CHANNEL MONITOR SYSTEM, CHANNEL MONITOR METHOD AND PROGRAM TO ALLOW COMPUTER TO EXECUTE THE METHOD

摘要

PROBLEM TO BE SOLVED: To efficiently monitor optical lines or the like installed among nodes when a network is constituted of a spanning tree function. SOLUTION: A monitor 10 periodically transmits a BPDU(Bridge Protocol Data Unit) packet to each of switching hubs 20 to 40, the switching hubs stores the number of received bytes of the packets into its database section 23, the monitor 10 receives the number of received bytes from the switching hubs 20 to 40 and monitors the state of the channel on the basis of the value.