The embodiments herein relate to a method in a policy node configured to handle traffic flows in a communications system. The policy node allocates a label-setting identifying a label, a particular traffic flow that will pass through a SDN, and one or more destinations for the particular traffic flow. The policy node transmits information indicating the label-setting to a SDNC configured to create a path for the traffic flow through the SDN based on the label and said one or more destinations identified by the label-setting. The policy node allocates a filter-setting defining that the particular traffic flow should be associated with the label. The policy node transmits information indicating the filter-setting to a classifying node configured to receive the particular traffic flow and to associate the particular traffic flow with the label.