Scenarios and Simulation Results of PCE in a Native IP Network
RFC 8735

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Internet Engineering Task Force (IETF)                           A. Wang
Request for Comments: 8735                                 China Telecom
Category: Informational                                         X. Huang
ISSN: 2070-1721                                                   C. Kou
                                                                    BUPT
                                                                   Z. Li
                                                            China Mobile
                                                                   P. Mi
                                                     Huawei Technologies
                                                           February 2020

     Scenarios and Simulation Results of PCE in a Native IP Network

Abstract

   Requirements for providing the End-to-End (E2E) performance assurance
   are emerging within the service provider networks.  While there are
   various technology solutions, there is no single solution that can
   fulfill these requirements for a native IP network.  In particular,
   there is a need for a universal E2E solution that can cover both
   intra- and inter-domain scenarios.

   One feasible E2E traffic-engineering solution is the addition of
   central control in a native IP network.  This document describes
   various complex scenarios and simulation results when applying the
   Path Computation Element (PCE) in a native IP network.  This
   solution, referred to as Centralized Control Dynamic Routing (CCDR),
   integrates the advantage of using distributed protocols and the power
   of a centralized control technology, providing traffic engineering
   for native IP networks in a manner that applies equally to intra- and
   inter-domain scenarios.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are candidates for any level of Internet
   Standard; see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8735.

Copyright Notice

   Copyright (c) 2020 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
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Table of Contents

   1.  Introduction
   2.  Terminology
   3.  CCDR Scenarios
     3.1.  QoS Assurance for Hybrid Cloud-Based Application
     3.2.  Link Utilization Maximization
     3.3.  Traffic Engineering for Multi-domain
     3.4.  Network Temporal Congestion Elimination
   4.  CCDR Simulation
     4.1.  Case Study for CCDR Algorithm
     4.2.  Topology Simulation
     4.3.  Traffic Matrix Simulation
     4.4.  CCDR End-to-End Path Optimization
     4.5.  Network Temporal Congestion Elimination
   5.  CCDR Deployment Consideration
   6.  Security Considerations
   7.  IANA Considerations
   8.  References
     8.1.  Normative References
     8.2.  Informative References
   Acknowledgements
   Contributors
   Authors' Addresses

1.  Introduction

   A service provider network is composed of thousands of routers that
   run distributed protocols to exchange reachability information.  The
   path for the destination network is mainly calculated, and
   controlled, by the distributed protocols.  These distributed
   protocols are robust enough to support most applications; however,
   they have some difficulties supporting the complexities needed for
   traffic-engineering applications, e.g., E2E performance assurance, or
   maximizing the link utilization within an IP network.

   Multiprotocol Label Switching (MPLS) using Traffic-Engineering (TE)
   technology (MPLS-TE) [RFC3209] is one solution for TE networks, but
   it introduces an MPLS network along with related technology, which
   would be an overlay of the IP network.  MPLS-TE technology is often
   used for Label Switched Path (LSP) protection and setting up complex
   paths within a domain.  It has not been widely deployed for meeting
   E2E (especially in inter-domain) dynamic performance assurance
   requirements for an IP network.