Happy Eyeballs for Transport Selec3on dra$-grinnemo-taps-he-02 - - PowerPoint PPT Presentation

Happy Eyeballs for Transport Selec3on dra$-grinnemo-taps-he-02

K.-J. Grinnemo, A. Brunstrom, P. Hur5g, N. Khademi, Z. Bozakov TAPS WG, IETF 98 — Chicago

Mo3va3on

• A TAPS system decouples transport services

from the underlying transport protocols

• Happy Eyeballs exploits this decoupling

– Enabling the selec5on of the “most appropriate” transport protocol from among available and feasible transport protocols for a given transport service

Transport Service MPTCP TCP UDP SCTP Applica5on

Background

• Builds on previous work

– D. Wing and A. Yourtchenko, “Happy Eyeballs: Success with Dual-Stack Hosts”, RFC 6555, April 2012. – F. Baker, “Tes5ng Eyeball Happiness”, RFC 6556, April 2012.

• Extends previous work

– Selec5on of complete transports, not single protocols – Dynamic selec5on on the basis of pre-set policies and es5mated network characteris5cs

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The Happy Eyeballs Framework

1) Policy Management creates a list of candidate transport solu5ons 2) Transport Probing ini5ates connec5on abempts for transport solu5ons on the list 3) Transport Probing waits for winning connec5on

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Applica5on Policy Management Transport Probing TAPS API

Design and Implementa3on Considera3ons

• Candidate list genera5on

– All available transport solu5ons – On the basis of pre-set policies – On the basis of both pre-set policies and es5mated network characteris5cs – …

• Caching

– Should cache the outcome of previous connec5on abempts (cf. RFC 6555) – Op5onally cache path proper5es, e.g., RTT, path MTU

• Concurrent connec5on abempts

– Event-based – Threads

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A Sample Implementa3on — NEAT

• Candidate list genera5on

– Policy Manager – Policy Informa5on Base – Characteris5cs Informa5on Base

• Caching

– Outcome of connec5on abempts

• Concurrency

– Event-based – Libuv (hbp://libuv.org)

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Characteris5cs Informa5on Base Policy Informa5on Base Policy Manager Applica5on TAPS API Transport Probing

Content

• Problem statement (mo5va5on)
• The Happy Eyeballs Framework
• Design and implementa5on considera5ons
• A Happy Eyeballs Scenario in NEAT

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Q&A