Content Delivery Network Interconnection (CDNI) Request Routing Extensions
RFC 8804

Document Type RFC - Proposed Standard (September 2020; No errata)
Authors Ori Finkelman  , Sanjay Mishra 
Last updated 2020-09-23
Replaces draft-finkelman-cdni-rr-sva-extensions
Stream Internet Engineering Task Force (IETF)
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Stream WG state Submitted to IESG for Publication
Document shepherd Kevin Ma
Shepherd write-up Show (last changed 2019-08-11)
IESG IESG state RFC 8804 (Proposed Standard)
Action Holders
Consensus Boilerplate Yes
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Responsible AD Barry Leiba
Send notices to Kevin Ma <>
IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                      O. Finkelman
Request for Comments: 8804                                         Qwilt
Category: Standards Track                                      S. Mishra
ISSN: 2070-1721                                                  Verizon
                                                          September 2020

    Content Delivery Network Interconnection (CDNI) Request Routing


   Open Caching architecture is a use case of Content Delivery Network
   Interconnection (CDNI) in which the commercial Content Delivery
   Network (CDN) is the upstream CDN (uCDN) and the ISP caching layer
   serves as the downstream CDN (dCDN).  This document defines
   extensions to the CDNI Metadata Interface (MI) and the Footprint &
   Capabilities Advertisement interface (FCI).  These extensions are
   derived from requirements raised by Open Caching but are also
   applicable to CDNI use cases in general.

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at

Copyright Notice

   Copyright (c) 2020 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
   ( 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
     1.1.  Terminology
     1.2.  Requirements Language
   2.  Redirect Target Capability
     2.1.  DNS Redirect Target
     2.2.  HTTP Redirect Target
     2.3.  Properties of Redirect Target Capability Object
     2.4.  DnsTarget Object
       2.4.1.  DnsTarget Example
     2.5.  HttpTarget Object
       2.5.1.  HttpTarget Example
     2.6.  Usage Example
   3.  Fallback Target Server Address
     3.1.  Properties of Fallback Target Generic Metadata Object
     3.2.  Usage Example
     3.3.  uCDN Addressing Considerations
   4.  IANA Considerations
     4.1.  CDNI Payload Types
       4.1.1.  CDNI FCI RedirectTarget Payload Type
       4.1.2.  CDNI MI FallbackTarget Payload Type
   5.  Security Considerations
     5.1.  Confidentiality and Privacy
   6.  References
     6.1.  Normative References
     6.2.  Informative References
   Authors' Addresses

1.  Introduction

   The Streaming Video Alliance [SVA] is a global association that works
   to solve streaming video challenges in an effort to improve end-user
   experience and adoption.  The Open Caching Working Group [OCWG] of
   the Streaming Video Alliance [SVA] is focused on the delegation of
   video delivery requests from commercial CDNs to a caching layer at
   the ISP's network.  Open Caching architecture is a specific use case
   of CDNI where the commercial CDN is the upstream CDN (uCDN) and the
   ISP caching layer is the downstream CDN (dCDN).  The Open Caching
   Request Routing Functional Specification [OC-RR] defines the Request
   Routing process and the interfaces that are required for its
   provisioning.  This document defines the CDNI metadata object
   [RFC8006] and the CDNI Footprint and Capabilities object [RFC8008]
   that are required for Open Caching Request Routing:

   *  Redirect Target Capability (for dCDN advertising redirect target

   *  Fallback Target Metadata (for uCDN configuring fallback target

   This document also registers CDNI Payload Types [RFC7736] for these
   defined objects.

   For consistency with other CDNI documents, this document follows the
   CDNI convention of uCDN (upstream CDN) and dCDN (downstream CDN) to
   represent the commercial CDN and ISP caching layer, respectively.

1.1.  Terminology

   The following terms are used throughout this document:

   FQDN    Fully Qualified Domain Name

   CDN     Content Delivery Network

   Additionally, this document reuses the terminology defined in
   [RFC6707], [RFC7336], [RFC8006], [RFC8007], and [RFC8008].
   Specifically, we use the following CDNI acronyms:

   FCI     Footprint & Capabilities Advertisement interface (see
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