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CDN Interconnect (CDNI) Problem Space: Drivers and Enablers

CDN Interconnect (CDNI) Problem Space: Drivers and Enablers. Nabil Bitar (Verizon) Francois Le Faucheur (Cisco) Benjamin Niven-Jenkins (Velocix/ALU) IETF80-Prague CDNI-BOF. Outline. Use cases: Intra-CDN provider CDNI Inter-CDN provider CDNI CDNI Key Enablers.

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CDN Interconnect (CDNI) Problem Space: Drivers and Enablers

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  1. CDN Interconnect (CDNI) Problem Space: Drivers and Enablers Nabil Bitar (Verizon) Francois Le Faucheur (Cisco) Benjamin Niven-Jenkins (Velocix/ALU) IETF80-Prague CDNI-BOF

  2. Outline • Use cases: • Intra-CDN provider CDNI • Inter-CDN provider CDNI • CDNI Key Enablers

  3. Use Case 1: Intra-CDN provider CDNI • Driver: Leverage all provider CDN assets and provide for optimum content delivery • An intra-CDN provider CDNI interconnects two autonomous (standalone) CDNs owned and operated by the same CDN provider • Autonomous CDNs in a single provider network may arise as a result of • mergers and acquisitions • co-existence of multi-vendor CDN solutions for business or legacy reasons • autonomous organizations/entities within the same CDN provider, each operating its own CDN

  4. Use Case 2: Inter-CDN Provider CDNI • CDN generic goal: improved user experience and distribution efficiency by caching and delivering content to a user agent as close to the agent as possible • An inter-CDN provider CDNI interconnects two CDNs owned and operated by two different CDN providers • Inter-provider CDNI drivers: • Enable a CDN provider to extend its CDN geographic coverage via CDN interconnects with other downstream CDN providers • Alternative to expanding its own CDN for operational and/or cost reasons • Value proposition to CSPs – one/few CDN providers for geographic coverage • Enable a CDN provider to provide CDN services to upstream CDNs to: • Optimize its backbone bandwidth utilization • Get in the content delivery value chain

  5. CDN Interconnects – Key Missing Enablers • Ability to exchange information necessary for enabling various aspects of the interconnect (e.g., policies, capabilities, type/frequency of accounting information exchange) • Ability of a CDN to request action from its upstream CDN or downstream CDN (e.g., pre-position content from an upstream CDN in a downstream CDN, purge previously downloaded content, etc.) • Ability of interconnected CDNs to exchange information about congestion state/load conditions at different granularity levels subject to CDN confidentiality policies – assist request routing • Ability of a CDN to inform a downstream CDN how and where to acquire content from

  6. CDN Interconnects – Key Missing Enablers • Ability of a CDN to report to an upstream CDN redirection request rejections – part of request routing • Ability of a CDN to communicate content distribution policies to the downstream CDN (e.g., content time-availability window, geo-blocking information, purge rules, authorization/authentication) • Ability of a downstream CDN to report accounting information to an upstream CDN for settlement purposes between the interconnected CDNs or an upstream CDN and a CSP • Ability of a downstream CDN to report events and other logging information

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