75 %
25 %
Information about vaidya

Published on April 8, 2008

Author: Teresa1


Network Border Patrol Celio Albuquerque, Brett J. Vickers and Tatsuya Suda:  Network Border Patrol Celio Albuquerque, Brett J. Vickers and Tatsuya Suda Jaideep Vaidya CS590F Fall 2000 Need:  Need End to End Congestion Control / Avoidance Mechanisms not enough. Unresponsive flows Rogue TCP stacks Network level mechanisms - Necessary Evil Try to push as much to the border of the network as possible Essential Idea:  Essential Idea Core Stateless Congestion Avoidance Mechanism Exchange of feedback between Edge Routers Per-flow rate monitoring at Egress Routers Per-flow rate control at Ingress Routers Goals:  Goals Eliminate congestion collapse resulting from undelivered packets When combined with fair queueing, achieve approximately max-min fair bandwidth allocations for competing network flows NBP Egress Router:  NBP Egress Router NBP Ingress Router:  NBP Ingress Router Feedback Control Algorithm:  Feedback Control Algorithm Decides how and when feedback packets are exchanged between edge routers. Necessary for discovering source, communicate per-flow bit rates & detect network congestion by estimating RTT BFFs can be generated asynchronously. (RTT cannot be calculated in this case) FeedBack Packets:  FeedBack Packets Rate Control Algorithm:  Rate Control Algorithm Regulates rate at which each flow enters the network. Converge on set of per-flow transmission rates, preventing congestion collapse. Maximize link utilization. Similar to TCP congestion control (Slow start and Congestion avoidance phases) Handles synchronous and asynchronous packets differently Rate Control Algorithm contd.:  Rate Control Algorithm contd. Activated on receipt of feedback packet. Synchronous feedback Update baseRTT Calculate mrc (minimum rate change) Change rate based on phase Aysnchronous feedback Use old mrc and modify rate based on current phase Results from Simulation Experiments:  Results from Simulation Experiments Preventing congestion collapse Results from Simulation Experiments:  Results from Simulation Experiments Max-min fairness Fairness Results:  Fairness Results NBP by itself is not able to provide fairness. With WFQ or CSFQ, NBP provides approximate fairness, and avoids congestion collapse Results with WFQ are better than results with CSFQ. CSFQ’s fairness mechanism engages only when congestion is detected CSFQ is an approximation of WFQ Implementation Issues:  Implementation Issues Scalable Flow Classification Scalable inter-domain deployment Scalable fairness Incremental Deployment Multicast Multi-path routing Integrated or Differentiated service Conclusion:  Conclusion Pros Good paper. Limitations noted. Stop gap solution. Adequate for goals noted. Cons Incremental deployment not easy. Deployment based on whether we expect QoS technology to be available soon. Overload is directly proportional to number of flows. Would not work well with HTTP 1.0 (more number of flows) Questions?:  Questions?

Add a comment

Related presentations

Related pages

Vaidya - Wikipedia

Vaidya (Sanskrit: वैद्य) is a Sanskrit word meaning "physician". It is also used unchanged in modern Indo-Aryan languages such as Hindi. It was ...
Read more

Daya Vaidya – Wikipedia

Daya Vivian Vaidya (* 20. Mai 1973 in Kathmandu, Nepal) ist eine US-amerikanische Schauspielerin
Read more

Vaidya Guide - Apache Hadoop

Hadoop Vaidya (Vaidya in Sanskrit language means "one who knows", or "a physician") is a rule based performance diagnostic tool for MapReduce ...
Read more

Daya Vaidya: Filme, Serien und Biografie

Die Schauspielerin Daya Vaidya wurde im nepalesischen Kathmandu geboren, siedelte mit ihrer Familie aber bereits als Säugling in die USA über. Ihre erste ...
Read more

Treatment House - Vaidya Vijay

Vaidya P. Vijayan (Vijay) ist der Treatment House Gründer. Er wurde 1962 in Kerala, Südindien, geboren und fährt die Vaidya-Familientradition in der nun ...
Read more

Vaidya | definition of vaidya by Medical dictionary

Vivek Vaidya, Vice President, Automotive & Transportation Practice, Asia Pacific at Frost & Sullivan said that the estimated stable growth of the ...
Read more

Arya Vaidya Sala Kottakkal – Arya Ayurveda Agentur

Im Jahr 1902 gründete Dr. P.S. Varrier das erste Gemeinnützige Ayurveda Zentrum in Kottakkal/Indien, um allen Bedürftigen, unabhängig von Religion und ...
Read more

Arun Shridhar Vaidya - Wikipedia

General Arun Shridhar Vaidya Padma Vibhushan, PVSM, MVC and Bar, AVSM; Born: 27 January 1926 Alibag, British India: Died: 10 August 1986 Pune, Maharashtra ...
Read more

Arya Vaidya Sala Kottakkal: Ayurveda-Klinik in Indien

Im Arya Vaidya Sala Kottakkal eine gemeinnützige Ayurveda-Klinik in Indien, Ayurveda-Traditionen genießen und sich verwöhnen lassen. Hier erholen Sie sich!
Read more

Ärzte und Management | Maharishi Ayurveda Privatklinik

Vaidya Prathmesh Vyas ist bekannt für die Tiefe seines Wissens und seine präzise formulierten, aber dennoch leicht verständlichen Vorträge.
Read more