RIFT Applicability
draft-ietf-rift-applicability-03

Document Type Active Internet-Draft (rift WG)
Authors Yuehua Wei  , Zheng Zhang  , Dmitry Afanasiev  , Tom Verhaeg  , Jaroslaw Kowalczyk  , Pascal Thubert 
Last updated 2020-10-13
Replaces draft-wei-rift-applicability
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RIFT WG                                                 Yuehua. Wei, Ed.
Internet-Draft                                              Zheng. Zhang
Intended status: Informational                           ZTE Corporation
Expires: 16 April 2021                                 Dmitry. Afanasiev
                                                                  Yandex
                                                            Tom. Verhaeg
                                                        Juniper Networks
                                                     Jaroslaw. Kowalczyk
                                                           Orange Polska
                                                              P. Thubert
                                                           Cisco Systems
                                                         13 October 2020

                           RIFT Applicability
                    draft-ietf-rift-applicability-03

Abstract

   This document discusses the properties, applicability and operational
   considerations of RIFT in different network scenarios.  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
   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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 16 April 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Wei, et al.               Expires 16 April 2021                 [Page 1]
Internet-Draft        RIFT Applicability Statement          October 2020

   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 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  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Problem Statement of Routing in Modern IP Fabric Fat Tree
           Networks  . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Applicability of RIFT to Clos IP Fabrics  . . . . . . . . . .   3
     3.1.  Overview of RIFT  . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Applicable Topologies . . . . . . . . . . . . . . . . . .   6
       3.2.1.  Horizontal Links  . . . . . . . . . . . . . . . . . .   6
       3.2.2.  Vertical Shortcuts  . . . . . . . . . . . . . . . . .   6
       3.2.3.  Generalizing to any Directed Acyclic Graph  . . . . .   7
     3.3.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . .   8
       3.3.1.  DC Fabrics  . . . . . . . . . . . . . . . . . . . . .   8
       3.3.2.  Metro Fabrics . . . . . . . . . . . . . . . . . . . .   8
       3.3.3.  Building Cabling  . . . . . . . . . . . . . . . . . .   8
       3.3.4.  Internal Router Switching Fabrics . . . . . . . . . .   9
       3.3.5.  CloudCO . . . . . . . . . . . . . . . . . . . . . . .   9
   4.  Deployment Considerations . . . . . . . . . . . . . . . . . .  11
     4.1.  South Reflection  . . . . . . . . . . . . . . . . . . . .  12
     4.2.  Suboptimal Routing on Link Failures . . . . . . . . . . .  12
     4.3.  Black-Holing on Link Failures . . . . . . . . . . . . . .  14
     4.4.  Zero Touch Provisioning (ZTP) . . . . . . . . . . . . . .  15
     4.5.  Miscabling Examples . . . . . . . . . . . . . . . . . . .  15
     4.6.  Positive vs. Negative Disaggregation  . . . . . . . . . .  18
     4.7.  Mobile Edge and Anycast . . . . . . . . . . . . . . . . .  19
     4.8.  IPv4 over IPv6  . . . . . . . . . . . . . . . . . . . . .  21
     4.9.  In-Band Reachability of Nodes . . . . . . . . . . . . . .  22
     4.10. Dual Homing Servers . . . . . . . . . . . . . . . . . . .  23
     4.11. Fabric With A Controller  . . . . . . . . . . . . . . . .  24
       4.11.1.  Controller Attached to ToFs  . . . . . . . . . . . .  24
       4.11.2.  Controller Attached to Leaf  . . . . . . . . . . . .  24
     4.12. Internet Connectivity With Underlay . . . . . . . . . . .  25
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