RIFT Applicability
draft-ietf-rift-applicability-00

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RIFT WG                                                      Yuehua. Wei
Internet-Draft                                              Zheng. Zhang
Intended status: Informational                           ZTE Corporation
Expires: August 25, 2020                               Dmitry. Afanasiev
                                                                  Yandex
                                                            Tom. Verhaeg
                                              Interconnect Services B.V.
                                                     Jaroslaw. Kowalczyk
                                                           Orange Polska
                                                       February 22, 2020

                           RIFT Applicability
                    draft-ietf-rift-applicability-00

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
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   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 August 25, 2020.

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
   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 August 25, 2020                [Page 1]
Internet-Draft        RIFT Applicability Statement         February 2020

   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  . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Applicable Topologies . . . . . . . . . . . . . . . . . .   5
       3.2.1.  Horizontal Links  . . . . . . . . . . . . . . . . . .   6
       3.2.2.  Vertical Shortcuts  . . . . . . . . . . . . . . . . .   6
     3.3.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . .   6
       3.3.1.  DC Fabrics  . . . . . . . . . . . . . . . . . . . . .   6
       3.3.2.  Metro Fabrics . . . . . . . . . . . . . . . . . . . .   7
       3.3.3.  Building Cabling  . . . . . . . . . . . . . . . . . .   7
       3.3.4.  Internal Router Switching Fabrics . . . . . . . . . .   7
       3.3.5.  CloudCO . . . . . . . . . . . . . . . . . . . . . . .   7
   4.  Deployment Considerations . . . . . . . . . . . . . . . . . .   9
     4.1.  South Reflection  . . . . . . . . . . . . . . . . . . . .  10
     4.2.  Suboptimal Routing on Link Failures . . . . . . . . . . .  10
     4.3.  Black-Holing on Link Failures . . . . . . . . . . . . . .  12
     4.4.  Zero Touch Provisioning (ZTP) . . . . . . . . . . . . . .  13
     4.5.  Miscabling Examples . . . . . . . . . . . . . . . . . . .  13
     4.6.  IPv4 over IPv6  . . . . . . . . . . . . . . . . . . . . .  16
     4.7.  In-Band Reachability of Nodes . . . . . . . . . . . . . .  17
       4.7.1.  Reachability of Leafs . . . . . . . . . . . . . . . .  17
       4.7.2.  Reachability of Spines  . . . . . . . . . . . . . . .  17
     4.8.  Dual Homing Servers . . . . . . . . . . . . . . . . . . .  17
     4.9.  Fabric With A Controller  . . . . . . . . . . . . . . . .  18
       4.9.1.  Controller Attached to ToFs . . . . . . . . . . . . .  19
       4.9.2.  Controller Attached to Leaf . . . . . . . . . . . . .  19
     4.10. Internet Connectivity Without Underlay  . . . . . . . . .  19
       4.10.1.  Internet Default on the Leafs  . . . . . . . . . . .  19
       4.10.2.  Internet Default on the ToFs . . . . . . . . . . . .  20
     4.11. Subnet Mismatch and Address Families  . . . . . . . . . .  20