串行接口故障排错

l  Serial x is down, line protocol is down

l  Serial x is up, line protocol is down

l  Serial x is up, line protocol is up (looped)

l  Serial x is up, line protocol is down (disabled)

l  Serial x is administratively down, line protocol is down

 

Cisco 版本的 HDLC 是专有版本,它增加了一个协议类型字段。因此,Cisco HDLC 只能用于连接其它 Cisco 设备。)

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