| 摘要 |
The purpose is to reduce the load on the switches on a secure channel network, while a controller is maintaining or updating the physical topology of the switches under conditions of high delay on the network between the switches, in an open network or the like. Specifically, the controller, which establishes flow entries defining actions and rules for uniformly controlling flows of packets for each of a plurality of switches, establishes for each of the plurality of switches a cyclic flow entry which is deleted in the event that cyclic packets sent and received among the plurality of switches have ceased to arrive. Then, in the event that a notification is received from the switches, to the effect that the cyclic flow entries have been deleted, a malfunction among the plurality of switches is detected. |
