CDN Types

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CDN Classification

Source: Limelight

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Previous CDN classification

•Server based – Incumbents, Akamai •Traditional P2P

▫“Bittorrent”-s▫Pando Networks

•Grid Based•Hybrid Architecture

▫“Peer Assisted Streaming” ▫Joost

Classify CDN based on delivery technology

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CDN Classification - Conventional

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Modern CDN ClassificationClassify CDN based on

▫Who pays for the service? ▫What is the service goal?

not on the delivery technology

•Content Provider CDN•External Service provider CDN•Internal Service Provider CDN•Application CDN

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CDN Classification - New

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Content Provider CDN•Goal – Assure delivery, Reduce load and

delay from content providers’ sites. •Examples

▫Akamai ▫Limelight

•Located – in main service provider’s POP deployed globally

•Client - Content distributers and owners such as CNN, Hulu and “Youtube”-like sites.

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External Service providers CDN•Goal - Reduce EXTERNAL bandwidth cost

for ISP by caching content within the ISP network.

•Examples▫Oversi▫PeerApp

•Located – in main ISP POPs•Equipment is PC server based or

embedded•Clients - service providers like 012 or 014

(Israeli examples)

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Internal Service Provider CDN•Goal - reduce INTERNAL bandwidth load

inside the service provider network by caching.

•Used mainly in IPTV to distribute premium content (due to cost)

•Examples: Mostly VoD service providers▫Bitband (Motorola)▫Velolcix (Alcatel-Lucent)

•Located – Distributed within service provider’s network

•Equipment is PC server based or embedded•Clients – IPTV service providers

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Peer based CDNs•Bittorrent •Giraffic•RayV