增加交换机的镜像端口：
system-view
mirroring-group 1 local
mirroring-group 1 mirroring-port gigabitethernet 1/0/1 gigabitethernet 1/0/2 both 被监听的口
mirroring-group 1 monitor-port gigabitethernet 1/0/3 监听的口
display mirroring-group all
删除交换机已经镜像的端口：
undo mirroring-group 1