Redundant network implementation method

A method for implementing a redundant network, the redundant network including at least one ring network which comprises at least two nodes, the nodes being connected with ring ports therebetween through a link, wherein the method comprises the following steps in a single ring network:

• A. setting all nodes in the single ring network in an initial state as master stations, setting a ring port of each node in a half-blocked state, and broadcasting, with all nodes, a master station election notification message to the ring ports within a preset time interval;
• B. the master station election notification message comprising a node quality comparison vector;
• C. receiving, with the other nodes in the single ring network, the master station election notification message, and each of the other nodes comparing the node quality comparison vector included in the received master station election notification message with the node quality comparison vector owned in each of the other nodes, so as to elect a standby master station, wherein one of the ring ports of the master station is set in the half-blocked state, the other ring ports of the master station are set in a forwarding state, and wherein the master station periodically broadcasts the master station election notification message to the ring ports within the preset time interval;
• D. stopping the standby master station from sending the master station election notification message;
• setting the ring ports of the standby master station in the forwarding state;
• and receiving the master station election notification message sent from the master station;
• E. when the standby master station detects the change of the node quality, the standby master station compares the node quality comparison vector in the received master station election notification message with the node quality comparison vector of the standby master station, so as to re-elect a master station, wherein one of the ring ports of the new master station is set in the half-blocked state, the other ring ports of the new master station are set in the forwarding state, and the ring ports set in the half-blocked state in the former master station are set in the forwarding state;
• and
• F. when the state of the ring port of the node in the single ring network changes, the node refreshes an address list and broadcasts a topology change notification message to the ring port, and when the other nodes in the single ring network receive the topology change notification message, the other nodes refreshes the address list;
• wherein,
• in the half-blocked state, the MAC address of a data message source is not adopted through the nodes, and the data message is blocked simultaneously, the protocol message is forwarded in the loop, and a master station election notification message is broadcasted sent to the ring ports within a preset time interval.