1) Common Area: OSPF areas are common areas by default. Common areas include standard areas and backbone areas. A backbone area connects all the other OSPF areas. It is usually named Area0.2) Stub Area3) Totally Stub Area4) NSSA (Not So Stuby Area)5) Totally NSSA (Totally Not So Stuby) Area
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Majid Javid , Senior Network Security Engineer (Auditor) , Bell Canada (End client Bank of Montreal)
Area Types: (1) Standard Area - Default OSFP area type (2) Stub Area - External link (type5) LSAs are replaced with a default route (3) Totally Stubby Area - Type3,4 and5 LSAs are replaced within a default route (4) Not So Stubby Area (NSSA) - A stub area containing an ASBR; type5 LSAs are converted to type7 within the area