Stub Area

An area into which no external routes are propagated. A stub area does not attach to any area except the backbone, and has no exit other than to the backbone area. You can, however, enable an area border router to create and inject the default route (0.0.0.0) into a stub area.

The default route is advertised to a stub area when you specify a cost---an integer from 0 to 15. Specifying a cost of 0 disables the command. Use the ComOS command from the command line interface (PortMaster==>Command) :

set ospf area Area stub-default-cost Number