A Content Delivery Network (CDN) is an infrastructure of network
 elements operating at layer 4 through layer 7, arranged for the
 efficient distribution and delivery of digital content. Such content
 includes, but is not limited to, web pages and images delivered via 
HTTP, and streaming of continuous media delivered via HTTP, RTSP, RTMP, 
etc. CDNs typically provide services to multiple Content Service
Providers (CSPs).
 The goal of the CDNI Working Group is to allow the interconnection of
 separately administered CDNs in support of the end-to-end delivery of
 content from CSPs through multiple CDNs and ultimately to end users (via
 their respective User Agents).

This Working Group is charged with maintaining and developing the specifications for CDNI. The current work items are:

Defining CDNI Metadata

The CDNI Specifications define metadata for exchanging information required for CDNs to cooperate as described in RFC 7336, Framework for Content Distribution Network Interconnection. This includes metadata definitions, defined across multiple documents, for the following:
* CDNI Request Routing interface, including the Footprint and Capabilities interface and Redirection interface;
* CDNI Metadata interface;
* CDNI Logging interface; and
* CDNI Control interface.

These interfaces define how CDNs communicate the information required to direct requests and deliver content, including all the information required to obtain, transform, synthesize, distribute, protect, and communicate about that content, as is typical for CDNs.

The working group will only define specifications that require direct communication or interoperation between CDNs. It will not define:
* New session, transport or network protocols;
* New protocols for delivering content from a CDN to an End User/User Agent;
* New protocols for ingestion of content or metadata between a CSP and a CDN;
* New protocols for acquiring content across CDNs;
* Protocols and algorithms for intra-CDN operations;
* Support for Transparent Caching across CDNs;
* New applications consuming CDNI logs; or
* Digital Right Management (DRM) mechanisms.

The working group will collaborate with other groups both inside and outside the IETF as necessary to accomplish these goals. The working group will accept new work only when:
* The work falls within the scope described above;
* The Working Group Chairs judge that there is consensus to take on the item; and
* The Area Director approves the new work and adds the relevant milestones.