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This paper analyzes a framework to offer reservation of resources and QoS guarantees according to the Resource Reservation Protocol (RSVP) paradigm in a network cloud that supports a differentiated services architecture. The key elements are: intelligent Edge Devices; a flow admission and resource allocation method involving an Admission Control Server; “simple” core routers based on the differentiated services model. The main functionality of a client/server protocol between the Edge Devices and the Admission Control Server, called Simple Admission Control Protocol, is described. The proposed framework is referred to as Admission Control Server based Resource Allocation. Scalability is analyzed and compared with RSVP approach.