A.IPB.ICMPC.ARPD.RARP
A.255.255.255.252 B.255.255.255.248 C.255.255.255.240 D.255.255.255.196
A.Hello B.Keepalive C.SPF(最短路徑優(yōu)先) D.LSU(鏈路狀態(tài)更新)