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0前言虚拟局域网(Virtual Local Area Network,VLAN)技术是一种新兴的交换技术[1]。通过将局域网内的设备逻辑地(而不是物理地)划分成一个个网段,从而实现虚拟工作组。这种技术能有效分割局域网,实现各网络区域之间的隔离控制。提高了网络安全性,方便网络维护管理。每一个VLAN组成一个逻辑子网,可以覆盖多个网络设备。处于不同地理位置的网络接入设备可以划分到其中任意一个逻辑子网中。同一VLAN中的成员可以直接通信,不同VLAN之间的用户通信则需要通过路由器或三层
0 Introduction Virtual Local Area Network (Virtual Local Area Network, VLAN) technology is a new exchange technology [1]. Virtual workgroups are implemented by subdividing devices within a LAN logically (but not physically) into subnets. This technology can effectively segment the LAN, to achieve isolation between the control of the network area. Improve network security and facilitate network maintenance and management. Each VLAN form a logical subnet, you can cover multiple network devices. Network access devices in different geographical locations can be divided into any of the logical subnets. Members in the same VLAN can communicate directly, and user communications between different VLANs need to pass through the router or Layer 3