CDN Brokering

Content distribution networks (CDNs) increase the capacity of individual Web sites and attempt to deliver content from caches that are located “closer ” to end-users than the origin servers that provide the content. CDN brokering provides CDNs a way to in-teroperate by allowing one CDN to intelligently redirect clients dynamically to other CDNs. This paper describes the goals, ar-chitecture, and performance of a CDN brokerage system. Our system has been deployed on the Internet on a provisional basis, and our architectural ideas have helped advance the evolution of Internet standards for interoperating CDNs.