A data forwarding device includes a plurality of server interface units, a plurality of virtual network card units and a network interface unit. A server interface unit of the plurality of server interface units is to obtain a data frame to be sent by a virtual network card driver running on a server corresponding to the server interface unit and obtain a first fusion descriptor, and to send the first fusion descriptor and the data frame to a virtual network card unit that corresponds to the virtual network card driver, wherein the first fusion descriptor comprises a type of the descriptor and a length of the data frame. The virtual network card unit is to process the data frame according to the first fusion descriptor, and to send a processed data frame to the network interface unit. The network interface unit is to forward the processed data frame to an external network.