The figure shows all the possible applications of prefix-lists, filter-lists, weights, and route-maps. They are applied in the order indicated.
Prefix-lists and filter-lists, both in and out, filter out routes and discard those that are not permitted. Weight setting is applicable only on incoming routes because a router never propagates the weight attribute to its neighbors. Route-maps can be filters that discard routes but can also be used to modify and set various attributes on both incoming and outgoing routes.
4-16 Configuring BGP on Cisco Routers (BGP) v3.2 © 2005, Cisco Systems, Inc.
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