A complete system which ensures reliable transmission of streaming flows in Flow-Aware Networks (FAN) is presented and analyzed in the paper. A new congestion control mechanism, called RPAEF (Remove and Prioritize in access Active Elastic Flows), is described in details. It allows for fast acceptance of new streaming flows in the admission control (AC) block of FAN routers. The mechanism of limiting the number of new flows accepted in the AC block is provided as an answer to the scalability problem of all congestion control mechanisms proposed for FAN up to now. The global list of protected flows ensures that all streaming flows redirected from the primary route in case of a network element failure are immediately accepted in the first router on a backup route. The advantages and weaknesses of the proposed solutions are described and analyzed. Moreover, it is shown that the simultaneous implementation of all of them ensures fast, scalable and reliable transmission of streaming flows in FAN.This full text paper was peer reviewed at the direction of IEEE Communications Society subject matter experts for publication in the IEEE "GLOBECOM" 2009 proceedings.
In this paper, it is shown that the admission control routine in Flow-Aware Networks (FAN) may lead to severe fair rate degradation, which negatively impacts the performance of streaming applications. In order to prevent this negative behavior, the limitation mechanism is proposed. The aim of the mechanism is to limit the maximum number of new flows that may be admitted on a link between any two consecutive network's automeasurements. The solution is efficient, viable and dramatically reduces the fair rate degradation.
Internet routing processes currently rely on protocols that were developed more than ten years ago. Today, we have far more computational power and memory at our disposal, and it is possible to take advantage of these resources in order to greatly increase the efficiency of routing protocols. Therefore, we propose a new approach to routing packets in IP-based networks: Flow-Aware Multi-Topology Adaptive Routing, or FAMTAR. FAMTAR combines flow-aware traffic management and an adaptive routing mechanism. A standard routing protocol is used to find the optimal path between two nodes in a network. FAMTAR makes it possible to automatically create additional paths when such demand occurs. Between two endpoints, the transmission may follow n different paths, where n is limited only by the topology of the network. In this letter, we compare FAMTAR to a classic routing protocol and demonstrate FAMTAR's superiority.
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