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CDNI Requirements draft -lefaucheur-cdni-requirements-01

CDNI Requirements draft -lefaucheur-cdni-requirements-01. Francois Le Faucheur , Cisco Mahesh Viveganandhan , Cisco Grant Watson, BT Yiu Lee, Comcast IETF 80, Prague. Mohamed Boucadair ( mohamed.boucadair@orange-ftgroup.com )

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CDNI Requirements draft -lefaucheur-cdni-requirements-01

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  1. CDNI Requirementsdraft-lefaucheur-cdni-requirements-01 Francois Le Faucheur, Cisco Mahesh Viveganandhan, Cisco Grant Watson, BT Yiu Lee, Comcast IETF 80, Prague Mohamed Boucadair (mohamed.boucadair@orange-ftgroup.com) Christian Jacquenet (christian.jacquenet@orange-ftgroup.com) Dean Cheng (chengd@huawei.com) Yiu Lee (yiu_lee@cable.comcast.com) IETF77, Anaheim

  2. Requirements Structure • Sets of Requirements • Generic Requirements • Control Protocol Requirements • Request Routing Protocol Requirements • Metadata Distribution Protocol Requirements • Logging Protocol Requirements • Security Requirements • Scopes (in each set): • Initial scope (within potential WG initial charter) • MUST: strong convergence that it is required “day1” • SHOULD/MAY: needs further arbitration on whether it can be supported “day1” • Future scope (outside potential WG initial charter)

  3. uCDN= upstream CDN dCDN= downstream CDN Generic Requirements • R1: Leverage existing protocols. • R2: No change in the user agent (the client). • R3: CDNI solution must not be intrusive into CDNs: • dCDN and uCDN are not required to know each other’s cache topology, cache status,… • R4 & R5: HTTP is the first supported protocol for Delivery and Acquisition. • R8: [should] support cascaded CDNs. • R9: [should] support any kind of CDNI topology (e.g. Star, Ring, Tree etc.) • R10: CDNI must prevent looping • R11: CDNI must consider known issues with 3rd party references

  4. Control Protocol Requirements • These requirements are defined to: • Enable CDNs to communicate for management/bootstrapping prior to the actual content delivery. • Enable uCDN to trigger actions in dCDN • Some highlights: • R15: Content Purge request by uCDN (invalidate/delete an object). • R16: Content Purge Acknowledgment by dCDN. • R17: Trigger Metadata pre-positioning from the uCDN to dCDN. • R18: [should] Trigger content pre-positioning from the uCDN to dCDN

  5. Request Routing Protocol Requirements • These requirements are defined to allow the uCDN Routing-Request System (RRS) to delegate a request to the dCDN RRS. • Highlights: • R27: dCDN can refuse further request delegations (“busy” tone) • R28: [should] dCDN advertises capabilities (e.g. footprint, content types), resources (e.g. streaming bandwidth) and affinities (e.g. delivery cost) • R30: [may] dCDN advertises policy/admin-info (e.g. max requests per second, max aggregate volume) • R31 & R32: efficient for small objects (aka DNS-based) and for large objects (aka HTTP-based) • R33 & R34: Support both Recursive Request Routing and Iterative Request Routing. • R37: Pass the user agent location information. • R38: Pass the content metadata location information.

  6. Metadata Distribution Protocol Requirements • These requirements are defined to allow the uCDN to communicate to dCDN the “distribution metadata” • Highlights: • R45: uCDN provides metadata to dCDN • R46: Support both pre-positioning and dynamic content acquisition • R47: Support metadata “Pull” • R48: Support metadata “Push” • R49 & R50: metadata must convey where/how dCDN can acquire content • R51 & R52: Support real-time Add/Modify/Delete metadata • R53& R54: Metadata data structure must support referencing a single object or a set of objects. • R58 & R59 : Support distribution control policies (geo-blocking, time window & authorization checks (e.g. URI signing) Distribution metadata = metadata that is relevant to, and has to be processed, by CDNs (eg where to acquire content, time window)

  7. Logging Protocol Requirements • In a distributed system such as CDNI, logging is used to track/recreate the chain of events (for accounting, monitoring, analytics, troubleshooting). • Highlights: • R63: Reliable logging. • R64: dCDN provides logging to uCDN for content delivery performed by dCDN on behalf of uCDN • R67: Support offload batch upload of log files.

  8. Security Requirements • A set of requirements to secure CDNI • R74: Support secure channel to exchange data over Internet. • R75: Protect against DOS attack. • R76: [should] non-repudiation of logs. • R77: [should] Protect against spoofed log. • R78: [may] Define a mechanism to delegate credentials to downstream CDN to acquire content from the origin.

  9. Questions?

  10. Two New Terms • Recursive CDNI Request Routing • Consult the downstream CDN to make the routing decision • Iterative CDNI Request Routing • Make the routing decision without consulting downstream CDN

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