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Interdomain and end-to-end QoS issues

Interdomain and end-to-end QoS issues. Henning Schulzrinne Columbia University NSF QoS workshop – April 2002. Issues. What's hard to scale (and what's not) diversity is good AAA needs a tow truck business models don't work. What's hard to scale (and not). Signaling does not have be hard:

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Interdomain and end-to-end QoS issues

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  1. Interdomain and end-to-end QoS issues Henning Schulzrinne Columbia University NSF QoS workshop – April 2002

  2. Issues • What's hard to scale (and what's not) • diversity is good • AAA needs a tow truck • business models don't work

  3. What's hard to scale (and not) • Signaling does not have be hard: • one message, on a reliable peering channel or IP router alert option • NSIS effort in the IETF? • YESSIR: RTCP-based signaling • 700 MHz Celeron processor • 10,000 flow setups/second  300,000 softstate flows • If scaling matters, sink-tree based reservation (BGRP)

  4. Diversity is good • Unlike routing, no need for single signaling protocol: • multicast is much harder • dumb end devices • edge "pop-up"  only show up in edge nodes

  5. AAA • Signaling can easily be done in ASIC (no harder than IP), but • need cryptographic verification of request • need interface to Authentication, Authorization, Accounting (AAA) • cross-domain authentication  hard, but 3G networks will do it anyway • easier if both sides ask their own access router • see also: iPass for dial-up, OSP (open settlement protocol)

  6. AAA example reserves for both directions Internet AR1 AR2 source destination signs request Cell phone model: both sides pay

  7. Reservation scaling • Example: every long-distance call in the US uses VoIP with per-flow resource reservation • 2000: 567.4 billion minutes @ 10 minutes each  1,800 calls/second • single mySQL server can sustain 500—2,000 queries+updates/second

  8. Business models don't work • Most of the time, "tin" service is no worse than "platinum" service • can't impress others with platinum AmEx card • no frequent flyer bonuses •  everybody switches only when the network is in bad shape

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