Area nssa

IP Routing Commands 4

Command Usage

•All routers in a stub must be configured with the same area ID.

•Routing table space is saved in a stub by blocking Type-4 AS summary LSAs and Type 5 external LSAs. The default setting for this command completely isolates the stub by blocking Type-3 summary LSAs that advertise the default route for destinations external to the local area or the autonomous system.

•Use the area default-cost command to specify the cost of a default summary route sent into a stub by an ABR.

•This router supports up to 16 total areas (either normal transit areas, stubs, or NSSAs).

Example

This example creates a stub area 10.2.0.0, and assigns all interfaces with class B addresses 10.2.x.x to the stub.

Console(config-router)#area 10.2.0.0 stub Console(config-router)#network 10.2.0.0 0.255.255.255 area 10.2.0.0 Console(config-router)#

Related Commands

area default-cost(4-269)

This command defines 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

[no] area area-idnssa [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.

4-273

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Microsoft ES4649, ES4625 manual Area nssa, Related Commands Area default-cost4-269

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