Abstract: With the continuous development of software-defined network and network function virtualization technology,hardware middleware such as firewall and intrusion detection is replaced by virtual network functions dynamically deployed on specific servers.In addition,in order to meet the traffic security and performance policy,network traffic requests usually need to go through a specific VNF sequence,known as service function chain,which makes the dynamic deployment of VNF become a hot topic in software defined network.Many deployment strategies have been proposed in the academic circle.However,most of the deployment studies are conducted under the constraint of a single resource,and the load balancing of global network resources cannot be achieved.Therefore,this paper proposes a virtual network function deployment strategy that fully considers the global network resources.Firstly,the whole structure of the network model is given,and an integer linear programming model is introduced for mathematical modeling.Then,an improved model solving algorithm is proposed,which can effectively utilize network resources and achieve load balancing under the constraint of global network resources.Finally,the simulation results show that the proposed deployment algorithm can reduce the load balance and improve the request reception rate.

Key words: Deploy, Load balancing, Network function virtual, Request reception rate, Software define network