PCEP Extension for SRv6 Unified SIDs
draft-xiong-pce-segment-routing-ipv6-complement-01

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PCE                                                             Q. Xiong
Internet-Draft                                                   S. Peng
Intended status: Standards Track                         ZTE Corporation
Expires: September 29, 2020                               March 28, 2020

                  PCEP Extension for SRv6 Unified SIDs
           draft-xiong-pce-segment-routing-ipv6-complement-01

Abstract

   This document proposes PCEP extensions for SRv6 Path (i.e.  ERO)
   which applied to the use of SRv6 Unified SIDs.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on September 29, 2020.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  PCEP Extensions for SRv6 Unified SIDs . . . . . . . . . . . .   3
     3.1.  The OPEN Object . . . . . . . . . . . . . . . . . . . . .   3
     3.2.  The ERO Object  . . . . . . . . . . . . . . . . . . . . .   4
   4.  Operations  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
     7.1.  New SR PCE Capability Flag Registry . . . . . . . . . . .   5
     7.2.  Extension for SRv6-ERO Registry . . . . . . . . . . . . .   6
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   [RFC5440] describes the Path Computation Element Protocol (PCEP)
   which is used between a Path Computation Element (PCE) and a Path
   Computation Client (PCC) (or other PCE) to enable computation of
   Multi-protocol Label Switching (MPLS) for Traffic Engineering Label
   Switched Path (TE LSP).  PCEP Extensions for the Stateful PCE Model
   [RFC8231] describes a set of extensions to PCEP to enable active
   control of MPLS-TE and Generalized MPLS (GMPLS) tunnels.  [RFC8281]
   describes the setup and teardown of PCE-initiated LSPs under the
   active stateful PCE model, without the need for local configuration
   on the PCC, thus allowing for dynamic centralized control of a
   network.

   Segment Routing (SR) leverages the source routing paradigm.  Segment
   Routing can be instantiated on MPLS data plane which is referred to
   as SR-MPLS [RFC8660].  SR-MPLS leverages the MPLS label stack to
   construct the SR path.  PCEP Extensions for Segment Routing [RFC8664]
   specifies extensions to the PCEP that allow a stateful PCE to compute
   and initiate TE paths in SR networks.  Segment Routing can be applied
   to the IPv6 architecture which is called SRv6 with the Segment
   Routing Header (SRH) [I-D.ietf-6man-segment-routing-header].
   [I-D.ietf-pce-segment-routing-ipv6] extends the PCEP to support SRv6.

   [I-D.ietf-spring-srv6-network-programming] proposes the SRv6 Network
   Programming to specify a packet processing program by encoding a
   sequence of instructions in the IPv6 packet header.  It defined the
   SID as two parts, LOC:FUNCT or a complete structure is
   BLOCK:NODE:FUNCT:ARGS.  However, the size of SRv6 SID faces a scaling
   challenge to use topological instructions.

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