Abstract: There are too many technologies and protocols in computer networks.In order to improve the teaching quality and rely on little hardware,we adopt eNSP software to our computer network experiments.Through the analysis of eNSP software functions and the characteristics,it is pointed out that using simulation software eNSP in the computer network engineering teaching may deepen the students awareness and understanding for the basic theory and the basic concepts,and lay a solid foundation for students to build and use computer network in the future.Through an instance,the application of eNSP software in the MPLS VPN configuration is introduced.