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Use Cases for Content Delivery Network Interconnection
RFC 6770

Internet Engineering Task Force (IETF)                  G. Bertrand, Ed.
Request for Comments: 6770                                    E. Stephan
Obsoletes: 3570                                  France Telecom - Orange
Category: Informational                                     T. Burbridge
ISSN: 2070-1721                                               P. Eardley
                                                                      BT
                                                                   K. Ma
                                                     Azuki Systems, Inc.
                                                               G. Watson
                                                Alcatel-Lucent (Velocix)
                                                           November 2012

         Use Cases for Content Delivery Network Interconnection

Abstract

   Content Delivery Networks (CDNs) are commonly used for improving the
   End User experience of a content delivery service while keeping cost
   at a reasonable level.  This document focuses on use cases that
   correspond to identified industry needs and that are expected to be
   realized once open interfaces and protocols supporting the
   interconnection of CDNs are specified and implemented.  This document
   can be used to motivate the definition of the requirements to be
   supported by CDN Interconnection (CDNI) interfaces.  It obsoletes RFC
   3570.

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/rfc6770.

Bertrand, et al.              Informational                     [Page 1]
RFC 6770                     CDNI Use Cases                November 2012

Copyright Notice

   Copyright (c) 2012 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
     1.1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
     1.2.  Abbreviations  . . . . . . . . . . . . . . . . . . . . . .  3
     1.3.  Rationale for CDN Interconnection  . . . . . . . . . . . .  4
   2.  Footprint Extension Use Cases  . . . . . . . . . . . . . . . .  6
     2.1.  Geographic Extension . . . . . . . . . . . . . . . . . . .  6
     2.2.  Inter-Affiliates Interconnection . . . . . . . . . . . . .  6
     2.3.  ISP Handling of Third-Party Content  . . . . . . . . . . .  7
     2.4.  Nomadic Users  . . . . . . . . . . . . . . . . . . . . . .  7
   3.  Offload Use Cases  . . . . . . . . . . . . . . . . . . . . . .  8
     3.1.  Overload Handling and Dimensioning . . . . . . . . . . . .  8
     3.2.  Resiliency . . . . . . . . . . . . . . . . . . . . . . . .  9
       3.2.1.  Failure of Content Delivery Resources  . . . . . . . .  9
       3.2.2.  Content Acquisition Resiliency . . . . . . . . . . . . 10
   4.  Capability Use Cases . . . . . . . . . . . . . . . . . . . . . 11
     4.1.  Device and Network Technology Extension  . . . . . . . . . 11
     4.2.  Technology and Vendor Interoperability . . . . . . . . . . 12
     4.3.  QoE and QoS Improvement  . . . . . . . . . . . . . . . . . 12
   5.  Enforcement of Content Delivery Policy . . . . . . . . . . . . 12
   6.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 12
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 13
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 13
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 13
   Appendix A.  Content Service Providers' Delivery Policies  . . . . 14
     A.1.  Content Delivery Policy Enforcement  . . . . . . . . . . . 14

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