Hello, friend!
The configuration of MAC address filtering for Huawei ONTs is as follows:
On the ONT web page, go to the page for configuring MAC address filtering on a wireless network. Then perform configuration on the page.
Before the configuration, ensure that your Huawei ONT has been connected to the network and can access the Internet.

Note: The web page may vary according to ONTs. The actual web page prevails.
Enable WLAN MAC Filter: Select it to enable MAC address filtering on a wireless network.
Filter Mode:
1. Blacklist: Devices in this list are not allowed to access the network.
2. Whitelist: Only devices in this list are allowed to access the network.
Note: The blacklist and whitelist modes are configured globally, and cannot be used at the same time.
SSID Index: Specify the SSID index of the WLAN that needs MAC address filtering.
Source MAC Address: Specify the MAC address of the device in the configured filtering mode.
Tip: You can obtain an SSID index corresponding to the SSID name (Wi-Fi name) from wireless network information displayed on the ONT web page.

How to Configure MAC Address Filtering on a Wired Network
On the ONT web page, go to the page for configuring MAC address filtering on a wired network. Then perform configuration on the page.
Before the configuration, ensure that your Huawei ONT has been connected to the network and can access the Internet.

Note: The web page may vary according to ONTs. The actual page prevails.
Enable MAC Filter: Select it to enable MAC address filtering.
Filter Mode:
1. Blacklist: Devices in this list are not allowed to access the network.
2. Whitelist: Only devices in this list are allowed to access the network.
Note: The blacklist and whitelist modes are configured globally, and cannot be used at the same time.
Source MAC Address: Specify the MAC address of the device in the configured filtering mode.
Thanks!