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3-329
Configuring NSSA Settings
Use the OSPF / NSSA Settings page to configure a not-so-stubby area
(NSSA), and to control the use of default routes for ABRs and ASBRs, or
external routes learned from other routing domains and imported via an
ABR. (For a detailed description of NSSA areas, refer to “Configuring
OSPF Areas” on page 3-309.)
Command Attributes
• Area ID – Identifier for an not-so-stubby area (NSSA).
• Default Information Originate – An NSSA ASBR originates and
floods Type-7 external LSAs throughout its area for known network
destination outside of the AS. However, you can also configure an NSSA
ASBR to generate a Type-7 “default” route to areas outside of the AS, or
an NSSA ABR to generate a Type-7 “default” route to other areas within
the AS. (Default: Disabled)
• No Redistribution – The Redistribute Configuration page (page 3-327)
is used to import information from other routing domains (or protocols)
into the AS. However, when the router is an NSSA ABR, you can choose
whether or not to accept external routes learned from routers in other
OSPF areas into the NSSA. (Default: Enabled)
Note: This router supports up 16 areas, either normal transit areas, stubs,
or NSSAs.