This paper gives us several perspectives of research. Indeed, we can think of configuring a set of multicast trees for a given domain. The number of multicast forwarding states needed to be stored is rather small as shown during the simulations. This set of trees can be rather stable and the routers do not need to configure others forwarding states for new multicast groups except in case of failures where a reconfiguration may be done. This allows to think of a distributed protocol where the entities responsible of the aggregation will not need to exchange messages in order to aggregate new groups.