
Customizing OSPF Services
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Configuring a Stub Area
A stub area does not import ASEs and may or may not import internal route
summaries. In place of routes to destinations outside the stub, a border router
connected to a stub area injects a default route advertisement. When an internal
router encounters a datagram addressed to a destination outside the stub area, the
router forwards it to the border router specified in the default route advertisement.
Assume, for example, that the stub area in Figure 1-6 on page 1-17 was
configured to import no internal or external routing information. Border router 8
receives ASEs and internal summaries from its interface to the backbone.
However, border router 8 does not flood the ASEs or summaries into the stub area.
Instead, it injects a default route that internal routers of the stub area use to
forward datagrams to destinations beyond the stub.
10. To change the default values for the range,
set one or more of the following
parameters:
• Enable
• Mask
• Status
• Metric
Click on Help or see the parameter
descriptions beginning on page A-54.
11. Click on Apply, and then click on Done. You return to the Configuration Manager
window.
Note:
If an OSPF area supports a router configured as an AS boundary router,
you cannot configure the area as a stub area. However, you can configure the
area as an NSSA (see “
Configuring a Not-So-Stubby Area (NSSA)” on page
6-51).
Site Manager Procedure
(continued)
You do this System responds
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