| 摘要 |
<p>The present invention allows for the establishment of a packet transfer path running from the control apparatus of a centralized-control type communication system through a distributed-control type network. A control apparatus comprises: a particular link management unit that ascertains a state of the link between relay apparatuses connected via a network that is not to be controlled; a topology management unit that manages the information of a topology including the link between the relay apparatuses connected via the network that is not to be controlled; a path management unit that calculates, on the basis of the information of the topology, a packet transfer path between machines connected to the relay apparatuses and generates control information to be used for causing the relay apparatuses on the transfer path to perform packet transfers in accordance with the transfer path; and a relay apparatus communication unit that sets the control information to the relay apparatuses. The control apparatus causes, out of the relay apparatuses on the transfer path running through the network that is not to be controlled, one of two relay apparatuses, which are connected to the network that is not to be controlled, to transmit a predetermined particular link recognition packet addressed to the other of the two relay apparatuses.</p> |
