US 12,218,823 B2
Communication possibility/impossibility indication device, system, method, and program
Hideaki Kimura, Musashino (JP); and Erina Takeshita, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/430,579
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Feb. 4, 2020, PCT No. PCT/JP2020/004037
§ 371(c)(1), (2) Date Aug. 12, 2021,
PCT Pub. No. WO2020/166425, PCT Pub. Date Aug. 20, 2020.
Claims priority of application No. 2019-025666 (JP), filed on Feb. 15, 2019.
Prior Publication US 2022/0141123 A1, May 5, 2022
Int. Cl. H04L 45/12 (2022.01); H04L 12/66 (2006.01); H04L 43/0882 (2022.01); H04L 45/00 (2022.01); H04L 45/302 (2022.01); H04L 45/42 (2022.01)
CPC H04L 45/123 (2013.01) [H04L 12/66 (2013.01); H04L 43/0882 (2013.01); H04L 45/22 (2013.01); H04L 45/302 (2013.01); H04L 45/42 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A network device that connects, via interfaces, a first network that connects a plurality of network devices in a ring shape and determines a traffic communication route based on blockage of a route and learning of route information and a second network that determines a traffic communication route by network devices notifying each other whether communication of traffic is possible, the network device comprising:
a first network control unit that monitors first interfaces on the first network side of the interfaces;
a second network control unit that monitors second interfaces on the second network side of the interfaces; and
a traffic communication possibility/impossibility determination unit that when in a state in which communication is permitted between the first network and the second network, transitions to a state in which communication is not permitted between the first network and the second network in response to having transitioned to a state in which all the first interfaces cannot communicate with the first network and at least one of the second interfaces can communicate with the second network, and further causes the second network control unit to transmit information indicating that communication of traffic is impossible to the second network,
wherein the traffic communication possibility/impossibility determination unit further (a) issues an ethernet VPN (EVPN) control frame to the second network in response to disconnection of the first network and stops traffic to itself, and (b) issues an ethernet ring protocol (ERP) control frame to the first network in response to disconnection of the second network and causes a traffic communication route to be changed.