Configuring a stub area

Configure stub areas to control external advertisements flooding and to minimize the size of the topological databases on an area's routers. A stub area cannot also be configured as an NSSA.

By default, summary route advertisements are sent into stub areas. The no form of the summary command disables sending summary route advertisements and only the default route is advertised by the ABR. This example retains the default so the command is not entered.

If this area is configured as a transit area for a virtual link, then existing virtual links of a non-stub or NSSA area are removed when its designation is changed to NSSA or stub.

Use the following syntax to configure virtual links.

ospf
        area area-id
        stub
            default-metric metric
            summaries

ALA-A>config>router>ospf>area># info
----------------------------------------------
...
            area 0.0.0.0
            exit
            area 0.0.0.20
                stub
                exit
            exit
...
----------------------------------------------
ALA-A>config>router>ospf#