The OSPF NSSA Option
OSPF-NSSA
Open
Shortest
Path
First
not so stubby
area
routing
protocol
This document describes a new optional type of OSPF area, somewhat humorously referred to as a "not-so-stubby" area (or NSSA). NSSAs are similar to the existing OSPF stub area configuration option but have the additional capability of importing AS external routes in a limited fashion. [STANDARDS-TRACK]