Route Filtering With Open Shortest Path First (OSPF) in IPv4

9, redistributing an Enhanced Interior Gateway Protocol (EIGRP) route into OSPF. The advertisement of an external network specified by a type 5 (AS External) LSA is not permitted into a stub or totally stubby area, or NSSA. It is allowed using a type 7 (NSSA External) LSA, generated by the ASBR. Only the ASBR in the NSSA can generate type 7

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