SDN Layers and Architecture Terminology
draft-irtf-sdnrg-layer-terminology-02

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Last updated 2014-10-12 (latest revision 2014-10-01)
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SDNRG                                                 E. Haleplidis, Ed.
Internet-Draft                                      University of Patras
Intended status: Informational                       K. Pentikousis, Ed.
Expires: April 3, 2015                                              EICT
                                                              S. Denazis
                                                    University of Patras
                                                           J. Hadi Salim
                                                       Mojatatu Networks
                                                                D. Meyer
                                                                 Brocade
                                                          O. Koufopavlou
                                                    University of Patras
                                                      September 30, 2014

                SDN Layers and Architecture Terminology
                 draft-irtf-sdnrg-layer-terminology-02

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.  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.

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Haleplidis, et al.        Expires April 3, 2015                 [Page 1]
Internet-Draft   SDN Layers and Architecture Terminology  September 2014

   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 3, 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 . . . . . . . . . . . . . . . . . . . . . . . . .   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
     4.4.  Interface to the Routing System . . . . . . . . . . . . .  20
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