A.12 B.16 C.20 D.理论上无限制
A.255.255.255.252 B.255.255.255.248 C.255.255.255.240 D.255.255.255.224
A.PQ B.RED. C. WFQ D. WRED
A.G.652; B.G.653; C.G.654; D.G.655