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Seminar Trends in Congestion Control and Quality-of-Service: Active queue management on the Internet of the future


Kevin Jeffay



Start time:

2001-02-21 09:00

End time:

2001-02-21 12:00



Contact person:


Two of the largest issues facing the Internet today are the problems of providing quality-of-service to applications that require some form of "guarantee" of bandwidth availability and/or end-to-end delay, and the problem of avoiding congestion between traditional best-effort flows. The Internet research community is promoting active queue management in routers as a means of addressing both of these issues. Active queue management refers to managing the length of an outbound queue in a router by selectively dropping packets to bias the behavior and performance of connections transiting the router during times of congestion.In this seminar we will review the congestion control and quality-of-service problems for the Internet and discuss how active queue management (AQM) has become a key component of proposals for advanced congestion control and better-than-best-effort forwarding services. We'll study several AQM algorithms including RED (Random Early Detection), RED with ECN (Explicit Congestion Notification) and their myriad variants. Included will be a discussion of the impact that new traffic types such as real-time audio and video and the protocols used to carry these data types have on the traditional traffic mix on the Internet. The seminar will culminate in a presentation of the differentiated services architecture ("diffserv") for the Internet and its deployment in the Internet 2 Qbone testbed.