If you have multiple ports, define the default port and (optionally) a port selection mediation in this step.
如果有多个端口，则在这一步定义缺省端口和(可选)端口选择中介。
This metric is used in the designated port and root port selection algorithms.
该指标用于在指定端口和根端口选择算法。
This metric is used in the designated port and root port selection algorithms.
该指标用于在指定端口和根端口选择算法。
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