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Configuring Routing 355
Figure 8-11. OSPF Areas Page
Area ID
— The area ID. The format is an IP address.
Import Autonamous System External
— Indicates whether this is a stub area. Possible values are:
Import External —
Autonomous system external link state advertisements (LSA) can be
imported into the area
Import No External —
External LSAs cannot be imported into the area; therefore, this is a
stub area.
Area Summary
— Controls the import of summary LSAs into stub areas. This variable has no
effect on other areas. Possible values are:
No Area Summary
— Specifies that this is a totally stubby area.
Send Area Summary
— Specifies that this is not a totally stubby area.
A stub area is an area into which AS External LSAs are not flooded. Totally stubby areas use a
default route to reach not only destinations external to the autonomous system, but also all
destinations external to the area. To take advantage of the OSPF stub area support, default
routing must be used in the stub area.
Default Stub Metric (0-16777216)
— The metric of the default route created for the stub area.
Stub areas do not import external AS. Therefore, a default route is created by the area border router
for the stub area.
Metric Type
— The protocol metric type.