Patent ID: 7920464

Claim:
A method of redundancy of a ring network, wherein the ring network has multiple switch nodes and each of the switch nodes comprises multiple ports, the method comprising: determining initial states of the ports in the ring network, and setting one of the ports in the ring network as a blocked port, the other ports as forward ports; when a line of the ring network has broken down, causing the switch nodes at two ends of the broken line to broadcast a line broken signal; setting the initially blocked port to the forward port when the initially blocked port receives the line broken signal; setting the ports at two ends of the broken line to the blocked ports; and after the broken line has been repaired, maintaining one of the ports at two ends of the previously broken line as the blocked port, and setting the other port at the two ends of the previously broken line to the forward port, based on a comparison between recovering rates of the ports at the two ends of the previously broken line.