Systems and methods for performing traffic engineering in a communications network using a plurality of network slices are disclosed. The network slices are configured to manage a service including transmission of data along one or more flows along nodes of the communications network using a portion of physical link resources of the communications network. The method includes allocating the portion of physical link resources of the communications network associated with a first network slice of the plurality of network slices in accordance with instructions received from a traffic engineering entity associated with the first network slice.