Network Working Group L. Peterson, Ed.
Internet-Draft Akamai Technologies, Inc.
Obsoletes: 3466 (if approved) B. Davie
Intended status: Informational VMware, Inc.
Expires: August 22, 2013 February 18, 2013
Framework for CDN Interconnection
draft-ietf-cdni-framework-03
Abstract
This document presents a framework for Content Distribution Network
Interconnection (CDNI). The purpose of the framework is to provide
an overall picture of the problem space of CDNI and to describe the
relationships among the various components necessary to interconnect
CDNs. CDN Interconnection requires the specification of several
interfaces and mechanisms to address issues such as request routing,
distribution metadata exchange, and logging information exchange
across CDNs. The intent of this document is to outline what each
interface needs to accomplish, and to describe how these interfaces
and mechanisms fit together, while leaving their detailed
specification to other documents. It obsoletes RFC 3466.
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
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Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on August 22, 2013.
Copyright Notice
Copyright (c) 2013 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
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
1.2. Reference Model . . . . . . . . . . . . . . . . . . . . . 5
1.3. Structure Of This Document . . . . . . . . . . . . . . . . 9
2. Building Blocks . . . . . . . . . . . . . . . . . . . . . . . 9
2.1. Request Redirection . . . . . . . . . . . . . . . . . . . 9
2.1.1. DNS Redirection . . . . . . . . . . . . . . . . . . . 9
2.1.2. HTTP Redirection . . . . . . . . . . . . . . . . . . . 10
3. Overview of CDNI Operation . . . . . . . . . . . . . . . . . . 11
3.1. Preliminaries . . . . . . . . . . . . . . . . . . . . . . 13
3.2. Iterative HTTP Redirect Example . . . . . . . . . . . . . 14
3.3. Recursive HTTP Redirection Example . . . . . . . . . . . . 19
3.4. Iterative DNS-based Redirection Example . . . . . . . . . 23
3.5. Dynamic Footprint Discovery Example . . . . . . . . . . . 27
3.6. Content Removal Example . . . . . . . . . . . . . . . . . 29
3.7. Pre-Positioned Content Acquisition Example . . . . . . . . 29
3.8. Asynchronous CDNI Metadata Example . . . . . . . . . . . . 31
3.9. Synchronous CDNI Metadata Acquisition Example . . . . . . 33
3.10. Content and Metadata Acquisition with Multiple
Upstream CDNs . . . . . . . . . . . . . . . . . . . . . . 35
4. Main Interfaces . . . . . . . . . . . . . . . . . . . . . . . 36
4.1. In-Band versus Out-of-Band Interfaces . . . . . . . . . . 37
4.2. Cross Interface Concerns . . . . . . . . . . . . . . . . . 37
4.3. Request Routing Interface . . . . . . . . . . . . . . . . 38
4.4. Logging Interface . . . . . . . . . . . . . . . . . . . . 39
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