The Use Cases for Path Computation Element (PCE) as a Central Controller (PCECC).
draft-ietf-teas-pcecc-use-cases-04

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TEAS Working Group                                               Q. Zhao
Internet-Draft                                                     Z. Li
Intended status: Informational                               B. Khasanov
Expires: January 5, 2020                                        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"
                                                            July 4, 2019

The Use Cases for Path Computation Element (PCE) as a Central Controller
                                (PCECC).
                   draft-ietf-teas-pcecc-use-cases-04

Abstract

   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
   documents.

Zhao, et al.             Expires January 5, 2020                [Page 1]
Internet-Draft                    PCECC                        July 2019

   This is a living document to catalogue the use cases for PCECC.
   There is currently no intention to publish this work as an RFC.

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.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on January 5, 2020.

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.

Zhao, et al.             Expires January 5, 2020                [Page 2]
Internet-Draft                    PCECC                        July 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4