Patent ID: 6985960

Claim:
A routing information mapping device, comprising: a transmitting unit transmitting Open Shortest Path First packets with information in the options field of the packets about whether a self-device belongs to a connection-oriented network; a receiving unit extracting information about whether another device from which a packet is received belongs to the connection-oriented network and information about a configuration of a network from the device; a tree generation unit generating a routing tree of a network that clearly indicates a device belonging to the connection-oriented network, based on the information extracted by the receiving unit; a judgment unit judging whether the self-device is an edge device of the connection-oriented network, based on the routing tree of the network; an outside network information acquisition unit obtaining information about an outside network connected to the connection-oriented network from both the routing tree and information about the edge device of the connection-oriented network; and a mapping unit generating a table for relating routing information of the connection-oriented network to routing information of the outside network connected to the self-device if the self-device is the edge device, wherein when the outside network is connectionless network, if the packet is inputted to the self-device from the outside network the table has a blank entry in a field of input connection identifier and if the packet is outputted from the self-device to the outside network the table has a blank entry in a field of output connection identifier.