Currently local area network is one of the most prevalent networks.There are multiple virtual local networks and many switches in real local area network,thus it is necessary to implement uniform virtual local area network management and redundant link setting.Trunking protocol is applied to realize the consistency of virtual local area network configuration in view of uniform management.Setting redundant links will bring about loops and broadcast storm,so spanning tree protocol is applied to avoid loops for smooth communication.Simulation can be used for configurating network protocol and realizing communication under lack of experiment funds.DynamipsGUI was applied to simulateminiature local area network,which simplified the network analysis and design.The simulation process was detailed through the configuration of virtual local area network trunking protocol and spanning tree protocol.In virtual environment,application of multiple network protocols is helpful to network configuration learning,and accords with the real network environment as well.