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CCNP Routing and Switching ROUTE 300-101: Official Cert Guide by Kevin Wallace

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Stubby Areas

ImageLesson 4: Stubby and Totally Stubby Area Configuration

As mentioned earlier, the two most common reasons to consider using default routes are to drive all Internet-destined traffic toward Internet-connected routers in an enterprise and to drive traffic inside an area toward an ABR in that area. This second design choice allows the routers in an area to use default routes for forwarding packets to ABRs, rather than more specific routes. Using default routes inside an area reduces memory consumption and CPU processing time on routers inside the area, because the routers in that area can have fewer LSAs in their LSDBs.

The OSPF stub router ...

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