| 摘要 |
<p>Provided is a network system in which a switch for transferring a packet and a control server for determining route information are separated from each other. In the network system, in the case where the switch receives a control message relating to a flow entry registration or the like which is based on the route information from the control server, redundancy of a control channel by an out-of-band control channel and an in-band control channel is achieved. Specifically, in the network system in which the switch for transferring the packet and the control server for determining the route information are separated from each other, the switch and the control server is connected through the control channel for transmitting and receiving the control message. In order to determine the route information, the switch uses a route dedicated to the control message, is connected with the control server by the out-of-band control channel, uses a shared route with an ordinary data communication, and is connected with another control server by the in-band control channel, thereby achieving the redundancy of the control channel.</p> |
