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AQM Recommendation draft-ietf- aqm-recommendation -00

AQM Recommendation draft-ietf- aqm-recommendation -00. Gorry F airhurst and Fred Baker. History. At IETF 86, TSVAREA decided to update the recommendation of RFC 2309 to not recommend the use of RED Argument: operational utility was low because of difficulty in configuration

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AQM Recommendation draft-ietf- aqm-recommendation -00

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  1. AQM Recommendationdraft-ietf-aqm-recommendation-00 GorryFairhurst and Fred Baker

  2. History • At IETF 86, TSVAREA decided to update the recommendation of RFC 2309 to not recommend the use of RED • Argument: operational utility was low because of difficulty in configuration • So what algorithm do we replace RED with? • More to the point, what should be true of algorithms that the IETF would recommend?

  3. Persistent unwarranted delay disrupts competing applications

  4. draft-ietf-aqm-recommendations-00 DRAFT Recommendations

  5. Changes sincedraft-baker-aqm-recommendation-02 • S4.3, elaborated intention of auto-tuning requirement for deployment: • SHOULD NOT require tuning • MAY support further manual tuning • MAY provide logging and alarm signals • S4.6, tells about impact on transport does not specify transport CC requirements • Updated security considerations Further review appreciated (see next slide for recommendations)

  6. Conclusions/Recommendations • Network devices SHOULD implement some AQM mechanism • Deployed AQM algorithms SHOULD support Explicit Congestion Notification (ECN) as well as loss to signal congestion to endpoints. • The algorithms that the IETF recommends SHOULD NOT require operational (especially manual) configuration or tuning. • May have knobs, but in general playing with them should be unnecessary • AQM algorithms SHOULD respond to measured congestion, not application profiles. • AQM algorithms SHOULD NOT interpret specific transport protocol behaviors. • Transport protocol congestion control algorithms SHOULD maximize their use of available capacity (when there is data to send) without incurring undue loss or undue round trip delay. • Research, engineering, and measurement efforts are needed regarding … flows that are unresponsive to congestion notification or are responsive, but are more aggressive than present TCP.

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