Patent ID: 6990064

Claim:
A packet processing method using a multiple fault tolerant network structure including nodes connected as a ring shape having two input lines and two output lines, wherein a first output line of the two output lines of each node is connected to an input line of an adjacent node, another output line of the two output lines of each node is connected to an input line of a node next to the adjacent node, each node selects a received packet after receiving two packets, and disuses another received packet of the two received packets, the method comprising: receiving the packet through a first input line operating normally after checking the input lines: transmitting the packet to a host associated with the node, when the node is an object node of the received packet; disusing the packet when the object node of the received packet is the adjacent node, after checking the packet to determine whether the adjacent node is the object node of the packet; and transmitting duplicated packets through the two output lines, when the object node of the received packet is not the adjacent node.