Patent ID: 9565107
Date: 2017-02-07
CPC Classifications: H04L

Claim:
1. A packet relay system comprising: a first packet relay device coupled to a path information storage storing path information indicating a node to which a received packet is to be transmitted; and a second packet relay device coupled to the path information storage, wherein a first priority level is set to the first packet relay device and a second priority level is set to the second packet relay device, the first priority level is higher than the second priority level, when the first packet relay device is an error state, the second packet relay device relays a packet, when the first packet relay device recovers from the error state, the first packet relay device starts to receive the path information from the path information storage, and the first packet relay device transmits a first notification to the second packet relay device, the first notification notifies the second packet relay device of the first priority level, after the second packet relay device receives the first notification, the second packet relay device changes the second priority level to a third priority level that is higher than the first priority level and transmits a second notification to the first packet relay device, the second notification notifies the first packet relay device of the third priority level, after the second packet relay device receives the first notification, the second packet relay device requests the path information storage to transmit the path information, the second packet relay device receives the path information, after receiving the path information, the second packet relay device changes the third priority level to the second priority level and transmits a third notification to the first packet relay device, the third notification notifies the first packet relay device of the second priority level, and after the first packet relay device receives the third notification, the first packet relay device determines, based on the path information, a node to which a received packet is to be transmitted, and transmits the received packet to the determined node.