A recovery method for SDN network system and its controller failure

Abstract

The embodiment of the present invention provides an SDN network system and a controller failure recovery method thereof. The system includes multiple controllers, switches, and data sharing centers, and each controller controls multiple switches in a corresponding domain; the first controller After recovering from the fault, obtain the network status information of the domain from the data sharing center; then send a migration start message to the second controller, and the second controller sends a migration end message to the first controller after the migration; the first controller The switch sends a message to all switches in the domain to become the master controller of the domain again, so that all switches can use it as the master controller again; and then sends a message to the data sharing center to become the master controller of the domain, so that the data sharing center Determine it as the main controller of the domain to realize the failure recovery of the main controller in the SDN network system. The embodiment of the present invention can meet the consistency requirement of multi-domain controllers and improve the utilization rate of the controllers.

Description

technical field [0001] The invention relates to the technical field of network virtualization, in particular to an SDN network system and a fault recovery method for a controller thereof. Background technique [0002] Software Defined Network (SDN, Software Defined Network) is an important new network technology. This technology centralizes complex network functions on a centralized controller, which has a macro view of the entire SDN network and provides a programmable interface to control the entire network. The controller can calculate the flow entry required for forwarding the data packet or flow for the switch, and the switch only needs to forward the data packet or flow according to the flow entry. In this way, the switch equipment can be simplified, the equipment cost can be saved, and the controllability and manageability of the entire network can also be improved. [0003] Obviously, the controller plays a very important role in the SDN network, but when the netwo...

AI Technical Summary

Problems solved by technology

This method is to back up the controller or maintain the consistency of the controller through the communication between the controllers of each domain, but this method is not suitable for large-scale network topologies. In large-scale network topologies, there will be frequent communicate, resulting in a decrease in the computing power of the controller, which reduces the performance of the network

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