第28题: [简答题]OSPF的域间路由通告行为?问R1能够将AREA 1通告给AREA 0的域间路由在通告回AREA 1吗?为什么? 参考答案:
NO. This distance vector behavior prevent R1 advertise routes learn from area 1 back to area 1.
According to RFC 2328,there is a rule equivalent of a Distance Vector protocol’s split horizon logic.The rule is described as below: before ABR advertises a summary LSAs(including type 3 and type 4 LSA) to a attached area, if the next hop of the route in the routing table entry belong to the area itself, do not generate a summary-LSA for the route.