Patent ID: 9525590
Filing Date: 2016-12-20
CPC Classification: H04L

Claim Text:
1. A relay system including a plurality of relay devices constituting a ring network, each of the plurality of relay devices comprising: a first port and a second port which are connected to the ring network; a first monitoring point which monitors continuity between the first port of its own device and the second port of another device connected to the first port by use of a CCM frame based on Ethernet OAM; and a second monitoring point which monitors continuity between the second port of its own device and the first port of another device connected to the second port by use of the CCM frame, at least one of the plurality of relay devices further comprising: a first internal monitoring point and a second internal monitoring point which are provided so as to correspond to the first monitoring point and the second monitoring point, respectively, and monitor continuity inside a device between the first monitoring point and the second monitoring point by transmitting and receiving an internal continuity monitoring frame at regular intervals; and a ring control unit which, when the internal continuity monitoring frame is not received within a predetermined period by the first internal monitoring point or the second internal monitoring point, instructs the first monitoring point and the second monitoring point to transmit a RDI frame based on Ethernet OAM or instructs them to stop transmission of the CCM frame.