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Design of Advanced Simulation Model of DiffServ Technology in Opnet Modeler Environment
Machata, Tomáš ; Mlýnek, Petr (referee) ; Hošek, Jiří (advisor)
The aim of this bachelor´s thesis was to get acquainted with the problems of ensuring quality of service in IP networks. The greatest attention was devoted to DiffServ technology and methods for the identification and classification of network traffic at edge routers. Simulation model of DiffServ technology was created in OPNET Modeler environment. This model contains a number of edge and core routers, switches, servers and client stations on which it is generating a network traffic (VoIP, HTTP, FTP and databases). Individual applications were included in different classes at the edge routers of DiffServ domain and the different behavior of the applications was ensured with usage of an Assured Forwarding PHB. It was found by using simulations which method of classification packets is the best for the quality of service. Furthermore the model of DiffServ technology was extended about alternative route. OSPF routing protocol was configured here and has been studied the impact of failure of the main line and using of alternative routes to the quality of service.
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Analysis of technologies for quality of services assurance in packet networks
Kulhány, Andrej ; Kouřil, Jiří (referee) ; Hošek, Jiří (advisor)
This bachelor thesis focus on analysis of technologies for guaranted quality of services in packet network. In main part I devote to detailed study of technologies IntServ and DiffServ. Practical part of my bachelor thesis includes design of network in simulating program Openet Modeler. Designed network is pecialized to guarantee quality of services during voice transmission by technology DiffServ. When designing the network I simulated guarantee of services in network without quality of service and in network with quality of services technology DiffServ. Finaly I compared issues of simulations.
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Comparison of architectures of MIB system databases designed for QoS management in data networks
Jelínek, Tomáš ; Hošek, Jiří (referee) ; Molnár, Karol (advisor)
Bachelor thesis deals with Diffserv mechanism for Quality of Service in data network and goes through several parts of structure MIB database for managing Diffserv mechanism. The first chapter is introduction. I explain SNMP protocol in the second chapter. In the third chapter I deal with Quality of Service (QoS) and in the next chapter I explain Diffserv mechanism and its architecture. In fifth chapter I present possibilities of using Policy Information Base (PIB). I show several parts of MIB database in the sixth chapter. I compare two parts of MIB database and summary whole work in the last chapter.
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QoS in IP network with the help of OMNeT++ simulation tool
Hudec, Lukáš ; Mlýnek, Petr (referee) ; Růčka, Lukáš (advisor)
The content of this thesis is giving information about the network simulator OMNeT++ and its superstructure INET Framework. In this thesis a sample simulation of IP network with the help of simulation package INET Framework is realized on this theme. The thesis also deals with analysis of possibilities, how to assure quality service in IP networks and subsequently implementation quality of service in surrounding of network simulator OMNeT++ and its superstructure INET Framework. The implementation is accomplished by two methods. The first method is implementation of differential service, in other words DiffServ, with the help of change the behavior of output. This change rest in sorting of data packets to different queues by their device priority. The second method shows principles of the technology MPLS and also function code protocol OSPF. The MPLS technology is realized by special routers with implemented moduls reservation protocol.
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Evaluation of service quality parameters in data networks
Gregor, Lukáš ; Zeman, Václav (referee) ; Novotný, Vít (advisor)
The bachelor thesis deals about the issues of IP networks. About technologies for ensuring the quality of services, that is necessary to implement in today’s IP networks, due to the large increase of data flows. The bachelor thesis is oriented especially on technologies IntServ, DiffServ, MPLS and requirements of different types of services to the qualitative parameters of data networks. The aim of practical part is to devise a laboratory exercise for measuring qualitative parameters of different services under various condition in the intermediate network. Emulation of network parameters is carried out using emulation tool WANem with GNU Linux core.
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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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New Methods of Quality of Service Assurance in Data Networks
Hošek, Jiří ; Vozňak,, Miroslav (referee) ; Bešťák,, Robert (referee) ; Molnár, Karol (advisor)
The doctoral thesis is focused on a research in the area of the quality-of-service support technologies in data networks. The current modern communication networks cannot operate correctly without an effective tool allowing differentiated treatment for various network traffic classes. Looking at the current trends in this area it turns out that the technology of Differentiated services is currently the most widely used mechanism for QoS assurance in data networks. The major part of this doctoral thesis concerns the design of a novel QoS system which offers a solution for one of the main problems of DiffServ technology. This disadvantage lies in the missing cooperation between the end station and edge node of the DiffServ domain. To overcome this limitation the system proposed introduces an improvement which enables the user application to actively participate in the resource reservation process by direct configuration of the DSCP value in the IP header of its own packets. This functionality is based on the identification of DiffServ configuration parameters available in the edge router. To retrieve the information required from network component the well-known SNMP protocol has been chosen, which has direct access to the components’s configuration stored in the MIB database. On the basis of this theoretical proposal several simulation scenarios have been created and analysed. The results show that the system designed presents an efficient solution for the mentioned problem of DiffServ. They also give good assumptions for the successful implementation of this system into a real environment.
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Effect of Network Link Failure and Alternative Route Usage on Quality of Service Assurance
Atanasčev, Petr ; Škorpil, Vladislav (referee) ; Hošek, Jiří (advisor)
Information about the differentiated services (DiffServ), the link failure problems and the alternate routes in a DiffServ domain finding are the aims of the master´s thesis to be given. Properties of the differentiated services, the usage of marking techniques in the DiffServ domain are described in the thesis. The concept of the DiffServ domain, its structure and mostly used today routing protocol OSPF are described too. The function model of the DiffServ domain has been created in the simulation environment called Opnet Modeleler on the basis of the obtained knowledge. The link failure and the following link recovery have been simulated in the model and the effects have been analyzed after that.
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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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