CDNI G. Chen
Internet-Draft China Telecom
Intended status: Informational M. Li
Expires: June 28, 2013 H. Xia
ZTE Corporation
J. Liang
China Telecom
December 25, 2012
Request Routing and Content Acquisition
draft-chen-cdni-rr-content-acquisition-01
Abstract
This document illustrates the details of an alternative method that
can be used to provide request routing and content acquisition
services.
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Internet-Draft Request Routing and Content Acquisition December 2012
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Prerequisite . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. CDN Interconnection Framework . . . . . . . . . . . . . . 3
2.2. UniContentID . . . . . . . . . . . . . . . . . . . . . . . 5
2.3. Use Case Description . . . . . . . . . . . . . . . . . . . 7
2.3.1. Request Routing and Content Delivery . . . . . . . . . 7
2.3.2. Content Acquisition . . . . . . . . . . . . . . . . . 9
3. Security Considerations . . . . . . . . . . . . . . . . . . . 10
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 10
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.1. Normative References . . . . . . . . . . . . . . . . . . . 10
6.2. Informative References . . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 11
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Internet-Draft Request Routing and Content Acquisition December 2012
1. Introduction
The scope of CDNi work is described in [I-D.ietf-cdni-problem-
statement]:
- As illustrated in Figure 1, the acquisition of content between
interconnected CDNs is out of scope of CDNi, which deserves some
additional explanation. The consequence of such a decision is that
the CDNi problem space described in this document only focuses on
defining the CDNi control plane; and the CDNi data plane (i.e., the
acquisition and distribution of the actual content objects) is out of
scope.
It can be implied that the delivery process of the actual content
objects requested by the end user from uCDN to dCDN is outside the
scope of CDNi work. However, in the cache miss case, i.e., the dCDN
receives end user's request redirected by the uCDN and fails in
locating the corresponding content in the cache, the dCDN needs to
determine toward which uCDN it should initiate the content
acquisition procedure. And this should be included in scope of CDNi.
This document illustrates the mechanism of request routing and
datatracker.ietf.org