing leveraging the IPv6 data plane
                 draft-ietf-pce-segment-routing-ipv6-02

Abstract

   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.
   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
   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).

   Since SR can be applied to both MPLS and IPv6 forwarding plane, a PCE
   should be able to compute SR-Path for both MPLS and IPv6 forwarding
   plane.  This document describes the extensions required for SR
   support for IPv6 data plane in Path Computation Element communication
   Protocol (PCEP).  The PCEP extension and mechanism to support SR-MPLS
   is described in [I-D.ietf-pce-segment-routing].  This document
   extends it to support SRv6 (SR over IPv6).

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.

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Status of This Memo

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

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   This Internet-Draft will expire on October 10, 2019.

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
   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 . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Overview of PCEP Operation in SRv6 Networks . . . . . . . . .   5
     3.1.  Operation Overview  . . . . . . . . . . . . . . . . . . .   6
     3.2.  SRv6-Specific PCEP Message Extensions . . . . . . . . . .   6
   4.  Object Formats  . . . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  The OPEN Object . . . . . . . . . . . . . . . . . . . . .   7
       4.1.1.  The SRv6 PCE Capability sub-TLV . . . . . . . . . . .   7
     4.2.  The RP/SRP Object . . . . . . . . . . . . . . . . . . . .   8
     4.3.  ERO . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
       4.3.1.  SRv6-ERO Subobject  . . . . . . . . . . . . . . . . .   8
     4.4.  RRO . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
       4.4.1.  SRv6-RRO Subobject  . . . . . . . . . . . . . . . . .  11
   5.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .  11

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