The bridge with the lowest priority will be elected as the root bridge. The root bridge is the "central" bridge in the spanning tree.
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。
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。
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