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Title: Integration of flow and congestion control for improved performance of 802.3 switches
Author: Wechta, J.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 1999
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The widespread adaptation of Ethernet Technology in local area networks (LANs) originated from its simple topology and operational mode. This also proved to be an important factor in the development of the high-speed derivatives: Fast Ethernet and Gigabit Ethernet. These, however, are based on switched architectures that incorporate hop-by-hop flow control into switches. This was an important development as it was aimed at preventing data packet losses due to buffer overflow within the switches. However, because most hosts attached to LANs utilise the TCP/IP protocol suite, it also gave rise to a number of unpredictable characteristics in terms of performance and operational behaviour. These relate to the interaction of the hop-by-hop flow control scheme used within switches with the end-to-end flow control scheme used by TCP in the communicating hosts. The research reported in this thesis has been concerned with an investigation into the interaction between TCP and the 802.3x flow control scheme used in switched LANs. In addition, the suitability of the proposed hop-by-hop flow control scheme for QoS management purposes has been investigated and as a result, a modified version of switch flow control has been proposed and analysed. Leading on from this, the research further evolved into an investigation into an alternative hybrid flow control scheme. This is based on three components: an extended and end-to-end flow control scheme, a modified hop-by-hop flow control method and a highly distributed flow admission control mechanism. The latter is known as first packet queuing (FPQ) and in addition to admission control, it also acts as a distributed congestion avoidance method. Also, since it prevents data packet losses by efficient buffer utilisation and management, it eliminates the need for 802.3x hop-by-hop flow control within LAN switches.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available