A YANG Data Model for Fabric Topology in Data-Center Networks
RFC 8542

Document Type RFC - Proposed Standard (March 2019; No errata)
Last updated 2019-03-25
Replaces draft-zhuang-i2rs-yang-dc-fabric-network-topology
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Internet Engineering Task Force (IETF)                         Y. Zhuang
Request for Comments: 8542                                        D. Shi
Category: Standards Track                                         Huawei
ISSN: 2070-1721                                                    R. Gu
                                                            China Mobile
                                                      H. Ananthakrishnan
                                                                 Netflix
                                                              March 2019

     A YANG Data Model for Fabric Topology in Data-Center Networks

Abstract

   This document defines a YANG data model for fabric topology in data-
   center networks and represents one possible view of the data-center
   fabric.  This document focuses on the data model only and does not
   endorse any kind of network design that could be based on the
   abovementioned model.

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on
   Internet Standards is available in 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/rfc8542.

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
   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.

Zhuang, et al.               Standards Track                    [Page 1]
RFC 8542            Data Model for DC Fabric Topology         March 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Definitions and Acronyms  . . . . . . . . . . . . . . . . . .   3
     2.1.  Key Words . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Model Overview  . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Topology Model Structure  . . . . . . . . . . . . . . . .   4
     3.2.  Fabric Topology Model . . . . . . . . . . . . . . . . . .   4
       3.2.1.  Fabric Topology . . . . . . . . . . . . . . . . . . .   5
       3.2.2.  Fabric Node Extension . . . . . . . . . . . . . . . .   6
       3.2.3.  Fabric Termination-Point Extension  . . . . . . . . .   7
   4.  Fabric YANG Modules . . . . . . . . . . . . . . . . . . . . .   8
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  21
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  22
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  23
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  23
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  24
   Appendix A.  Non-NMDA-State Modules . . . . . . . . . . . . . . .  25
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  32
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  32

1.  Introduction

   A data-center (DC) network can be composed of single or multiple
   fabrics, which are also known as Points Of Delivery (PODs).  These
   fabrics may be heterogeneous due to implementation of different
   technologies when a DC network is upgraded or new techniques and
   features are rolled out.  For example, within a DC network, Fabric A
   may use Virtual eXtensible Local Area Network (VXLAN) while Fabric B
   may use VLAN.  Likewise, an existing fabric may use VXLAN while a new
   fabric (for example, a fabric introduced for DC upgrade and
   expansion) may implement a technique discussed in the NVO3 Working
   Group, such as Geneve [GENEVE].  The configuration and management of
   such DC networks with heterogeneous fabrics could result in
   considerable complexity.

   For a DC network, a fabric can be considered as an atomic structure
   for management purposes.  From this point of view, the management of
   the DC network can be decomposed into a set of tasks to manage each
   fabric separately, as well as the fabric interconnections.  The
   advantage of this method is to make the overall management tasks
   flexible and easy to extend in the future.
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