Patent ID: 8537691

Claim:
A path-continuity check method comprising: transmitting a check frame by a node device on an upstream side and receiving the check frame by a node device on a downstream side, the node device on the upstream side and the node device on the downstream side acting as respective end points of a path to check continuity of the path; registering, by the node device on the upstream side, path information of the check frame and a transmission port in a transmission learning table together with a downstream learning number that is a table number of a reception learning table of the node device on the downstream side in which the path information is registered; and setting, by the node device on the upstream side, plural of the downstream learning numbers registered in the transmission learning table in one aggregation check frame as table number ON information items and transmitting, by the node device on the upstream side, the one aggregation check frame to the node device on the downstream side.