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Quality of service assurance in IP networks
Kupčiha, Lukáš ; Skořepa, Michal (referee) ; Hošek, Jiří (advisor)
The aim of this work was introducing the options of configuration mechanisms for quality of service (QoS) in basic network products of Cisco company. The characteristics of the techniques for control and management of bandwidth, delay, jitter and packet loss were examined and explained. The attention was then focused mainly on DiffServ mechanism. Its individual functions, such as classification and marking, traffic rate management and its policing and shaping, congestion management queuing and congestion avoidance, are discussed in detail. Further investigation was aimed at the possibility of QoS implementation on Cisco devices. The basic principles and commands for providing the quality of service were then demonstrated by Cisco MQC. The specific terms, such as traffic class definition, policy definition and policy application, were presented and explained. Consequently, the different scenarios of measurement were proposed and a testing network was designed. Influence of FIFO, PQ, CBWFQ and WRED mechanisms on the network traffic was measured. As a result of the work, the optimal mechanism for providing the quality of service was chosen.
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Influence of Traffic Management Parameters Settings on Efficiency of DiffServ Technology
Ludvíček, Pavel ; Skořepa, Michal (referee) ; Hošek, Jiří (advisor)
Main purpose of this bachelor thesis is to understand concepts of Quality of Services system in IP networks with main focus on DiffServ technology and packet classification on boundary routers. DiffServ domain model will be created using OPNET Modeler simulation software. Various scenarios will be created to determine level of influence of individual parameters in DiffServ mechanism to selected network transfer characteristics. Particular mechanisms of packet management will be set as well as various types of queues used in DiffServ technology. Each setting will be tested using simulation in OPNET Modeler and compared using graphs.
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Simulation of network element in Matlab environment
Kuchár, Peter ; Vymazal, Michal (referee) ; Vychodil, Petr (advisor)
Master’s thesis is dedicated to the issue of network element. In the first part are described technological aspects as the internal structure of network elements and control mechanisms that provide differentiaton of services and support their quality requirements. In the first chapter are listed control mechanisms from most simple like FIFO to the more sophisticated like CBWFQ. Active queue managements are not missing and they are described in the section Riadiaci člen. Significant role in the differentiation of services have processes marking and pakets classification. The second chapter is devoted most promising standard DiffServ. Contains section devoted to architecture, paket marking, code point DSCP and the final part is devoted to the types of per-hop behavior and it is expedited forwarding EF and technique assured forwarding AF. The third chapter gives an overview common models of neural networks, their properties and assess their suitability for deployment in network elements. The routher design itself and its structure in programming environment Matlab/Simulink is the subject of the fourth chapter. Except used bloks from Simulink library is described their setting and function in the wiring. Consequently results are reviewied and conclusions drawn.
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|
Quality of service assurance in IP networks
Kupčiha, Lukáš ; Skořepa, Michal (referee) ; Hošek, Jiří (advisor)
The aim of this work was introducing the options of configuration mechanisms for quality of service (QoS) in basic network products of Cisco company. The characteristics of the techniques for control and management of bandwidth, delay, jitter and packet loss were examined and explained. The attention was then focused mainly on DiffServ mechanism. Its individual functions, such as classification and marking, traffic rate management and its policing and shaping, congestion management queuing and congestion avoidance, are discussed in detail. Further investigation was aimed at the possibility of QoS implementation on Cisco devices. The basic principles and commands for providing the quality of service were then demonstrated by Cisco MQC. The specific terms, such as traffic class definition, policy definition and policy application, were presented and explained. Consequently, the different scenarios of measurement were proposed and a testing network was designed. Influence of FIFO, PQ, CBWFQ and WRED mechanisms on the network traffic was measured. As a result of the work, the optimal mechanism for providing the quality of service was chosen.
|
|
|
Influence of Traffic Management Parameters Settings on Efficiency of DiffServ Technology
Ludvíček, Pavel ; Skořepa, Michal (referee) ; Hošek, Jiří (advisor)
Main purpose of this bachelor thesis is to understand concepts of Quality of Services system in IP networks with main focus on DiffServ technology and packet classification on boundary routers. DiffServ domain model will be created using OPNET Modeler simulation software. Various scenarios will be created to determine level of influence of individual parameters in DiffServ mechanism to selected network transfer characteristics. Particular mechanisms of packet management will be set as well as various types of queues used in DiffServ technology. Each setting will be tested using simulation in OPNET Modeler and compared using graphs.
|
|
|
Simulation of network element in Matlab environment
Kuchár, Peter ; Vymazal, Michal (referee) ; Vychodil, Petr (advisor)
Master’s thesis is dedicated to the issue of network element. In the first part are described technological aspects as the internal structure of network elements and control mechanisms that provide differentiaton of services and support their quality requirements. In the first chapter are listed control mechanisms from most simple like FIFO to the more sophisticated like CBWFQ. Active queue managements are not missing and they are described in the section Riadiaci člen. Significant role in the differentiation of services have processes marking and pakets classification. The second chapter is devoted most promising standard DiffServ. Contains section devoted to architecture, paket marking, code point DSCP and the final part is devoted to the types of per-hop behavior and it is expedited forwarding EF and technique assured forwarding AF. The third chapter gives an overview common models of neural networks, their properties and assess their suitability for deployment in network elements. The routher design itself and its structure in programming environment Matlab/Simulink is the subject of the fourth chapter. Except used bloks from Simulink library is described their setting and function in the wiring. Consequently results are reviewied and conclusions drawn.
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