Abstract
The Flow-Aware Resilient Ring (FARR) as a new proposal for Metropolitan Area Networks is presented and analyzed in this paper. This new solution combines the best features of two known network architectures: Flow-Aware Networking and Resilient Packet Ring. Traffic in FARR networks is served as flows and implicitly classified into one of two classes: streaming (with high priority) or elastic (without priority but with assured bandwidth). This allows for providing Quality of Service guarantees in accordance with network neutrality rules. Moreover, high priority traffic is protected in case of a network element failure by the steering mechanism, which ensures fast traffic redirection in time less than 50 ms. The advantages and weaknesses of the proposed architecture are presented along with an analysis of traffic distribution in different topologies. The formulae provided in the paper allow a decision to be made on whether it is profitable to reconfigure a single-ring into a multi-ring topology. Moreover, it is shown that simultaneous implementation of FARR networks with congestion control mechanisms ensures fast, scalable and reliable transmission of streaming flows.
Highlights
In Flow-Aware Networks (FAN), traffic is served as flows and implicitly classified into one of two types: elastic or streaming
The results show that streaming flows are accepted after tens of seconds in the first routers on their routes (R3 for flows sent from N3 to N1 and R1 for flows sent from N1 to N4) and after about a hundred seconds in the second routers
Based on the results presented we assume that PR P AE F = 0.03 is the value to be used in the RPAEF mechanism for Flow-Aware Resilient Ring (FARR) networks
Summary
A new solution called Flow-Aware Resilient Ring (FARR) is presented and analyzed It was proposed in [6], where the results of the simulation experiments under congestion or a network element failure were presented. FARR ensures fast and reliable transmission in a dual optical ring architecture It has been shown and proved by simulations that even in congestion or failure, priority traffic is protected. The dual ring implementation used in FARR can be extended into architectures composed of many double counter-rotating rings connected by bridges or multifunctional nodes (inter-nodes) The idea behind such solutions is presented in Sect. 5. Multi-ring FARR networks, as well as providing congestion control and priority traffic protection under failure mechanisms, constitute a good proposal for MAN architecture to be used in the Future Internet.
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