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端口的物理层Up,可是协议Down,也许的要素有很多种。一般来说,链路层协议从初始化到Up起来,都会通过一个协议的“洽谈”进程。这儿所说的洽谈是广义上的洽谈

(The physical layer of the port is Up, but the protocol is Down. There may be many factors. Generally speaking, the link layer protocol will go through a protocol "negotiation" process from initialization to Up. The negotiation mentioned here is a negotiation in a broad sense.)

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