Today’s telecommunication service providers aim at reducing drastically the time for implementing a service in order to reduce the cost. Simultaneously, they want to provide a better quality of service. In this context, an identified solution at the Telecommunication Management Forum (TMF) was to propose a completely automated top-down management of the network using the definition of customer needs as input. In this paper, such a management is illustrated in the particular case of the implementation of a provider provisioned VPN service: starting from the expression of the customer needs and ending at the network configuration. More precisely, this implementation is defined in several steps, which are: § the formalization of the customer needs within one or several service level specification(s) (SLS), § the translation of these formal needs using specific policy information models and § the implementation of these models in order to address the network layer.