Node, communication method, and program for node

The present invention provides a node, a communication method and a program used on node. The node is capable of preventing the problems caused by switching between traffic communication paths when a link failure occurs. According to an embodiment of the invention, among ports of a node 10 , ports P 1 and P 2 connected to a link between the node 10 and a node 20 are registered in a virtual port VP 1 , and ports P 3 and P 4 connected to a link between the node 10 and the node 30 are registered in a virtual port VP 2 . The virtual ports VP 1 and VP 2 are registered in a virtual port VP 3 allocated to a virtual LAG group. When one link between the node 10 and the node 20 is disconnected, the node 10 transmits frames, which have been transmitted from a physical port connected to the link, from the virtual port including the physical port, among the virtual ports belonging to the virtual port VP 3 allocated to the virtual LAG group.