HUAWEI-SNMP-EXT-MIB is used to enable and disable the status of the SNMP extended error codes.
The OID of the root object is:
iso(1).org(3).dod(6).internet(1).private(4).enterprises(1).huawei(2011).huaweiMgmt(5).hwDatacomm(25).hwSnmpExtMIB(164)