A method intended to aid in the reservation of resources within a packet-switched communication network (CR) comprising a number N of relaying nodes (S1-S4). This method consists i), in determining for some at least of the N nodes (S1-S4) at least one resource reservation plan Pik defined by a plan identifier associated with a stream identifier and at least two ports, and ii) in memorizing for each of the N nodes (S1-S4) the various plans Pik relating to them.