Explanation/Reference:
Explanation:
NSSAs
Notice that Area 2 in Figure 11-5 has an ASBR. If this area is configured as an NSSA, it generates the
external LSAs (Type 7) into the OSPF system while retaining the characteristics of a stub area to the rest
of the autonomous system. There are two options for the ABR. First, the ABR for Area 2 can translate the
NSSA external LSAs (Type 7) to autonomous system external LSAs (Type 5) and Hood the rest of the
internetwork. Second, the ABR is not configured to convert the NSSA external LSAs to Type 5 external
LSAs, and therefore the NSSA external LSAs remain within the NSSA.
There is also an NSSA totally stub area. The difference is that the default NSSA has no default route
unless the ABR is explicitly configured to advertise one. The NSSA totally stub area docs receive a default
route.