Content Delivery Networks Interconnection is a promising solution to address the limited service scale of Content Delivery Networks. It scales the Content Delivery Network's service footprint through the cooperation of Content Delivery Networks without changing the existing network architecture significantly. However, without more service costs. Simulation results show that our frameworks can scale Content Delivery Network's service footprints with guaranteed service quality and can gain more

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... rvices without increasing service costs. Moreover, our frameworks are winwin request routing frameworks because they help the upstream Content Delivery Network of Content Delivery Network Interconnection increase the service profit without increasing the service cost, and they help downstream Content Delivery Networks of Content Delivery Network Interconnection gain extra revenue by using their idle resources.