Feng Gang National Laboratory of Communication,UESTC Aug 2017 Ver 1.4 Unit 8 Traffic Management and Modeling 2616009:Network Traffic Engineering 8:Traffic Management and Modeling Page.1
2616009: Network Traffic Engineering Feng Gang National Laboratory of Communication, UESTC Aug 2017 Ver 1.4 8: Traffic Management and Modeling Page.1 Unit 8 Traffic Management and Modeling
Feng Gang National Laboratory of Communication,UESTC Aug 2017 Ver 1.4 Outline Introduction 。 Economic principles Traffic classes ·Time scales ·Mechanisms Some open problems on traffic management 2616009:Network Traffic Engineering 8:Traffic Management and Modeling Page.2
2616009: Network Traffic Engineering Feng Gang National Laboratory of Communication, UESTC Aug 2017 Ver 1.4 8: Traffic Management and Modeling Page.2 Outline • Introduction • Economic principles • Traffic classes • Time scales • Mechanisms • Some open problems on traffic management
Feng Gang National Laboratory of Communication,UESTC Aug 2017 Ver 1.4 An example Executive participating in a worldwide videoconference Proceedings are videotaped and stored in an archive Edited and placed on a Web site 。 Accessed later by others ·During conference Sends email to an assistant Breaks off to answer a voice call 2616009:Network Traffic Engineering 8:Traffic Management and Modeling Page.3
2616009: Network Traffic Engineering Feng Gang National Laboratory of Communication, UESTC Aug 2017 Ver 1.4 8: Traffic Management and Modeling Page.3 An example • Executive participating in a worldwide videoconference • Proceedings are videotaped and stored in an archive • Edited and placed on a Web site • Accessed later by others • During conference - Sends email to an assistant - Breaks off to answer a voice call
Feng Gang National Laboratory of Communication,UESTC Aug 2017 Ver 1.4 What this requires ·For video sustained bandwidth of at least 64 kbps low loss rate ·For voice sustained bandwidth of at least 8 kbps low loss rate For interactive communication low delay (100 ms one-way) ·For playback low delay jitter For email and archiving reliable bulk transport 2616009:Network Traffic Engineering 8:Traffic Management and Modeling Page.4
2616009: Network Traffic Engineering Feng Gang National Laboratory of Communication, UESTC Aug 2017 Ver 1.4 8: Traffic Management and Modeling Page.4 What this requires • For video - sustained bandwidth of at least 64 kbps - low loss rate • For voice - sustained bandwidth of at least 8 kbps - low loss rate • For interactive communication - low delay (< 100 ms one-way) • For playback - low delay jitter • For email and archiving - reliable bulk transport
Feng Gang National Laboratory of Communication,UESTC Aug 2017 Ver 1.4 What if A million executives were simultaneously accessing the network? What capacity should each trunk have? How should packets be routed?(Can we spread load over alternate paths?) How can different traffic types get different services from the network? How should each endpoint regulate its load? How should we price the network? These types of questions lie at the heart of network design and operation,and form the basis for traffic management. 2616009:Network Traffic Engineering 8:Traffic Management and Modeling Page.5
2616009: Network Traffic Engineering Feng Gang National Laboratory of Communication, UESTC Aug 2017 Ver 1.4 8: Traffic Management and Modeling Page.5 What if • A million executives were simultaneously accessing the network? - What capacity should each trunk have? - How should packets be routed? (Can we spread load over alternate paths?) - How can different traffic types get different services from the network? - How should each endpoint regulate its load? - How should we price the network? • These types of questions lie at the heart of network design and operation, and form the basis for traffic management