Method of configuring a single-segment pseudo linkup, called a virtual circuit, established between a first and a second terminal device through which a data stream is intended to be transmitted, the virtual circuit being carried by a subjacent path comprising a first link established between the first terminal device and an intermediate device, and a second link established between the intermediate device and the second terminal device, and a third link established between the intermediate device and a third terminal device, the virtual circuit being established by an establishment message comprising an identification parameter for the virtual circuit as well as for the subjacent path carrying the virtual circuit and a label determined by the first device and added by said first terminal device to each packet intended to be sent to said second terminal device, the method being characterized in that it comprises the following steps implemented in the third terminal device: - a step of receiving a configuration message, said message comprising at least the following parameters: - an identification parameter for the virtual circuit, - an identification parameter for the subjacent path carrying the virtual circuit, - a label determined by said first terminal device, - a step of configuring a switching table by means of said parameters, - a step of processing the data stream of the packets intended to be sent to said second terminal device with the aid of the configured table, when the virtual circuit is toggled by said intermediate device from the second to the third link following the detection by said intermediate device of a failure on the second link. - a step of receiving a configuration message, said message comprising at least the following parameters: - an identification parameter for the virtual circuit, - an identification parameter for the subjacent path carrying the virtual circuit, - a label determined by said first terminal device, - a step of configuring a switching table by means of said parameters, - a step of processing the data stream of the packets intended to be sent to said second terminal device with the aid of the configured table, when the virtual circuit is toggled by said intermediate device from the second to the third link following the detection by said intermediate device of a failure on the second link. - a step of receiving a configuration message, said message comprising at least the following parameters: - an identification parameter for the virtual circuit, - an identification parameter for the subjacent path carrying the virtual circuit, - a label determined by said first terminal device, - a step of configuring a switching table by means of said parameters, - a step of processing the data stream of the packets intended to be sent to said second terminal device with the aid of the configured table, when the virtual circuit is toggled by said intermediate device from the second to the third link following the detection by said intermediate device of a failure on the second link. - an identification parameter for the virtual circuit, - an identification parameter for the subjacent path carrying the virtual circuit, - a label determined by said first terminal device, - a step of configuring a switching table by means of said parameters, - a step of processing the data stream of the packets intended to be sent to said second terminal device with the aid of the configured table, when the virtual circuit is toggled by said intermediate device from the second to the third link following the detection by said intermediate device of a failure on the second link.