An goverment network topology as below: Using Huawei AR-18-20 as the router, connectd with a hardware firewall. Using Huawei Quidway S5012P as the core switch.
The topology diagram:

Please follow below steps to configure port mirror of QuidwayS5012p:
[Quidway]monitor-port GigabitEthernet 0/5
[Quidway]mirroring-port GigabitEthernet 0/2
By now, you can monitor all computers in local network.