Understanding hybrid CDN-P2P: why limelight needs its own Red Swoosh

  • Authors:
  • Cheng Huang;Angela Wang;Jin Li;Keith W. Ross

  • Affiliations:
  • Microsoft Research, Redmond, WA;Polytechnic University, Brooklyn, NY;Microsoft Research, Redmond, WA;Polytechnic University, Brooklyn, NY

  • Venue:
  • Proceedings of the 18th International Workshop on Network and Operating Systems Support for Digital Audio and Video
  • Year:
  • 2008

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Abstract

In this paper, we quantify the potential gains of hybrid CDN-P2P for two of the leading CDN companies, Akamai and Limelight. We first develop novel measurement methodology for mapping the topologies of CDN networks. We then consider ISP-friendly P2P distribution schemes which work in conjunction with the CDNs to localize traffic within regions of ISPs. To evaluate these schemes, we use two recent, real-world traces: a video-on-demand trace and a large-scale software update trace. We find that hybrid CDN-P2P can significantly reduce the cost of content distribution, even when peer sharing is localized within ISPs and further localized within regions of ISPs. We conclude that hybrid CDN-P2P distribution can economically satisfy the exponential growth of Internet video content without placing an unacceptable burden on regional ISPs.