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.
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