Stub No Type 5 AS-external LSA allowed, accepts only 1,2,3 but no 4 totaly stubby No Type 3, 4 or 5 LSAs allowed except the default summary route NSS, accepts only 1,2 and route 0.0.0.0 NSSA No Type 5 AS-external LSAs allowed, but ABR converts type 7 to type 5. It accepts type 3 and 4 totaly NSSA No Type 3, 4 or 5 LSAs except the default summary route, but ABR converts type 7 to type 5.