Because the default time reference is None, the Metric selection will be displayed after indicating the desired time reference.
因为默认的时间引用是None，所以在指定想要的时间引用之后再显示指标选择。
When routes are redistributed between OSPF processes, are all SPF metrics preserved or is the default metric value used?
当路线之间的重新分配OSPF的进程，都是SPF级数据保存或是默认度量的价值使用呢？
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