Software-Defined Networking: A Perspective from within a Service Provider Environment
RFC 7149

Document Type RFC - Informational (March 2014; No errata)
Last updated 2014-03-05
Stream IETF
Formats plain text pdf html
Stream WG state (None)
Consensus Unknown
Document shepherd Adrian Farrel
Shepherd write-up Show (last changed 2013-10-07)
IESG IESG state RFC 7149 (Informational)
Telechat date
Responsible AD Adrian Farrel
Send notices to mohamed.boucadair@orange.com, christian.jacquenet@orange.com, draft-sin-sdnrg-sdn-approach@ietf.org
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                      M. Boucadair
Request for Comments: 7149                                  C. Jacquenet
Category: Informational                                   France Telecom
ISSN: 2070-1721                                               March 2014

            Software-Defined Networking: A Perspective from
                 within a Service Provider Environment

Abstract

   Software-Defined Networking (SDN) has been one of the major buzz
   words of the networking industry for the past couple of years.  And
   yet, no clear definition of what SDN actually covers has been broadly
   admitted so far.  This document aims to clarify the SDN landscape by
   providing a perspective on requirements, issues, and other
   considerations about SDN, as seen from within a service provider
   environment.

   It is not meant to endlessly discuss what SDN truly means but rather
   to suggest a functional taxonomy of the techniques that can be used
   under an SDN umbrella and to elaborate on the various pending issues
   the combined activation of such techniques inevitably raises.  As
   such, a definition of SDN is only mentioned for the sake of
   clarification.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7149.

Boucadair & Jacquenet         Informational                     [Page 1]
RFC 7149                         On SDN                       March 2014

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. Introducing Software-Defined Networking .........................4
      2.1. A Tautology? ...............................................4
      2.2. On Flexibility .............................................4
      2.3. A Tentative Definition .....................................5
      2.4. Functional Metadomains .....................................6
   3. Reality Check ...................................................6
      3.1. Remember the Past ..........................................7
      3.2. Be Pragmatic ...............................................8
      3.3. Measure Experience against Expectations ....................8
      3.4. Design Carefully ...........................................9
      3.5. On OpenFlow ................................................9
      3.6. Non-goals .................................................10
   4. Discussion .....................................................11
      4.1. Implications of Full Automation ...........................11
      4.2. Bootstrapping an SDN ......................................12
      4.3. Operating an SDN ..........................................14
      4.4. The Intelligence Resides in the PDP .......................15
      4.5. Simplicity and Adaptability vs. Complexity ................16
      4.6. Performance and Scalability ...............................16
      4.7. Risk Assessment ...........................................17
   5. Security Considerations ........................................17
   6. Acknowledgements ...............................................18
   7. Informative References .........................................18

Boucadair & Jacquenet         Informational                     [Page 2]
RFC 7149                         On SDN                       March 2014

1.  Introduction

   The Internet has become the federative network that supports a wide
   range of service offerings.  The delivery of network services such as
Show full document text