Multicast information flows are distributed from a source to user terminals over a network including aggregation routers arranged in hierarchical levels. Once a request for a given information flow is received from a user terminal, a distribution path can be defined through a plurality of aggregation routers. At one or more of the aggregation routers traversed by the information flow an information subflow can be derived to be propagated also towards lower-level aggregation routers that are not traversed by the information flow being distributed. Further requests for the same information flow received through an aggregation router towards which the information subflow was propagated are forwarded towards an aggregation router where the subflow was derived.