A Reference Model for Representing SDN Environments
draft-wehmuth-nmrg-sdn-model-00

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Internet Engineering Task Force                               K. Wehmuth
Internet-Draft                                                A. Ziviani
Intended status: Informational                                      LNCC
Expires: December 23, 2017                                 June 21, 2017

          A Reference Model for Representing SDN Environments
                       draft-wehmuth-nmrg-sdn-model-00

Abstract

   Software-Defined Networks (SDNs) are multilayer systems.  In this
   context, this draft defines a graph-based reference model capable of
   properly representing such complex multilayer networks.  The defined
   reference model thus eases the management and planning of SDN
   environments.

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Wehmuth & Ziviani       Expires December 23, 2017               [Page 1]
Internet-Draft             SDN Reference Model                 June 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Why modeling SDNs as multilayer networks  . . . . . . . . . .   3
   3.  How to model a SDN as a multilayer network  . . . . . . . . .   4
     3.1.  Introduction to MultiAspect Graphs  . . . . . . . . . . .   4
     3.2.  Multilayer graph (MLG) definition . . . . . . . . . . . .   4
     3.3.  Algebraic representations and structures  . . . . . . . .   5
     3.4.  MLG adjacency matrix  . . . . . . . . . . . . . . . . . .   5
     3.5.  SDN reference model . . . . . . . . . . . . . . . . . . .   8
   4.  Conclusion  . . . . . . . . . . . . . . . . . . . . . . . . .   9
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   7.  Informative References  . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   Software-Defined Networks (SDNs) are inherently multilayer systems.
   In addition to the traditional layers associated with the separated
   data and control planes, other layers can be considered to support
   structures, such as hierarchical controllers, structured interaction
   between applications, use of Network Functions Virtualization (NFV)
   on SDN environments, among others.  It is important to properly
   represent such a complex structure in a convenient way that allows
   modeling and analysis of a SDN environment with a single object.

   In this context, we propose the use of a theoretical graph framework
   [Wehmuth2016], capable of modeling multilayer complex networks, for
   representing SDN environments.  This framework is capable of
   representing complex networks containing an arbitrary (finite) number
   of layers, thus allowing the representation of SDN systems with any
   number of associated layers.  In this framework, if desired, the
   usual SDN layers can be divided into sub-layers allowing the creation
   of more detailed and structurally rich SDN reference models.
   Therefore, this framework is capable of modeling various distinct SDN
   architectures, such as ForCES [RFC3746], SDN systems adherent to
   [RFC7426], [draft-irtf-sdnrg-pop-00], or any other layered networking
   architecture.  Further, the considered framework has the property of
   guaranteeing that any model created in it is necessarily equivalent
   (isomorphic) to a directed graph.  Therefore, all knowledge available
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