Not So Stubby Area (NSSA) allows external routes to be advertised into the OSPF domain while retaining the other characteristics of stub area. When external routes are redistributed into a router in NSSA area, the router originates LSA Type 7 to advertise the new external destinations to routers within the NSSA area. The type seven LSAs are converted to LSA Type five when flooded into Area zero by the Area Boarder Router. LSA Type 5s cannot be existed in the NSSA Area.

The video will help in understanding OSPF Not So Stubby Area (NSSA) and totally Not So Stubby Area (Totally NSSA).

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