分析了在公共无线局域网 (PWLAN)系统中为实现对用户统一有效管理而要求应用的二层隔离技术 ,同时提出通过在无线接入点 (AP)的媒体接入控制 (MAC)层中定义一个隔离参量dot11Isolation ,并修改MAC层协议中Distribution- Service模块的运行状态图以实现二层隔离的一种方法 .同时 ,介绍了一个基于MPC86 0处理器并以嵌入式Linux操作系统为平台来实现二层隔离功能的WLANAP设备实现方案 .仿真结果表明 ,本文提出的二层隔离实现方法是有效可行的 . In the PWLAN system, the application of Layer 2 isolation technology for unified and effective management of users is analyzed. At the same time, it is proposed that by defining a layer in Media Access Control (MAC) layer of a wireless access point (AP) Isolation parameter dot11Isolation, and modify the MAC layer protocol Distribution-Service module running state diagram in order to achieve a two-tier isolation method.At the same time, introduced a based on the MPC86 0 processor and embedded Linux operating system as a platform to achieve two Layer isolation WLANAP equipment implementation.The simulation results show that the proposed two-tier isolation implementation method is effective and feasible.