NSSA
Not-so-stubby-area. In OSPF, an area similar to a stub area except that Type 1 and Type 2 external routes can be learned from it. Any external routes learned from an NSSA are translated into Type 1 and Type 2 external routes for the backbone area or other areas that accept external routes. Like stub areas, NSSAs can have default costs set for them but cannot have external routes advertised into them.