SDN Layers and Architecture Terminology
draft-haleplidis-sdnrg-layer-terminology-06

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SDNRG                                                 E. Haleplidis, Ed.
Internet-Draft                                      University of Patras
Intended status: Informational                       K. Pentikousis, Ed.
Expires: January 23, 2015                                           EICT
                                                              S. Denazis
                                                    University of Patras
                                                           J. Hadi Salim
                                                       Mojatatu Networks
                                                                D. Meyer
                                                                 Brocade
                                                          O. Koufopavlou
                                                    University of Patras
                                                           July 22, 2014

                SDN Layers and Architecture Terminology
              draft-haleplidis-sdnrg-layer-terminology-06

Abstract

   Software-Defined Networking (SDN) can be defined as a new approach
   for network programmability.  Network programmability in this context
   refers to the capacity to initialize, control, change, and manage
   network behavior dynamically via open interfaces as opposed to
   relying on closed-box solutions and proprietary interfaces.  SDN
   emphasizes the role of software in running networks through the
   introduction of an abstraction for the data forwarding plane and, by
   doing so, separates it from the control plane.  This separation
   allows faster innovation cycles at both planes as experience has
   already shown.  However, there is increasing confusion as to what
   exactly SDN is, what is the layer structure in an SDN architecture
   and how do layers interface with each other.  This document aims to
   answer these questions and provide a concise reference document for
   SDNRG, in particular, and the SDN community, in general, based on
   relevant peer-reviewed literature and documents in the RFC series.

Status of This Memo

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Haleplidis, et al.      Expires January 23, 2015                [Page 1]
Internet-Draft   SDN Layers and Architecture Terminology       July 2014

   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on January 23, 2015.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  SDN Layers and Architecture . . . . . . . . . . . . . . . . .   6
     3.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   7
     3.2.  Network Devices . . . . . . . . . . . . . . . . . . . . .  11
     3.3.  Control Plane . . . . . . . . . . . . . . . . . . . . . .  12
     3.4.  Management Plane  . . . . . . . . . . . . . . . . . . . .  13
     3.5.  The Control vs. Management Plane Debate . . . . . . . . .  14
       3.5.1.  Timescale . . . . . . . . . . . . . . . . . . . . . .  14
       3.5.2.  Persistence . . . . . . . . . . . . . . . . . . . . .  15
       3.5.3.  Locality  . . . . . . . . . . . . . . . . . . . . . .  15
       3.5.4.  CAP Theorem Insights  . . . . . . . . . . . . . . . .  15
     3.6.  Network Services Abstraction Layer  . . . . . . . . . . .  16
     3.7.  Application Plane . . . . . . . . . . . . . . . . . . . .  17
   4.  SDN Model View  . . . . . . . . . . . . . . . . . . . . . . .  17
     4.1.  ForCES  . . . . . . . . . . . . . . . . . . . . . . . . .  18
     4.2.  NETCONF . . . . . . . . . . . . . . . . . . . . . . . . .  19
     4.3.  OpenFlow  . . . . . . . . . . . . . . . . . . . . . . . .  20
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