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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？
  • 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.

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