Default Routes
A router’s default route matches the destination of all packets that are not matched by any other route in the IP routing table. In fact, a default route can be thought of as the ultimate summary route—a route for the prefix that includes all IPv4 addresses, as represented by prefix/length 0.0.0.0/0.
This section first examines the most common use of default routes inside an enterprise: to draw Internet traffic toward the Internet-connected routers without having to put routes for all Internet destinations into the enterprise routers’ routing tables. Following that, this section examines two methods for EIGRP to advertise the default route.
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