You are designing an OSPF network with multiple areas of for a large client. Due to the size of the routing domain, all areas except the backbone area are configured as stub areas. A new requirement i

An NSSA supports redistribution of external routes via Type 7 LSAs generated within the area, which are translated to Type 5 only at the ABR when leaving the area. This allows the static route toward the partner organization to be redistributed into OSPF while preserving the reduced LSDB size benefit of a stub-like area.

Stub areas block all Type 5 external LSAs by design, so redistributing as OSPF E1 is not permitted without first changing the area type.

Converting to a normal area allows all Type 5 external LSAs from the entire OSPF domain to flood into area 100, unnecessarily increasing the LSDB size.

Stub areas cannot accept redistributed external routes by definition, so no static route can be injected into area 100 without a configuration change.