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Carrier Ethernet integrates distributed layer-2 bridge networks to a backbone network. Since carrier Ethernets use simple layer-2 routing, its performance is lower than that of layer-3 routing methods. The authors introduce an analytic model that evaluates the routing methods in backbone networks. The model solves the multi-input and multi-output maximum flow problem in backbone networks using linear programming. Their method can be used as follows. Firstly, the model suggests appropriate link capacity if network topology and traffic pattern is given. Secondly, the model shows and compares the performance of layer-2 routing methods including perfect routing and their proposed routing called ENDIST(Edge Node DIvided Spanning Tree).
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