Network device and network system
AssigneeAlaxala Networks Corporation
InventorsKensuke INO, Hiroyuki YOSHINO, Shinji NOZAKI
Life of this patent
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Abstract
In a ring network including an old master node 100, a new master node 110 is used as a replacement for the old master node 110. During replacement operation, when detecting that two ring ports of the new master node 110 are set in link-up state, the new master node 110 gives a transit node 200 an instruction to forward a health check frame H102 sent from a ring port 102 of the old master node 100 by a forwarding route going through the new master node 110. The new master node 110 can monitor the status of the ring network by receiving the health check frame H102. This configuration enables continuous monitoring for a failure occurring in the ring network during replacement of the master node.
Claims11
A network device to be used as a replacement for a monitoring device as an object to be replaced, the monitoring device being provided as part of a ring network and configured to monitor status of the ring network by repeatedly sending a control frame used to monitor the status of the ring network from one of two ring ports and receiving the control frame at the other of the two ring ports, the network device comprising:
- a link-up detector configured to detect that two ring ports of the network device are set in link-up state, when the network device is connected between first and second adjacent network devices, which are located adjacent to the monitoring device in the ring network, to be arranged in parallel with the monitoring device;
- a forwarding instructor configured to, when the link-up state is detected by the link-up detector, give an instruction to forward the control frame by a forwarding route going through the network device, to the first adjacent network device connected with the ring port of the monitoring device that receives the control frame, out of the first and second adjacent network devices;
- and
- a replacement-time monitor configured to monitor the status of the ring network by receiving the control frame sent from the first adjacent network device.
In a ring network including a monitoring device provided as part of the ring network and configured to monitor status of the ring network by repeatedly sending a control frame used to monitor the status of the ring network from one of two ring ports and receiving the control frame at the other of the two ring ports, a network device connected with the ring port of the monitoring device used to receive the control frame, the network device comprising:
- a start notification frame receiver configured to receive a start notification frame sent from a new network device, on condition that the new network device used as a replacement for the monitoring device as an object to be replaced is located between the network device and an adjacent network device connected with the ring port of the monitoring device used to send the control frame in the ring network to be arranged in parallel with the monitoring device and that two ring ports of the new network device are set in link-up state;
- and
- a control frame forwarder configured to, when the start notification frame is received, forward the control frame sent from the monitoring device by a forwarding route going through the new network device.
A network system comprising:
- a first monitoring network device provided as part of a ring network and configured to monitor status of the ring network by repeatedly sending a control frame used to monitor the status of the ring network from one of two ring ports and receiving the control frame at the other of the two ring ports;
- and,
- a second monitoring network device used as a replacement for the first monitoring network device as an object to be replaced, wherein
- the second monitoring network device includes
- a link-up detector configured to detect that two ring ports of the second monitoring network device are set in link-up state, when the second monitoring network device is connected between first and second adjacent network devices to be arranged in parallel with the first monitoring network device, the first and second adjacent network devices being located adjacent to the first monitoring network device in the ring network
- a forwarding instructor configured to, when the link-up state is detected by the link-up detector, give an instruction to forward the control frame by a forwarding route going through the second monitoring network device, to the first adjacent network device connected with the ring port of the first monitoring network device that receives the control frame, out of the first and second adjacent network devices;
- and
- a replacement-time monitor configured to monitor the status of the ring network by receiving the control frame sent from the first adjacent network device.
Dependencies are inferred from the claim text.