Content Delivery Network Interconnection (CDNI) Request Routing Extensions
RFC 8804
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
Extensions
Abstract
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
https://www.rfc-editor.org/info/rfc8804.
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
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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
Acknowledgements
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
address)
* Fallback Target Metadata (for uCDN configuring fallback target
address)
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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