Linux ip命令之UP、LOWER_UP和state UP/DOWN

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The LOWER_UP is the state of the Ethernet link (or other link layer protocol). It's defined as Driver signals L1 up, which basically means the cable is fitted and it can see another device on the other end of the cable. The UP means that it has been enabled. This can be controlled by you (or a script) using the ip link set <device> up of ifconfig <device> up command.



UP为接口物理状态的UP
state UP/DOWN为协议状态的UP/DOWN