There are some defects in the typical SDN network with centralized control. When the network structure is very complex, there are a lot of switches in the network, and the data processing pressure of the SDN controller is very high. In order to solve this problem, a multi-domains SDN topology are designed. Setting up a separate controller into each domain reduces the amount of data processing of a single controller. The problem of negotiation among each domain controllers is research are

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... In order to reduce the frequent interaction between the control layer and the infrastructure layer, pre-rooting is used to divide the partial controller function of the controller to the SDN switches. The new construction method of SDN data transmission path can effectively reduce the message processing time and improve the data transmission speed.