Patent ID: 9628324
Date: 2017-04-18
CPC Classifications: H04L

Claim:
1. A failure recovery method used in an Open Flow network including a plurality of OpenFlow switches and an OpenFlow controller configured to control the plurality of OpenFlow switches, wherein the OpenFlow controller has a memory in which a proxy OpenFlow switch for a first OpenFlow switch among the plurality of OpenFlow switches is registered, the proxy OpenFlow switch being one of the plurality of OpenFlow switches other than the first OpenFlow switch and wherein the failure recovery method comprises: detecting, both in the first OpenFlow switch and the OpenFlow controller, a failure on a link between the first OpenFlow switch and the OpenFlow controller when a failure occurs on the link between the first OpenFlow switch and the OpenFlow controller; transmitting a first request to establish an OpenFlow channel from the first OpenFlow switch to a second OpenFlow switch among the plurality of OpenFlow switches when the first OpenFlow switch detects the failure on the link between the first OpenFlow switch and the OpenFlow controller; establishing a first OpenFlow channel between the first OpenFlow switch and the second OpenFlow switch in response to the first request; transmitting a second request to establish an OpenFlow channel from the second OpenFlow switch to the OpenFlow controller when the second OpenFlow switch receives the first request from the first OpenFlow switch; allowing the second request when the OpenFlow controller detects the failure on the link between the first OpenFlow switch and the OpenFlow controller and the second OpenFlow switch that has transmitted the second request is registered as the proxy OpenFlow switch for the first OpenFlow switch in the memory; and establishing a second OpenFlow channel between the second OpenFlow switch and the OpenFlow controller when the second request is allowed.