Feng Gang National Laboratory of Communication,UESTC Aug 2017 Ver 1.4 Components of TE Process Model Measurement subsystem Modeling and analysis subsystem Optimization subsystem 2616009:Network Traffic Engineering Unit 9:Traffic Engineering Page.11
2616009: Network Traffic Engineering Feng Gang National Laboratory of Communication, UESTC Aug 2017 Ver 1.4 Unit 9: Traffic Engineering Page.11 Components of TE Process Model • Measurement subsystem • Modeling and analysis subsystem • Optimization subsystem
Feng Gang National Laboratory of Communication,UESTC Aug 2017 Ver 1.4 Measurement is crucial Determine the operational state of the network Provide feedback data to the optimization function Determine the quality of network service Evaluate the effectiveness of traffic engineering policies Systematical measurement is most effective Note: Measurement provides raw data Evaluation utilizes the raw data to make inferences regarding the monitored system 2616009:Network Traffic Engineering Unit 9:Traffic Engineering Page.12
2616009: Network Traffic Engineering Feng Gang National Laboratory of Communication, UESTC Aug 2017 Ver 1.4 Unit 9: Traffic Engineering Page.12 Measurement is crucial • Determine the operational state of the network • Provide feedback data to the optimization function • Determine the quality of network service • Evaluate the effectiveness of traffic engineering policies • Systematical measurement is most effective Note: Measurement provides raw data Evaluation utilizes the raw data to make inferences regarding the monitored system
Feng Gang National Laboratory of Communication,UESTC Aug 2017 Ver 1.4 Measurement:guestions to consider What parameters to measure? How to measure the parameters? Where should the measurement take place? When should the measurement be performed? How frequently should the variables be measured? 。 What level of accuracy is desirable? What is the acceptable cost of measurement? 2616009:Network Traffic Engineering Unit 9:Traffic Engineering Page.13
2616009: Network Traffic Engineering Feng Gang National Laboratory of Communication, UESTC Aug 2017 Ver 1.4 Unit 9: Traffic Engineering Page.13 Measurement: questions to consider • What parameters to measure? • How to measure the parameters? • Where should the measurement take place? • When should the measurement be performed? • How frequently should the variables be measured? • What level of accuracy is desirable? • What is the acceptable cost of measurement?
Feng Gang National Laboratory of Communication,UESTC Aug 2017 Ver 1.4 Network Modeling Modeling:constructing an abstract representation of network 。 A network model captures relevant network features,attributes and characteristics Link and nodal attributes and constraints A network model facilitates analysis and simulation ·Structural model Focus on the organization of the network and its components ·Behavioral model Focus on the dynamics of the network and traffic workload Accurate source models are particularly useful Good source models are Consistent with empirical data s Tractable and amenable 2616009:Network Traffic Engineering Unit 9:Traffic Engineering Page.14
2616009: Network Traffic Engineering Feng Gang National Laboratory of Communication, UESTC Aug 2017 Ver 1.4 Unit 9: Traffic Engineering Page.14 Network Modeling • Modeling: constructing an abstract representation of network • A network model captures relevant network features, attributes and characteristics - Link and nodal attributes and constraints • A network model facilitates analysis and simulation • Structural model - Focus on the organization of the network and its components • Behavioral model - Focus on the dynamics of the network and traffic workload - Accurate source models are particularly useful - Good source models are §Consistent with empirical data §Tractable and amenable