Advanced IP Network Design (CCIE Professional Development)

Route Filtering in BGP

Because BGP focuses on administrative control of routing, it's only natural that it should have vast filtering capabilities—and it does have vast filtering capabilities! This is, in fact, one the most confusing areas of configuring BGP. The following sections discuss the filtering capabilities of BGP via route maps, set and match statements, prefix lists, and distribution lists.

Figure D-6. Next Hop on a Multi-Access Network

Filtering with Route Maps

Filtering in BGP on Cisco routers is typically done using route maps, which are constructed as a set of matches and sets within a sequence. The matches, for filtering, ...