Nov15 - CSE/ECE404 Computer Networks Instructor Dr Liang...

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Unformatted text preview: CSE/ECE404: Computer Networks Instructor: Dr. Liang Cheng Department of Computer Science and Engineering P.C. Rossin College of Engineering & Applied Science Lehigh University November 15, 2007 Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 11/15/07 Outline ¡ Recap ¡ TCP congestion control ¡ Congestion avoidance ¡ Congestion control framework ¡ Summary and homework Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 11/15/07 TCP Tahoe & TCP Reno ¡ BSD Network Release 1.0 in 4.3 BSD Tahoe Unix distribution ¡ Slow start ¡ AIMD ¡ Fast retransmit ¡ BSD Network Release 2.0 in 4.3 BSD Reno Unix distribution ¡ Fast recovery added Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 11/15/07 Outline ¡ Recap ¡ Congestion avoidance ¡ Congestion control framework ¡ Summary and homework Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 11/15/07 Congestion Avoidance ¡ TCP’s strategy ¡ Control congestion once it happens ¡ Repeatedly increase load in an effort to find the point at which congestion occurs, and then back off ¡ Alternative strategy ¡ Predict when congestion is about to happen ¡ Reduce rate before packets start being discarded ¡ Two categories ¡ DECbit and RED ¡ TCP Vegas Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 11/15/07 DECbit ¡ Routers: add binary congestion bit to each packet ¡ Monitors avg. queue length: last busy+idle cycle ¡ Set congestion bit if average queue length > 1 ¡ What should be done by end hosts?...
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Nov15 - CSE/ECE404 Computer Networks Instructor Dr Liang...

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