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Dynamic Metric in OSPF Networks
Mácha, Tomáš ; Orgoň, Miloš (oponent) ; Bešťák, Robert (oponent) ; Novotný, Vít (vedoucí práce)
The massive growth of the Internet has led to increased requirements for reliable network infrastructure. The effectiveness of network communication depends on the ability of routers to determine the best path to send and forward packets to the desired destination. Open Shortest Path First (OSPF) protocol represents one of the most widely used routing protocols and its improvement to keep pace with the rapidly changing Internet environment would be greatly appreciated. The main deficiency of this protocol, among others mentioned in the thesis, is that its metric calculation algorithm does not take current link load into consideration. This is most likely to be the bottleneck in the path what has the most negative impact on network performance. To overcome the limitations of OSPF protocol and to improve the performance of routing in OSPF networks, a novel method based on dynamic adaptation to changing network conditions and alternative metric strategy is proposed. This method solves the problem of absence of traffic awareness and inconveniently congested links that decrease the network utilization. The method is also put into practice. The performance of new method is analyzed and verified by running the tests of the proposed algorithm on real network devices.
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New Mobility Trends in Data Networks
Skořepa, Michal ; Róka, Rastislav (oponent) ; Bešťák, Robert (oponent) ; Koton, Jaroslav (vedoucí práce)
The doctoral thesis is focused on a design of novel Mobile IPv6 handover strategy suitable for deployment in aeronautical data networks. The current handover strategies provide sufficient performance in the conventional ground networks such as WiFi or UMTS that dispose high bandwidth and low latency. However, as this thesis shows, deploying these handover strategies in aeronautical data link environment does not bring desired benefits - the handover latency is high and the related overhead gets high as well. The novel MIPv6 handover strategy presented in this thesis is based on a simple thought: ''I am an aircraft, I know where I'm flying!'' This means that the movement of the aircraft is not random, it is highly predictable. Thanks to that, inter-network handovers may be anticipated and necessary IP handover related actions can be taken in advance, while the aircraft is connected via a broadband ground link at the origination airport. The thesis also presents a comparison of the existing handover strategies with the proposed new one conducted using an analytical approach. This allows to quantify the benefits of the novel handover strategy and the drawbacks of the current ones.
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Dynamic Metric in OSPF Networks
Mácha, Tomáš ; Orgoň, Miloš (oponent) ; Bešťák, Robert (oponent) ; Novotný, Vít (vedoucí práce)
The massive growth of the Internet has led to increased requirements for reliable network infrastructure. The effectiveness of network communication depends on the ability of routers to determine the best path to send and forward packets to the desired destination. Open Shortest Path First (OSPF) protocol represents one of the most widely used routing protocols and its improvement to keep pace with the rapidly changing Internet environment would be greatly appreciated. The main deficiency of this protocol, among others mentioned in the thesis, is that its metric calculation algorithm does not take current link load into consideration. This is most likely to be the bottleneck in the path what has the most negative impact on network performance. To overcome the limitations of OSPF protocol and to improve the performance of routing in OSPF networks, a novel method based on dynamic adaptation to changing network conditions and alternative metric strategy is proposed. This method solves the problem of absence of traffic awareness and inconveniently congested links that decrease the network utilization. The method is also put into practice. The performance of new method is analyzed and verified by running the tests of the proposed algorithm on real network devices.
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|
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New Mobility Trends in Data Networks
Skořepa, Michal ; Róka, Rastislav (oponent) ; Bešťák, Robert (oponent) ; Koton, Jaroslav (vedoucí práce)
The doctoral thesis is focused on a design of novel Mobile IPv6 handover strategy suitable for deployment in aeronautical data networks. The current handover strategies provide sufficient performance in the conventional ground networks such as WiFi or UMTS that dispose high bandwidth and low latency. However, as this thesis shows, deploying these handover strategies in aeronautical data link environment does not bring desired benefits - the handover latency is high and the related overhead gets high as well. The novel MIPv6 handover strategy presented in this thesis is based on a simple thought: ''I am an aircraft, I know where I'm flying!'' This means that the movement of the aircraft is not random, it is highly predictable. Thanks to that, inter-network handovers may be anticipated and necessary IP handover related actions can be taken in advance, while the aircraft is connected via a broadband ground link at the origination airport. The thesis also presents a comparison of the existing handover strategies with the proposed new one conducted using an analytical approach. This allows to quantify the benefits of the novel handover strategy and the drawbacks of the current ones.
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