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Content Distribution Network Interconnection (CDNI) Requirements
RFC 7337

Internet Engineering Task Force (IETF)                     K. Leung, Ed.
Request for Comments: 7337                                         Cisco
Category: Informational                                      Y. Lee, Ed.
ISSN: 2070-1721                                                  Comcast
                                                             August 2014

    Content Distribution Network Interconnection (CDNI) Requirements

Abstract

   Content delivery is frequently provided by specifically architected
   and provisioned Content Delivery Networks (CDNs).  As a result of
   significant growth in content delivered over IP networks, existing
   CDN providers are scaling up their infrastructure.  Many Network
   Service Providers (NSPs) and Enterprise Service Providers (ESPs) are
   also deploying their own CDNs.  To deliver contents from the Content
   Service Provider (CSP) to end users, the contents may traverse across
   multiple CDNs.  This creates a need for interconnecting (previously)
   standalone CDNs so that they can collectively act as a single
   delivery platform from the CSP to the end users.

   The goal of the present document is to outline the requirements for
   the solution and interfaces to be specified by the CDNI working
   group.

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/rfc7337.

Leung & Lee                   Informational                     [Page 1]
RFC 7337                    CDNI Requirements                August 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 ....................................................2
      1.1. Terminology ................................................3
   2. CDNI Model and CDNI Interfaces ..................................4
   3. Generic CDNI Requirements .......................................6
   4. CDNI Control Interface Requirements .............................7
   5. CDNI Request Routing Redirection Interface Requirements ........10
   6. CDNI Footprint & Capabilities Advertisement Interface
      Requirements ...................................................12
   7. CDNI Metadata Interface Requirements ...........................14
   8. CDNI Logging Interface Requirements ............................18
   9. CDNI Security Requirements .....................................20
   10. Security Considerations .......................................21
   11. Contributors ..................................................21
   12. Acknowledgements ..............................................21
   13. References ....................................................22
      13.1. Normative References .....................................22
      13.2. Informative References ...................................22

1.  Introduction

   The volume of video and multimedia content delivered over the
   Internet is rapidly increasing and expected to continue doing so in
   the future.  In the face of this growth, Content Delivery Networks
   (CDNs) provide numerous benefits: reduced delivery cost for cacheable
   content, improved quality of experience for end users, and increased
   robustness of delivery.  For these reasons, CDNs are frequently used
   for large-scale content delivery.  As a result of the significant
   growth in content delivered over IP networks, existing CDN providers
   are scaling up their infrastructure and many NSPs and ESPs are
   deploying their own CDNs.  Subject to the policy of the Content
   Service Provider (CSP), it is generally desirable that a given item

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