PCEP Procedures and Protocol Extensions for Using PCE as a Central Controller (PCECC) for SRv6
draft-dhody-pce-pcep-extension-pce-controller-srv6-00

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PCE Working Group                                               D. Dhody
Internet-Draft                                                     Z. Li
Intended status: Standards Track                     Huawei Technologies
Expires: April 25, 2019                                 October 22, 2018

   PCEP Procedures and Protocol Extensions for Using PCE as a Central
                      Controller (PCECC) for SRv6
         draft-dhody-pce-pcep-extension-pce-controller-srv6-00

Abstract

   The Path Computation Element (PCE) is a core component of Software-
   Defined Networking (SDN) systems.  It can compute optimal paths for
   traffic across a network and can also update the paths to reflect
   changes in the network or traffic demands.

   PCE was developed to derive paths for MPLS Label Switched Paths
   (LSPs), which are supplied to the head end of the LSP using the Path
   Computation Element Communication Protocol (PCEP).  But SDN has a
   broader applicability than signaled (G)MPLS traffic-engineered (TE)
   networks, and the PCE may be used to determine paths in a range of
   use cases.  PCEP has been proposed as a control protocol for use in
   these environments to allow the PCE to be fully enabled as a central
   controller.

   A PCE-based central controller (PCECC) can simplify the processing of
   a distributed control plane by blending it with elements of SDN and
   without necessarily completely replacing it.  This document specifies
   the procedures and PCEP protocol extensions when a PCE-based
   controller is also responsible for configuring the forwarding actions
   on the routers for Segment Routing in IPv6 (SRv6), in addition to
   computing the SRv6 paths for packet flows and telling the edge
   routers what instructions to attach to packets as they enter the
   network.

Status of This Memo

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Dhody & Li               Expires April 25, 2019                 [Page 1]
Internet-Draft                 PCECC-SRv6                   October 2018

   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

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   5
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  PCECC SRv6  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  PCEP Requirements . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Procedures for Using the PCE as the Central Controller
       (PCECC) in SRv6 . . . . . . . . . . . . . . . . . . . . . . .   6
     5.1.  Stateful PCE Model  . . . . . . . . . . . . . . . . . . .   6
     5.2.  New Functions . . . . . . . . . . . . . . . . . . . . . .   6
     5.3.  PCECC Capability Advertisement  . . . . . . . . . . . . .   7
     5.4.  PCEP session IP address and TEDB Router ID  . . . . . . .   7
     5.5.  SRv6 Path Operations  . . . . . . . . . . . . . . . . . .   7
       5.5.1.  PCECC Segment Routing in IPv6 (SRv6)  . . . . . . . .   7
         5.5.1.1.  PCECC SRv6 Node/Prefix SID allocation . . . . . .   7
         5.5.1.2.  PCECC SRv6 Adjacency SID allocation . . . . . . .   8
         5.5.1.3.  Redundant PCEs  . . . . . . . . . . . . . . . . .   9
         5.5.1.4.  Re Delegation and Cleanup . . . . . . . . . . . .   9
         5.5.1.5.  Synchronization of SRv6 SID Allocations . . . . .   9
   6.  PCEP messages . . . . . . . . . . . . . . . . . . . . . . . .   9
   7.  PCEP Objects  . . . . . . . . . . . . . . . . . . . . . . . .   9
     7.1.  OPEN Object . . . . . . . . . . . . . . . . . . . . . . .   9
       7.1.1.  PCECC Capability sub-TLV  . . . . . . . . . . . . . .   9
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