Abstract: This invention relates to a node of packet-switched network having input interfaces and at least one output interfaces, and a forwarding layer adapted to detect that a received datagram belongs to a coherent flow and to forward it to the appropriate output interface for emission during a reserved time interval, and further adapted to detect a reservation conflict concerning the emission of said datagram on said output interface and, when a reservation conflict is detected, to send a signaling message containing time information for modifying reception dates of subsequent datagrams of said coherent flow.