SDN Layers and Architecture Terminology
draft-irtf-sdnrg-layer-terminology-01

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Last updated 2014-09-18
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SDNRG                                                 E. Haleplidis, Ed.
Internet-Draft                                      University of Patras
Intended status: Informational                       K. Pentikousis, Ed.
Expires: March 20, 2015                                             EICT
                                                              S. Denazis
                                                    University of Patras
                                                           J. Hadi Salim
                                                       Mojatatu Networks
                                                                D. Meyer
                                                                 Brocade
                                                          O. Koufopavlou
                                                    University of Patras
                                                      September 16, 2014

                SDN Layers and Architecture Terminology
                 draft-irtf-sdnrg-layer-terminology-01

Abstract

   Software-Defined Networking (SDN) refers to a new approach for
   network programmability, that is, the capacity to initialize,
   control, change, and manage network behavior dynamically via open
   interfaces as opposed to relying on closed-box solutions and their
   associated 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, a product of the IRTF Software-
   Defined Networking Research Group (SDNRG), addresses these questions
   and provides a concise reference for the SDN research community based
   on relevant peer-reviewed literature, the RFC series, and relevant
   documents by other standards organizations.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

Haleplidis, et al.       Expires March 20, 2015                 [Page 1]
Internet-Draft   SDN Layers and Architecture Terminology  September 2014

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
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   This Internet-Draft will expire on March 20, 2015.

Copyright Notice

   Copyright (c) 2014 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
   (http://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
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   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.  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.  Control and Management Plane Discussion . . . . . . . . .  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 . . . . . . . . . . . . . . . . . . . . . . . . .  18
     4.3.  OpenFlow  . . . . . . . . . . . . . . . . . . . . . . . .  19
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