RIFT Applicability
draft-wei-rift-applicability-01

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RIFT WG                                                      Yuehua. Wei
Internet-Draft                                              Zheng. Zhang
Intended status: Standards Track                         ZTE Corporation
Expires: December 21, 2019                             Dmitry. Afanasiev
                                                                  Yandex
                                                            Tom. Verhaeg
                                              Interconnect Services B.V.
                                                     Jaroslaw. Kowalczyk
                                                           Orange Polska
                                                           June 19, 2019

                           RIFT Applicability
                    draft-wei-rift-applicability-01

Abstract

   This document discusses the properties and applicability of RIFT in
   different network topologies.  It intends to provide a rough guide
   how RIFT can be deployed to simplify routing operations in Clos
   topologies and their variations.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on December 21, 2019.

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

Wei, et al.             Expires December 21, 2019               [Page 1]
Internet-Draft        RIFT Applicability Statement             June 2019

   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Problem statement of a Fat Tree network in modern IP fabric .   2
   3.  Why ritf is chosen to address this use case . . . . . . . . .   3
     3.1.  Overview of RIFT  . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Applicable Topologies . . . . . . . . . . . . . . . . . .   5
       3.2.1.  Horizontal Links  . . . . . . . . . . . . . . . . . .   5
       3.2.2.  Vertical Shortcuts  . . . . . . . . . . . . . . . . .   6
     3.3.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . .   6
       3.3.1.  DC Fabrics  . . . . . . . . . . . . . . . . . . . . .   6
       3.3.2.  Metro Fabrics . . . . . . . . . . . . . . . . . . . .   6
       3.3.3.  Building Cabling  . . . . . . . . . . . . . . . . . .   6
       3.3.4.  Internal Router Switching Fabrics . . . . . . . . . .   7
       3.3.5.  CloudCO . . . . . . . . . . . . . . . . . . . . . . .   7
   4.  Operational Simplifications and Considerations  . . . . . . .   9
     4.1.  Automatic Disaggregation  . . . . . . . . . . . . . . . .  10
       4.1.1.  South reflection  . . . . . . . . . . . . . . . . . .  10
       4.1.2.  Suboptimal routing upon link failure use case . . . .  10
       4.1.3.  Black-holing upon link failure use case . . . . . . .  12
     4.2.  Usage of ZTP  . . . . . . . . . . . . . . . . . . . . . .  13
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   6.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  13
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   This document intends to explain the properties and applicability of
   RIFT [I-D.ietf-rift-rift] in different deployment scenarios and
   highlight the operational simplicity of the technology compared to
   traditional routing solutions.

2.  Problem statement of a Fat Tree network in modern IP fabric

   Clos and Fat-Tree topologies have gained prominence in today's
   networking, primarily as result of the paradigm shift towards a
   centralized data-center based architecture that is poised to deliver
   a majority of computation and storage services in the future.

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