This ATIS Standard/Technical Report provides an initial description of Content Distribution Networks (CDN) and develops interconnection Use Cases and high level requirements to support content distribution by two service providers (referred to here as CDN Providers) over their respective networks. The Use Cases and supporting requirements cover the life cycle of interactions between a Primary CDN Provider and a Supporting CDN Provider whose network serves as the access vehicle for End Users requesting the content. This document also describes the delivery of a 'simple' type of content ? Off Peak Software Download via the Cache Distribution Model. The objective is to derive a set of interaction requirements to gain an initial understanding of necessary routing request capabilities and provide a framework for an eventual multi-provider CDN Federation concept.