Routing TCP/IP, Volume I (CCIE Professional Development)

Configuring Route Filters

Route filtering is accomplished by one of the following methods:

• Filtering specific routes, using the distribute-list command

• Manipulating the administrative distances of routes, using the distance command

Case Study: Filtering Specific Routes

Figure 13.2 shows a portion of an internetwork running RIPv2. Barkis is providing connectivity to the rest of the internet via Traddles. In addition to the 700 specific routes within BigNet, Traddles is advertising a default route to Barkis. Because of the default route, Barkis, Micawber, Peggotty, and Heep do not need to know the other 700 routes in BigNet. So the objective is to configure a filter at Barkis that will accept only the default route from Traddles and reject all ...