Abstract: The invention relates to a method for managing multicast traffic between routers communicating by means of a protocol integrating PIM protocol; and router and switch involved in said method. The routers send messages according to said protocol to request or to reject a type of multicast traffic. At least one of said routers is an improved router (110, 120, 130, 140) which: when it receives one of said messages, obtains in said message an address of the router that has sent said message; stores in a record, for each network interface (112, 122, 132, 142) through which it receives said messages and for each type of multicast traffic requested, the addresses of the routers interested in receiving said type of multicast traffic; and uses the information contained in said record to decide whether or not to transmit said type of multicast traffic through said network interface (112, 122, 132, 142).