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In this paper, in order to increase the scalability and fault-tolerance of routing solutions the hierarchical method of interarea fast rerouting in communication networks was presented. The method is based on the decomposed representation of the flowbased routing model with the introduction of the area interaction conditions to ensure connectivity of the inter-area routes. The model includes conditions for border routers protection, adapted for both single path and multipath routing. During the research it was established that the efficiency of the proposed method in terms of the speed of the coordinating procedure convergence was most influenced by the number of border routers and the implemented routing strategy.