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Lossless Path Switching Based on Multi-Controller

In order to solve the Intra-domain consistency problem in SDN domain, this paper proposes a new method to check the running state of new routes before deleting existing routes. The specific identification process is to send two identical forwarding flow tables to each OVS switch on the new path and the old path through multicast. After receiving the same data packet, the switch confirms that the old and new links of the current network can forward the data packet normally, and then disconnects the old link. Then, the new path is formally used. Finally, the remaining bandwidth and throughput of the new path are submitted to the controller, and the controller re plans the route.