How to Test PPPoE in OLT

Hello friend,
You can use PPPoE emulation function:
In PPPoE dialup emulation, an access device emulates an end user and initiates PPPoE dialup. According to the PPPoE dialup emulation result (successful or failed), users can determine the network connectivity between the access device and the broadband remote access server (BRAS). If a fault has occurred in the network, PPPoE dialup emulation helps users quickly identify whether the fault is on the network side or user side.

you can configuration refer to the prodoct document below:
https://support.huawei.com/hedex/hdx.do?docid=EDOC1000171625&id=feature_3727_2&lang=en

any problem can ask me, thanks.