SDN Layers and Architecture Terminology
draft-irtf-sdnrg-layer-terminology-00

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Last updated 2014-09-10
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SDNRG                                                 E. Haleplidis, Ed.
Internet-Draft                                      University of Patras
Intended status: Informational                       K. Pentikousis, Ed.
Expires: March 14, 2015                                             EICT
                                                              S. Denazis
                                                    University of Patras
                                                           J. Hadi Salim
                                                       Mojatatu Networks
                                                                D. Meyer
                                                                 Brocade
                                                          O. Koufopavlou
                                                    University of Patras
                                                      September 10, 2014

                SDN Layers and Architecture Terminology
                 draft-irtf-sdnrg-layer-terminology-00

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 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 addresses these questions and provides a concise reference
   for SDNRG and the wider SDN community based on relevant peer-reviewed
   literature, the RFC series, and relevant documents by other standards
   organizations.

   This document is a product of the IRTF Software-Defined Networking
   Research Group (SDNRG)

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

Haleplidis, et al.       Expires March 14, 2015                 [Page 1]
Internet-Draft   SDN Layers and Architecture Terminology  September 2014

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

   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on March 14, 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
   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  SDN Layers and Architecture . . . . . . . . . . . . . . . . .   6
     3.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   8
     3.2.  Network Devices . . . . . . . . . . . . . . . . . . . . .  12
     3.3.  Control Plane . . . . . . . . . . . . . . . . . . . . . .  13
     3.4.  Management Plane  . . . . . . . . . . . . . . . . . . . .  14
     3.5.  The Control vs. Management Plane Debate . . . . . . . . .  15
       3.5.1.  Timescale . . . . . . . . . . . . . . . . . . . . . .  15
       3.5.2.  Persistence . . . . . . . . . . . . . . . . . . . . .  16
       3.5.3.  Locality  . . . . . . . . . . . . . . . . . . . . . .  16
       3.5.4.  CAP Theorem Insights  . . . . . . . . . . . . . . . .  16
     3.6.  Network Services Abstraction Layer  . . . . . . . . . . .  17
     3.7.  Application Plane . . . . . . . . . . . . . . . . . . . .  18
   4.  SDN Model View  . . . . . . . . . . . . . . . . . . . . . . .  18
     4.1.  ForCES  . . . . . . . . . . . . . . . . . . . . . . . . .  19
     4.2.  NETCONF . . . . . . . . . . . . . . . . . . . . . . . . .  20
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