Line protocol on the interface Vlan-interface215 is DOWN这是什么原因呀？是不是配置问题,应该怎么处理呀。

华为交换机中出现The line protocol on the interface Vlanif9 has entered the DOWN state的原因是? Line protocol on the interface Vlan-interface215 is DOWN这是什么原因呀？是不是配置问题,应该怎么处理呀。 on the line是什么意思 模拟器总是提示line protocol is down 翻译：chai on the line On the line just for is still on the line. put my reputation on the line for youon the line - on the line还是on line?表示“打电话的女人”是the woman on line还是the woman on the line?line前到底有没有定冠词? hold on line 和 hold the line 的区别 Please write on the paper ___ line. Love Is On The Line 歌词 on the line 翻译成汉语. On the line just for you have something on the line 是什么意思 Put your heart on the line Lover on the line是谁唱的 She was h___her washing on the line