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