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area nssa
Use this command to define a not-so-stubby area (NSSA). To remove an
NSSA, use the no form without any optional keywords. To remove an
optional attribute, use the no form without the relevant keyword.
Syntax
area area-id nssa [no-redistribution] [default-information-originate]
no area area-id nssa [no-redistribution]
[default-information-originate]
• area-id - Identifies the NSSA.
(The area ID must be in the form of an IP address.)
• no-redistribution - Use this keyword when the router is an NSSA
Area Border Router (ABR) and you want the redistribute command
to import routes only into normal areas, and not into the NSSA. In
other words, this keyword prevents the NSSA ABR from advertising
external routing information (learned via routers in other areas) into
the NSSA.
• default-information-originate - When the router is an NSSA Area
Border Router (ABR) or an NSSA Autonomous System Boundary
Router (ASBR), this parameter causes it to generate Type-7 default
LSA into the NSSA. This default provides a route to other areas
within the AS for an NSSA ABR, or to areas outside the AS for an
NSSA ASBR.
Command Mode
Router Configuration
Default Setting
No NSSA is configured.
Command Usage
• All routers in a NSSA must be configured with the same area ID.
• An NSSA is similar to a stub, because when the router is an ABR, it can
send a default route for other areas in the AS into the NSSA using the
default- information-originate keyword. However, an NSSA is
different from a stub, because when the router is an ASBR, it can