> ## Documentation Index
> Fetch the complete documentation index at: https://doc.lwops.cn/llms.txt
> Use this file to discover all available pages before exploring further.

# 华三配置环路检测

配置启用环路检测及环路后动作

```plain theme={null}
[FW1]loopback-detection global enable vlan all  //全局开启环路检测，并检测所有VLAN
[FW1]loopback-detection global action shutdown //出现环路时，采取的动作是shutdown
[FW1]loopback-detection interval-time 10  //指定环路检测的时间间隔为10秒
[FW1]int gi 1/0/2
[FW1-GigabitEthernet1/0/2]port link-mode bridge  //此指令可忽略，但是接口模式必须为二层接口方可配置环路检测
[FW1-GigabitEthernet1/0/2]loopback-detection enable vlan all //接口开启环路检测，并检测所有VLAN
[FW1-GigabitEthernet1/0/2]loopback-detection action shutdown  //出现环路时，采取的动作是shutdown
[FW1-GigabitEthernet1/0/2]quit
```

查看环路信息

```plain theme={null}
[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
```