2019-11-20, rev -08: Open Caching architecture is a use case of Content Delivery Networks 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). The extensions specified in this document to the CDNI Metadata Interface (MI) and the Footprint and Capabilities Interface (FCI) are derived from requirements raised by Open Caching but are also applicable to CDNI use cases in general.
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