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The proprietary nature of existing Content Delivery Networks (CDNs) meansthey are closed and do not naturally cooperate. A CDN is expected to providehigh performance Internet content delivery through global coverage, which mightbe an obstacle for new CDN providers, as well as affecting commercial viabilityof existing ones. Finding ways for distinct CDNs to coordinate and cooperatewith other CDNs is necessary to achieve better overall service, as perceived byend-users, at lower cost. In this paper, we present an architecture to supportpeering arrangements between CDNs, based on a Virtual Organization (VO) model.Our approach promotes peering among providers, while upholding user perceivedperformance. This is achieved through proper policy management of negotiatedService Level Agreements (SLAs) between peers. We also present a Quality ofService (QoS)-driven performance modeling approach for peering CDNs in order topredict the user perceived performance. We show that peering between CDNsupholds user perceived performance by satisfying the target QoS. Themethodology presented in this paper provides CDNs a way to dynamicallydistribute user requests to other peers according to differentrequest-redirection policies. The model-based approach helps an overloaded CDNto return to a normal state by offloading excess requests to the peers. It alsoassists in making concrete QoS guarantee for a CDN provider. Our approachendeavors to achieve scalability and resource sharing among CDNs througheffective peering in a user transparent manner, thus evolving past the currentlandscape where non-cooperative and distinct CDNs exist.

Architecture and Performance Models for QoS-Driven Effective Peering of Content Delivery Networks