RIFT Applicability
draft-ietf-rift-applicability-03
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
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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
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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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