This setting selects which specific tag format PPPoE Plus uses when it inserts subscriber-identifying information into PPPoE packets: a standard, vendor-neutral format or a Huawei-specific format expected by Huawei BRAS/access equipment. An administrator picks the type that matches whatever upstream broadband access server is terminating the PPPoE sessions, since the two formats aren't interchangeable and a mismatch would mean the access server can't parse the inserted subscriber information. For example, an ISP running a Huawei BRAS would set this to the huawei(1) type so the inserted tags are formatted the way that specific equipment expects.