A method, apparatus and system for connecting the layer2 network and the layer3 network are provided. The first virtual interface receives the data message; according to the virtual interface ID, the first virtual interface searches the layer2 and layer3 virtual interface binding map, and acquires the corresponding second virtual interface; the data messages are transmitted from the second virtual interface; wherein, when the first virtual interface is the layer2 virtual interface, the second virtual interface is the layer3 virtual interface, accordingly, the virtual interface ID is the layer2 virtual interface ID; when the first virtual interface is the layer3 virtual interface, the second virtual interface is the layer2 virtual interface, accordingly, the virtual interface ID is the layer3 virtual interface ID.
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