A resource admission control entity and method in an administrative domain (AD). The AD has a topology view that comprises link capacity and link usage information. The resource admission control entity receives a request intended for a user to obtain a multicast content, derives a list of links to be newly used by the multicast content based on the request and verifies if the multicast content can be admitted on the links to be newly used by the multicast content based on the topology view thereby providing an admittance verification result. If the admittance verification result is positive, the admission control module updates usage values in the topology view for the links to be newly used by the multicast content.