Large-Scale IP Network Solutions (CCIE Professional Development)

RIP and Default Routes

The only route RIP understands as the default route is 0.0.0.0. It carries this route by default, which means that you do not have to specify it. For RIP to advertise a default route, it must find a route to the 0.0.0.0 network in its routing table. In the 11.3 software, a new feature exists, with which you can specify the router to send the default route on some interfaces, even if the router does not have a default route.

This command is as follows:

router ripdefault-information originate route-map advertise.route-map advertiseset interface serial 0.

This command sends a default route on serial 0, even when the local router does not have a default route in its routing table.