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This paper proposes a new architecture that can guarantee end-to-end QoS for premium service without per-flow state management at core routers under the differentiated services framework. We develop a signaling protocol to select the route satisfying the end-to-end QoS requirements and reserve resources for each flow when a session is initiated. A mechanism is proposed to make the packets of each flow keep the same route. Meanwhile packets belonging to the other classes of service are still in normal DiffServ. A bandwidth broker is introduced to allocate the resources in an autonomous domain and between them.