SDN controller and control method thereof

Abstract

The invention discloses a control method of an SDN controller. The method comprises the steps of calculating backup paths of a main path according to an obtained software-defined network (SDN) topology and expenses of each link, distributing marker bits for marking the backup paths to the backup paths, and issuing flow table items to SDN forwarding devices on the backup paths according to the backup paths and the corresponding marker bits so that messages can be matched with the flow table items to be forwarded through the backup paths when the main path breaks down. The invention further discloses the SDN controller. By the adoption of the SDN controller and the control method of the SDN controller, it is ensured that the flow obtained before the SDN controller calculates and processes new flow is not lost when the link for forwarding the flow in a network is broken or the topology changes.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a software-defined network controller and a control method thereof. Background technique [0002] OpenFlow is a communication interface standard between a controller and a forwarding layer defined in an SDN (Software Defined Network, software-defined network) architecture. OpenFlow allows direct access and manipulation of the forwarding plane of network devices, which may be physical or virtual. The idea of ​​OpenFlow is to separate the control plane and the data plane, and use standard protocols to communicate between the two; the data plane uses a flow-based method for forwarding. The OpenFlow network consists of SDN forwarding devices and SDN controllers through OpenFlow channels (OpenFlow Channel). The SDN controller is the control center, which generates flow tables based on user configuration or dynamically running protocols and sends them to the SDN forward...

AI Technical Summary

Problems solved by technology

When the link for forwarding traffic in the network is broken or the topology changes, from the time when the SDN forwarding device perceives the port problem to the time when the new traffic is delivered and the guidance is forwarded, the traffic can only be forwarded according to the original traffic. This will result in a total loss of traffic during this time

Even if the SDN forwarding device thinks that the outbound interface of the flow table is faulty and stops the forwarding of the flow table, the traffic cannot be guaranteed before the new flow table is calculated.

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