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NGN (Next Generation Network) architectures are constantly evolving towards solutions that allow the operator to provide QoS-guaranteed services in heterogeneous, multi-domain and multi-services networks. In this context, one of the most advanced technologies is DiffServ-aware Traffic Engineering. It performs Traffic Engineering (TE) in a differentiated service environment by applying routing constrains with class granularity. This approach relies on the definition of an efficient bandwidth constraint model to allocate the available link resources in a per Class Type (CT) basis according to a certain set of resource utilization constraints.
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