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The BGP routing system is inflexible and suboptimal for both stub networks and ISPs. Stub networks are unable to obtain routes that meet their end-to-end requirements, and ISPs have limited flexibility in controlling their revenues and offering new services to a wide customer base. The authors present the S4R supplemental routing system to address these shortcomings. Technical soundness and economic viability are equal first class design requirements for S4R. In S4R, ISPs announce links connecting different parts of the Internet. ISPs can selfishly price their links to attract maximal amount of traffic. Stub networks can selfishly select paths that best meet their requirements at the lowest cost.
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