STP生成树理论,stp,rstp,mstp,pvst,pvst+比较（STP generation tree theory, STP, RSTP, MSTP, PVST, PVST + comparison）.doc

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2017-07-15 发布于河南
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STP生成树理论,stp,rstp,mstp,pvst,pvst+比较（STP generation tree theory, STP, RSTP, MSTP, PVST, PVST + comparison）.doc

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STP生成树理论,stp,rstp,mstp,pvst,pvst比较（STPgenerationtreetheory,STP,RSTP,MSTP,PVST,PVSTcomparison）

STP生成树理论,stp,rstp,mstp,pvst,pvst+比较（STP generation tree theory, STP, RSTP, MSTP, PVST, PVST + comparison） Spanning tree protocol STP - Spanning Tree Protocol (Spanning Tree Protocol) logically disconnect loop, prevent the formation of network broadcast storm on the second floor, when the circuit malfunction, disconnect the cut-out (logical interface is activated, restore the communication, the backup route. SPT purpose is, by constructing a natural number way to achieve the purpose of blocking the redundant loop, can solve the broadcast storm, copy more frames, such as the MAC address table jitter problem, at the same time realize link backup and path optimization. The STP algorithm: Root path cost The root path cost (overhead) is the sum of the cost of all links in the path of the bridge to the root bridge, and the adaptive path overhead Link bandwidth cost (before revision) cost (revised) 10 GBPS 1 2 1 April 1000 MBPS 100 MBPS 10 19 10 MBPS, 100, 100 The bridge ID When using STP, the switch with the minimum network bridge ID will become the root bridge The bridge ID has 8 bytes, consisting of 2 bytes of priority and 6 bytes of bridge MAC address. The priority of the bridge is from 0 ~ 65535, and the default value is 32768 (0x8000). The bridge with the lowest priority will be the root bridge. If the root bridge has the same priority, compare the MAC address of the bridge, and the switch or bridge with the lowest MAC address will be the root bridge. Port ID The port ID also participates in determining the path to the root bridge. The port ID has 2 bytes, 1 byte of port priority and 1 byte of port number. The port priority is the number from 0 to 255, and the default value is 128 (0x80). The port number is arranged in the order of the port on the switch. The ID of the column 1/1 is 0x8001, and the ID of port 1/2 is 0x8002. The smaller the port priority, the higher the priority. If the port priority is the same, the smaller the number, the higher the priority. The pro