Multicast transmission method by decrementing an associated counter

A method is provided for transmitting data between nodes (Ni) of a group of nodes coupled to one of the access buses (L2-LSP) of a multiple access communications network (R1). This method consists of i) whenever an input node (N2) of the group receives data intended for at least one of the other nodes of the group, to determine the number M of nodes (Ni) of this group by which the data must pass to reach its destination, including the destination node (N4), which together define a transmission path from said input node (N2), and then assign to a dedicated field that is associated with the data a value representative of the number M, before transmitting them, via the access bus, to the first node (N3) of the path, and ii) at each node (Ni) of the path, to decrement from