哈哈,刚刚也查了一下英文版的,定义如下:
Non-designated ports have no role to play and hence are put into blocking mode.
非指定的端口有没有发挥作用,因此成阻塞模式
同时,
Nondesignated portort with a higher cost than the designated port that will be put in blocking mode—a nondesignated port is not a forwarding port.