566 - Motivation Scheduling Policing Integrated Services Differentiated Services Take-Home Points Quality of Service Providing Performance

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Unformatted text preview: Motivation Scheduling Policing Integrated Services Differentiated Services Take-Home Points Quality of Service Providing Performance Guarantees on the Internet Daniel Zappala Brigham Young University Computer Science Department Quality of Service Daniel Zappala 1/30 Motivation Scheduling Policing Integrated Services Differentiated Services Take-Home Points 1 Motivation Packet Marking and Classification Traffic Isolation 2 Scheduling 3 Policing 4 Integrated Services 5 Differentiated Services 6 Take-Home Points Quality of Service Daniel Zappala 2/30 Motivation Scheduling Policing Integrated Services Differentiated Services Take-Home Points Question of the Day How can the Internet better support multimedia applications? Quality of Service Daniel Zappala 3/30 Motivation Scheduling Policing Integrated Services Differentiated Services Take-Home Points Providing Multiple Classes of Service want to provide different levels of service to different types of applications analogous to first-class airline service provided for aggregates of traffic, not individual flows dates back to 1979, when Type of Service (ToS) bits were provided in the IPv4 header Quality of Service Daniel Zappala 4/30 Motivation Scheduling Policing Integrated Services Differentiated Services Take-Home Points Motivating Scenarios we will use the figure below to explore general principles H1 is talking to H3, H2 is talking to H4 classic example used for TCP and QoS Quality of Service Daniel Zappala 5/30 Motivation Scheduling Policing Integrated Services Differentiated Services Take-Home Points The Case for Packet Marking example: 1 Mbps VoIP, competing with FTP application bursts of FTP packets can cause audio loss want to give priority to audio over FTP packet marking : allows a router to distinguish among packets belonging to different classes of traffic Quality of Service Daniel Zappala 6/30 Motivation Scheduling Policing Integrated Services Differentiated Services Take-Home Points The Case for Packet Classification what if the VoIP application purchases low-budget service and the FTP user purchases high-priced, high-speed service? it’s not enough to mark packets based on the application type packet classification : allows a router to distinguish among packets belonging to different classes of traffic, based on some criteria Quality of Service Daniel Zappala 7/30 Motivation Scheduling Policing Integrated Services Differentiated Services Take-Home Points The Case for Traffic Isolation problems what if audio application sends as many high-priority packets as it wants? what if many audio applications share the same class but one is not well behaved?...
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This note was uploaded on 10/18/2011 for the course CS 460 taught by Professor Staff during the Spring '05 term at BYU.

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566 - Motivation Scheduling Policing Integrated Services Differentiated Services Take-Home Points Quality of Service Providing Performance

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