The configuration roadmap for V200R002 and earlier versions is as follows:
Configuration roadmap:
1. Run the snmp-agent sys-info version v3 command to set the SNMP version to SNMPv3.
2. Run the snmp-agent group v3 group-name command to configure an SNMP user group.
3. Run the snmp-agent usm-user v3 user-name group-name command to configure an SNMP user in the user group.
4. Run the snmp-agent target-host trap address udp-domain ip-address params securityname security-name v3 command to configure the destination IP address of the traps.

For example:

[HUAWEI] snmp-agent
[HUAWEI] snmp-agent sys-info version v3
[HUAWEI] snmp-agent group v3 some_group
[HUAWEI] snmp-agent usm-user v3 some_user some_group
[HUAWEI] snmp-agent target-host trap address udp-domain 10.10.10.10 params securityname some_user v3

The configuration roadmap for V200R003 is as follows:

1. Run the snmp-agent sys-info version v3 command to set the SNMP version to SNMPv3.
2. Run the snmp-agent group v3 group-name command to configure an SNMP user group.
3. Run the snmp-agent usm-user v3 user-name group group-name command to configure an SNMP user in the user group.
4. Run the snmp-agent target-host trap address udp-domain ip-address params securityname security-name v3 command to configure the destination IP address of the
traps.

For example:

[HUAWEI] snmp-agent
[HUAWEI] snmp-agent sys-info version v3
[HUAWEI] snmp-agent group v3 some_group
[HUAWEI] snmp-agent usm-user v3 some_user group some_group
[HUAWEI] snmp-agent target-host trap address udp-domain 10.10.10.10 params securityname some_user v3

Thank you for sharing.