Applying QoS in Software Defined Networks by Using WS-agreement

Software Defined Networking decouples network services from the underlying physical hardware, thus agile and secure networks can be build, moved, replaced, and programmatically provided on demand. However, the full range of Software Defined Networking capabilities is not utilized in today's cloud middle wares, especially dynamic Quality of Service enforcement for cloud networks. In this paper we combine the WS-Agreement standard with the Open Flow standard, which allows to define Quality of Service requirements for a set of virtual machines, to negotiate the service level objectives based on the current network utilization, to create a Service Level Agreements for this dedicated cloud network, and to establish a Quality of Service overlay in an Open Flow network based on the Service Level Agreement. Moreover, we present a real world implementation consisting of the WSAG4J framework as SLA frontend and an Open Flow controller as backend. Furthermore, the software integration of both components is described and the regarding network resource allocation is demonstrated and evaluated.