A method for configuring a mixed avionic network formed by a communication system including: - a plurality of switches (22A,...,22N) connected to one another; - a plurality of end systems (24A,...,24N), and each end system (24A,...,24N) sending and/or receiving digital data and being connected to at least one switch (22A,...,22N); the method comprising the following steps: - determining sending rules for the sending end system (24A,..., 24N) imposing the sending of digital data in the form of frames of a first type and a second type, each frame of the first type being according to a first protocol, each frame of the second type being according to a second protocol different from the first protocol, the first protocol being of type ARINC 664 P7 and the second protocol being of the Ethernet type with predetermined routing; each frame of each type including a field making it possible to determine its type and being defined by an identifier, the frames of the first type having a same identifier forming a flow of a first type, the frames of the second type having a same identifier forming a flow of a second type; - determining conveying rules comprising defining a path for each flow of the first type between a sending end system (24A,...,24N) and a receiving end system (24A,...,24N); - determining priority rules comprising defining a priority for each flow of the first type such that the priority of each flow of the second type is lower than the priority of each flow of the first type; - sending said rules to the end systems (24A,...,24N) and the switches (22A,...,22N), the sending rules further require defining, for each flow of the second type, a bandwidth, the sending rules further requiring defining, for each flow of the second type, a bandwidth allocation gap corresponding to a minimum sending interval of two consecutive frames of this flow, the bandwidth allocation gap and the bandwidth being defined for each flow of the second type independently of the bandwidths of the flows of the first type or as a function of the bandwidths of the flows of the first type. - a plurality of switches (22A,...,22N) connected to one another; - a plurality of end systems (24A,...,24N), and each end system (24A,...,24N) sending and/or receiving digital data and being connected to at least one switch (22A,...,22N); - determining sending rules for the sending end system (24A,..., 24N) imposing the sending of digital data in the form of frames of a first type and a second type, each frame of the first type being according to a first protocol, each frame of the second type being according to a second protocol different from the first protocol, the first protocol being of type ARINC 664 P7 and the second protocol being of the Ethernet type with predetermined routing; each frame of each type including a field making it possible to determine its type and being defined by an identifier, the frames of the first type having a same identifier forming a flow of a first type, the frames of the second type having a same identifier forming a flow of a second type; - determining conveying rules comprising defining a path for each flow of the first type between a sending end system (24A,...,24N) and a receiving end system (24A,...,24N); - determining priority rules comprising defining a priority for each flow of the first type such that the priority of each flow of the second type is lower than the priority of each flow of the first type; - sending said rules to the end systems (24A,...,24N) and the switches (22A,...,22N), the sending rules further require defining, for each flow of the second type, a bandwidth, the sending rules further requiring defining, for each flow of the second type, a bandwidth allocation gap corresponding to a minimum sending interval of two consecutive frames of this flow, the bandwidth allocation gap and the bandwidth being defined for each flow of the second type independently of the bandwidths of the flows of the first type or as a function of the bandwidths of the flows of the first type.