An Architecture for Use of PCE and PCEP in a Network with Central Control
draft-ietf-teas-pce-central-control-02

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Last updated 2017-05-14
Replaces draft-zhao-teas-pce-control-function
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TEAS Working Group                                        A. Farrel, Ed.
Internet-Draft                                          Juniper Networks
Intended status: Informational                              Q. Zhao, Ed.
Expires: November 15, 2017                                         R. Li
                                                     Huawei Technologies
                                                                 C. Zhou
                                                           Cisco Systems
                                                            May 14, 2017

   An Architecture for Use of PCE and PCEP in a Network with Central
                                Control
                 draft-ietf-teas-pce-central-control-02

Abstract

   The Path Computation Element (PCE) has become established as a core
   component of Software Defined Networking (SDN) systems.  It can
   compute optimal paths for traffic across a network for any definition
   of "optimal" and can also monitor changes in resource availability
   and traffic demands to update the paths.

   Conventionally, the PCE has been used to derive paths for MPLS Label
   Switched Paths (LSPs).  These paths are supplied using the Path
   Computation Element Communication Protocol (PCEP) to the head end of
   the LSP for signaling in the MPLS network.

   SDN has a far broader applicability than just signaled MPLS traffic
   engineered networks, and the PCE may be used to determine paths in a
   wide range of use cases including static LSPs, segment routing,
   service function chaining (SFC), and indeed any form of routed or
   switched network.  It is, therefore, reasonable to consider PCEP as a
   general southbound control protocol for use in these environments to
   allow the PCE to be fully enabled as a central controller.

   This document briefly introduces the architecture for PCE as a
   central controller, examines the motivations and applicability for
   PCEP as a southbound interface, and introduces the implications for
   the protocol.  This document does not describe the use cases in
   detail and does not define protocol extensions: that work is left for
   other documents.

Status of This Memo

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

Farrel, et al.          Expires November 15, 2017               [Page 1]
Internet-Draft             PCE-CC Architecture                  May 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Architecture  . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Resilience and Scaling  . . . . . . . . . . . . . . . . .   7
       2.1.1.  Partitioned Network . . . . . . . . . . . . . . . . .   8
       2.1.2.  Multiple Parallel Controllers . . . . . . . . . . . .   9
       2.1.3.  Hierarchical Controllers  . . . . . . . . . . . . . .  10
   3.  Applicability . . . . . . . . . . . . . . . . . . . . . . . .  11
     3.1.  Technology-Oriented Applicability . . . . . . . . . . . .  12
       3.1.1.  Applicability to Control Plane Operated Networks  . .  12
       3.1.2.  Static LSPs in MPLS . . . . . . . . . . . . . . . . .  12
       3.1.3.  MPLS Multicast  . . . . . . . . . . . . . . . . . . .  13
       3.1.4.  Transport SDN . . . . . . . . . . . . . . . . . . . .  13
       3.1.5.  Segment Routing . . . . . . . . . . . . . . . . . . .  13
       3.1.6.  Service Function Chaining . . . . . . . . . . . . . .  14
     3.2.  High-Level Applicability  . . . . . . . . . . . . . . . .  14
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