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 2012Copyright Notice
Copyright (c) 2012 IETF Trust and the persons identified as the
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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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