H3C\]loopback-detection global enable vlan all //全局开启环路检测，并对所有的VLAN生效 \[H3C\]loopback-detection interval-time 250 //配置环路检测的时间间隔为250秒 \[H3C\]int gi 1/0/1 \[H3C-GigabitEthernet1/0/1\]loopback-detection enable vlan all //接口开启环路检测，并对所有的VLAN生效 \[H3C-GigabitEthernet1/0/1\]loopback-detection action shutdown //当检测到环路时，环路检测会将此端口关闭 **查看环路检测的显示信息：** \[H3C\]dis loopback-detection Loopback detection is enabled. //环路检测已开启 Loopback detection interval is 250 second(s). //环路检测的时间间隔为250秒 No loopback is detected. //目前没有检测到环路
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