Stub/totally stub/nssa/totally nssa

Stub area: LSA type 1/2/3 are allowed, LSA type 4/5/7 are not allowed, no ASBR is allowed default route is injected automatically when stub area is configured on ABR

Totally stub area: LSA type 1/2 are allowed,,a default route is injected automatically, this default route is an only allowed type 3 LSA. LSA type 4/5/7 are not allowed.

Not so stub area: LSA type 1/2/3/7 is allowed, LSA type 4/5 are not allowed, ASBR is allowed. default route need to be configured manually with command: area <area id> nssa default-information originate. This default route will be advertisized as LSA type 7

Totally Not So Stub area: LSA type 3/4/5 is not allowed, LSA type 1/2/7 allowed. default route need to be configured manually with command: area <area id> nssa default-information originate. This default route will be advertisized as LSA type 7

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