To prevent the omission of packet caused by the change of virtual transfer route by reducing the processing load of the switch part by decreasing the number of times to change the virtual transfer route.
Even when it is judged that a virtual use transfer route change request is to be outputted by a packet processing part inside a present node, an exchange node 2 does not immediately sends out a new virtual transfer route change request to a switch part 24 but waits for the arrival of the virtual use transfer route change request from a node 18B at the transfer destination of data packet for a fixed time. When the change request arrives, the setting request of the new virtual transfer route for connecting a node 1A at the transfer source of data packet and the node 1B without through a protocol processing part 213 is sent out to the switch part 24.
MIKI KAZUHO
TAKASE MASAHIKO
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