NETWORK SYSTEM, NODE AND NODE CONTROL PROGRAM, AND NETWORK CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide a technology whereby a network adopting a node redundancy protocol and a network adopting the other STP protocol (management of a state of ports) coexist.

SOLUTION: A network system disclosed herein is configured such that the STP protocol manages a state of ports belonging to a master node 10 and a backup node 20 configuring the network adopting the STP protocol, under the management of the node redundancy protocol, and under the management of the STP protocol, the master node 10 or the backup node 20 transmits a Hello message (a monitor control frame of the nodes and links) to all or parts of nodes connected to the ports under the management of the node redundancy protocol, and transmits a Flush message (a rewrite control frame of a forwarding database) to all or parts of the nodes connected to the ports under the management of the node redundancy protocol in the case of switching to a master mode.

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