1. A method performed by a service platform for configuring a service in a packet switching network, said method comprising the steps of: determining, by the service platform, a service access point to be affected by configuration of the service; obtaining policy information associated with the service access point from a router of the packet switching network; assigning the service access point to a policy group depending upon the policy information; updating, by the router of the packet switching network, provisioning information associated with the service access point to configure the service based on the assignment of the service access point to the policy group.