Main-standby virtual gateway system and method based on SDN

Abstract

The invention discloses a main-standby virtual gateway system and method based on the SDN. The system comprises outer net equipment and a main-standby virtual gateway connected with the outer net equipment, the main-standby virtual gateway comprises a main interchanger and multiple standby interchangers, the main interchanger and the multiple standby interchangers are all connected with an SDN controller, and the main interchanger is connected with multiple hosts. The method comprises the steps that the SDN controller starts the virtual main-standby gateway function; the SDN controller involves the interchanges into the virtual gateway and sets the priorities of the interchanges in the virtual gateway; the main interchanger is selected to be used; the main interchanger forwards a message; whether the main interchanger works normally or not is judged, if yes, message forwarding is continued, and if not, the main interchanger is reselected. By means of the main-standby virtual gateway system and method, reliability is improved, and meanwhile host configuration is simplified. With the help of the virtual gateway, a high-reliability default link can be still provided in case a certain interchanger breaks down, and the problem of network interruption occurring after a single link breaks down is effectively avoided.

Description

technical field [0001] The present invention relates to the technical field of network communication, in particular to an SDN-based active and standby virtual gateway system and method. Background technique [0002] Software Defined Network (Software Defined Network, SDN) is a new network innovation architecture and a way to realize network virtualization. Its core technology, OpenFlow, separates the control plane of network equipment from the data plane, thereby realizing the network flow. Flexible control makes the network as a pipeline more intelligent. [0003] SDN separates control from forwarding, realizes centralized control of the entire network through the controller, realizes generalized forwarding hardware, and centralizes control intelligence, which greatly improves the innovation and flexibility of the network. However, in the existing SDN technology, the reliability of the SDN forwarding gateway has not been considered. Once the SDN gateway fails and there is...

AI Technical Summary

Problems solved by technology

Once the SDN gateway fails and there is no backup gateway to replace it, the network inside the gateway will not be able to communicate with the outside of the gateway. Even if there is a backup gateway, it can only be switched manually, and the response speed is slow, which will lead to smooth and seamless switching and data loss. , affecting basic services, resulting in poor user experience

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