The Flow-Aware Resilient Ring (FARR)as a new\nproposal for Metropolitan Area Networks is presented and\nanalyzed in this paper. This new solution combines the best\nfeatures of two known network architectures: Flow-Aware\nNetworking and Resilient Packet Ring. Traffic in FARR networks\nis served as flows and implicitly classified into one of\ntwo classes: streaming (with high priority) or elastic (without\npriority but with assured bandwidth). This allows for providing\nQuality of Service guarantees in accordance with network\nneutrality rules. Moreover, high priority traffic is protected in\ncase of a network element failure by the steering mechanism,\nwhich ensures fast traffic redirection in time less than 50 ms.\nThe advantages and weaknesses of the proposed architecture\nare presented along with an analysis of traffic distribution\nin different topologies. The formulae provided in the paper\nallow a decision to be made on whether it is profitable to\nreconfigure a single-ring into a multi-ring topology. Moreover,\nit is shown that simultaneous implementation of FARR\nnetworks with congestion control mechanisms ensures fast,\nscalable and reliable transmission of streaming flows.
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