loopback-detection enable #全局开启

loopback-detection interval-time <loopback-detection-time> <no-loopback-detection-time> #检测时间

loopback-detection specified-vlan <vlan-list> #指向vlan

loopback-detection control <shutdown|block|learning> #常规配置中断即可

loopback-detection control-recovery timeout <0-3600> #延时恢复时间