GarrettCom公司的S-Ring型系统的运行来自于专门定义的端口对,它们附加有环型连接的以太网设备。该系统建立于STP的基础上,但专门应用于环型拓扑。一个环两个终端中的每一个必须与运行S-Ring软件的Magnum 6K切换器的两个端口相连接。环型的正常生成树结构环两端的端口会形成一个非法的冗余路径,这样标准的STP使两个端口的一个阻塞进来的数据包,从而产生正常的以太网通信流。环中所有的通信都通过非阻塞的端口运行正常的LAN操作。此 GarrettCom’s S-Ring system runs from a well-defined port pair, with ring-attached Ethernet devices attached. The system is based on STP but specifically for ring topologies. Each of the two rings of a ring must be connected to the two ports of the Magnum 6K switch running the S-Ring software. Ring Ports at both ends of a normal spanning tree fabric ring create an illegitimate redundant path so that a standard STP blocks one incoming packet from both ports to create a normal Ethernet traffic flow. All communications in the ring run normal LAN operations through non-blocking ports. this