生成树拓扑内的网桥共同选举出根网桥。
A root bridge is elected as the root of the spanning-tree topology.
那些没必要直接和根网桥通信的端口都被置为阻塞状态。
All ports that are not needed to reach the root bridge are placed in blocking mode.
最低优先级的网桥将被视为根结点网桥。根网桥是生成树的中心网桥。
The bridge with the lowest priority will be elected as the root bridge. The root bridge is the "central" bridge in the spanning tree.
配置BPDU携带了根网桥id和路径花费信息，并通过当前活动的路径传送。
The configuration BPDUs flow through all active paths, which provides the root BID and path cost information.
如果数据是根网桥产生的，那么花费就是0，如果经过了三个网段抵达根网桥的话，那么花费值就是200 (100 + 100 + 0)。
If the segment is attached to the root bridge, it has a cost of 0. For example, if the data has to travel over three 10 Mbps segments to reach the root bridge, the cost is 200 (100 + 100 + 0).
如果所有网桥都具备相同的优先值，MAC地址最小的网桥将被选举为根。
If all Bridges have the same bridge priority, the bridge with the lowest MAC address is selected as the root.
如果所有网桥都具备相同的优先值，MAC地址最小的网桥将被选举为根。
If all Bridges have the same bridge priority, the bridge with the lowest MAC address is selected as the root.
应用推荐