The Use Cases for Path Computation Element (PCE) as a Central Controller (PCECC).

The information below is for an old version of the document
Document Type Active Internet-Draft (teas WG)
Authors Quintin Zhao  , Zhenbin Li  , Boris Khasanov  , Dhruv Dhody  , Zekung Ke , Luyuan Fang  , Chao Zhou  , Telus Communications  , Artem Rachitskiy  , Anton Gulida 
Last updated 2019-03-11
Stream Internet Engineering Task Force (IETF)
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TEAS Working Group                                               Q. Zhao
Internet-Draft                                                     Z. Li
Intended status: Informational                               B. Khasanov
Expires: September 12, 2019                                     D. Dhody
                                                     Huawei Technologies
                                                                   K. Ke
                                                   Tencent Holdings Ltd.
                                                                 L. Fang
                                                           Expedia, Inc.
                                                                 C. Zhou
                                                           Cisco Systems
                                                                B. Zhang
                                                    Telus Communications
                                                           A. Rachitskiy
                                                 Mobile TeleSystems JLLC
                                                               A. Gulida
                                                          LLC "Lifetech"
                                                          March 11, 2019

The Use Cases for Path Computation Element (PCE) as a Central Controller


   The Path Computation Element (PCE) is a core component of a Software-
   Defined Networking (SDN) system.  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).

   SDN has a broader applicability than signaled MPLS traffic-engineered
   (TE) networks, and the PCE may be used to determine paths in a range
   of use cases including static LSPs, segment routing (SR), Service
   Function Chaining (SFC), and most forms of a routed or switched
   network.  It is, therefore, reasonable to consider PCEP as a control
   protocol for use in these environments to allow the PCE to be fully
   enabled as a central controller.

   This document describes general considerations for PCECC deployment
   and examines its applicability and benefits, as well as its
   challenges and limitations, through a number of use cases.  PCEP
   extensions required for stateful PCE usage are covered in separate

Zhao, et al.           Expires September 12, 2019               [Page 1]
Internet-Draft                    PCECC                       March 2019

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "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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   This Internet-Draft will expire on September 12, 2019.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Application Scenarios . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Use Cases of PCECC for Label Management . . . . . . . . .   4
     3.2.  Using PCECC for SR  . . . . . . . . . . . . . . . . . . .   6
       3.2.1.  PCECC SID Allocation  . . . . . . . . . . . . . . . .   7
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