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Dell EMC Configuration Guide for the S3100 Series 9.14.2.4

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OSPFv3 NSSA

NSSA (Not-So-Stubby-Area) is a stub area that does not support Type-5 LSAs, but supports Type-7 LSAs to forward external links. Initially ASBR (Autonomous System Border Router) forwards the external links through Type-7 LSAs to the Area Border Router (ABR) of NSSA, which in turn converts them into Type-5 LSAs and forwards them to the rest of the OSPF domain.

NSSA Options

NOTE To support NSSA area, all the OSPF routers in that area should be configured with NSSA.
NSSA can be configured with the following options:
  1. Default-information-originate – To inject a default route using Type-7 LSAs — NSSA routers need to have access to the rest of the OSPF routers in the autonomous system. To facilitate this, the default route is injected into the NSSA area through a Type-7 LSA. This can be generated either by NSSA ASBR or NSSA ABR.
  2. No-redistribute – To restrict Type-7 LSAs — When NSSA ASBR is also an ABR, redistributed external routes need not be translated from Type-7 to Type-5 LSAs. ABR will directly inject external routes through Type-5 LSAs into the OSPF domain. It does not send Type-7 LSAs into the NSSA area.
  3. No-summary – To act as totally stubby area — NSSA area can be converted intoa totally stubby area to reduce the number of Type-3 LSAs. Once it is configured, NSSA ABR will inject Type-3 LSAs into the NSSA area for default routes. The remaining Type-3 LSAs are not allowed inside this area.

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