tsv p2p efforts – from an isp’s perspective richard woundy decade and cdni co-chair
TRANSCRIPT
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TSV P2P Efforts – From an ISP’s Perspective
Richard WoundyDECADE and CDNI co-chair
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Presentation Overview
• Current application traffic levels• Unique P2P traffic impacts for ISPs• TSV WG Efforts for P2P Efficiency– ALTO, DECADE, LEDBAT, PPSP
• Benefits of localization and P2P caching
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Composition of Network TrafficNorth America Peak (Sandvine 2010)
Traffic Class Upstream DownstreamReal-time Entertainment 16.3% 45.7%Web Surfing 11.0% 24.3%P2P File Sharing 53.3% 13.2%Real-time Communications 5.5% N/ASocial Networking N/A 2.4%Gaming N/A 2.4%
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Evolution in Aggregate TrafficNorth America Peak (Sandvine 2011)
Traffic Class 2009 2011Real-time Entertainment 29.5% 49.2%Web Surfing 38.7% 16.6%P2P File Sharing 15.1% 18.8%All Other 16.7% 15.4%
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P2P Traffic Impacts on the Network
• Use of overlay network topology– Often does not reflect physical net topology– Less-than-efficient use of net resources
• Symmetric, high throughput traffic– Impacts plans for network capacity augmentation– May impact design of network equipment– May impact physical allocation of capacity, such as
wireless/wireline frequencies
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Simplified Cable Access Network
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Impact of the P2P Overlay
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TSV WG Efforts for P2P Efficiency
• ALTO– Better initial peer selection for greater swarm
localization• DECADE– In-network storage for caching of P2P data
• LEDBAT– Congestion control to limit delay impact
• PPSP– Enable localization and caching
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Benefits of Swarm Localization
• Initial peers are more likely to be located in same ISP network
• Network benefits– P2P traffic crosses fewer ISP links– ISP may reduce backbone traffic (and backbone
interconnect costs)• Enduser benefits– Peers may perceive lower latency, higher network
reliability, and higher throughput
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P2P Overlay With Localization
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Benefits of P2P Caching
• Traffic exchange among peers is directed through network caching server
• Network benefits– Peers avoid both duplicate uploads and
downloads of data– ISP may reduce access & backbone traffic
• Enduser benefits– Peers may perceive lower latency, higher swarm
reliability, and higher throughput
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P2P Overlay Using Network Caching
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Economics Behind Network Caching• Continued growth in overall Internet traffic– 45-60% y-o-y growth (Arbor/Cisco/MINTS)– Need 33% y-o-y cost reductions to keep up
• Divergence in infrastructure cost reductions– 15% y-o-y cost reduction in routing and
transport costs– 38% y-o-y improvement in price / performance
for commodity servers– 30% y-o-y improvement in storage density
• This is still a work in progress!
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TSV P2P WG Efforts Represent a Promising Industry Direction
• Pro-active traffic management– Versus reactive traffic management
• Applications leverage network information and resources– Versus unilateral actions by either the network or
enduser applications• Win-win traffic optimizations– Versus zero-sum tradeoffs among stakeholders