CDN Interconnection Metadata

The Content Delivery Networks Interconnection (CDNI) metadata interface enables interconnected Content Delivery Networks (CDNs) to exchange content distribution metadata in order to enable content acquisition and delivery. The CDNI metadata associated with a piece of content provides a downstream CDN with sufficient information for the downstream CDN to service content requests on behalf of an upstream CDN. This document describes both a base set of CDNI metadata and the protocol for exchanging that metadata.