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520 Configuring Routing
Area Configuration
The OSPF Area Configuration
page lets you create a Stub area configuration and NSSA once you’ve
enabled OSPF on an interface through Routing
→
OSPF
→
Interface Configuration. At least one router
must have OSPF enabled for this web page to display.
To display the page, click Routing
→
OSPF
→
Area Configuration in the tree view. If a Stub Area has
been created, the fields in the Stub Area Information are available. If a NSSA has been created, the fields
in the NSSA Area Information are available.
Figure 9-7. OSPF Area Configuration
The OSPF Area Configuration page displays the following fields:
•
Area
— Select the area to be displayed from the drop-down menu. When an area is selected, fields in
the Stub Area Information are displayed.
•
Area ID
— The OSPF area. An Area ID is a 32-bit integer in dotted decimal format that uniquely
identifies the area to which a router interface connects.
•
External Routing
— A definition of the router's capabilities for the area, including whether or not AS-
external-LSAs are flooded into/throughout the area. If the area is a stub area, then these are the
possible options for which you may configure the external routing capability, otherwise the only option
is Import External LSAs.
•
SPF Runs
— The number of times that the intra-area route table has been calculated using this area's
link-state database. This is typically done using Dijkstra's algorithm.
•
Area Border Router Count
— The total number of area border routers reachable within this area. This
is initially zero, and is calculated in each SPF Pass.
•
Area LSA Count
— The total number of link-state advertisements in this area's link-state database,
excluding AS External LSAs.