端口镜像是指设备复制从镜像端口流经的报文，并将此报文传送到指定的观察端口进行分析和监控。根据观察端口的不同，端口镜像分为本地端口镜像和二层远程端口镜像。
端口镜像
将一个镜像端口的报文复制到一个观察端口上。例如：将镜像端口GE2/0/1入方向的报文（即接收到的报文）复制到观察端口GE1/0/1上，GE1/0/1与监控设备直连。
system-view
[HUAWEI] observe-port 1 interface gigabitethernet 1/0/1
[HUAWEI] interface gigabitethernet 2/0/1
[HUAWEI-GigabitEthernet2/0/1] port-mirroring to observe-port 1 inbound
N端口镜像
将一个镜像端口的报文复制到N个不同的观察端口上。例如：将镜像端口GE2/0/1入方向的报文（即接收到的报文）复制到观察端口GE1/0/1～GE1/0/3上，GE1/0/1～GE1/0/3与监控设备直连。
观察端口逐个进行配置
system-view
[HUAWEI] observe-port 1 interface gigabitethernet 1/0/1
[HUAWEI] observe-port 2 interface gigabitethernet 1/0/2
[HUAWEI] observe-port 3 interface gigabitethernet 1/0/3
[HUAWEI] interface gigabitethernet 2/0/1
[HUAWEI-GigabitEthernet2/0/1] port-mirroring to observe-port 1 inbound
[HUAWEI-GigabitEthernet2/0/1] port-mirroring to observe-port 2 inbound
[HUAWEI-GigabitEthernet2/0/1] port-mirroring to observe-port 3 inbound
观察端口批量进行配置（V200R005及后续版本支持）
system-view
[HUAWEI] observe-port 1 interface-range gigabitethernet 1/0/1 to gigabitEthernet 1/0/3
[HUAWEI] interface gigabitethernet 2/0/1
[HUAWEI-GigabitEthernet2/0/1] port-mirroring to observe-port 1 inbound
配置N：1端口镜像
将N个镜像端口的报文复制到一个观察端口上。例如：将镜像端口GE2/0/1～GE2/0/3入方向的报文（即接收到的报文）复制到观察端口GE1/0/1上，GE1/0/1与监控设备直连。
system-view
[HUAWEI] observe-port 1 interface gigabitethernet 1/0/1
[HUAWEI] interface gigabitethernet 2/0/1
[HUAWEI-GigabitEthernet2/0/1] port-mirroring to observe-port 1 inbound
[HUAWEI-GigabitEthernet2/0/1] quit
[HUAWEI] interface gigabitethernet 2/0/2
[HUAWEI-GigabitEthernet2/0/2] port-mirroring to observe-port 1 inbound
[HUAWEI-GigabitEthernet2/0/2] quit
[HUAWEI] interface gigabitethernet 2/0/3
[HUAWEI-GigabitEthernet2/0/3] port-mirroring to observe-port 1 inbound
[HUAWEI-GigabitEthernet2/0/3] quit