1. A process for generating a “child/parent” hierarchical tree in a MANET point-to-multipoint proactive routing protocol ad hoc network, characterized by the fact that it comprises, each time that a “child” router (RR, R) of said network wishes to join a hierarchical tree associated with a source router (SR), associating it with a neighboring “parent” router (R) of said network through the transmitting of a join message designating said source router (SR) to said neighboring parent router (R) in point-to-point mode.