Routing protocols send information about routes to a router's neighbors. This information is processed and used to create routing tables, which are then distilled into forwarding tables. Routing policies control the flow of information between the routing protocols and the routing tables and between the routing tables and the forwarding tables. Using policies, you can determine which routes are advertised, specify which routes are imported into the routing table, and modify routes to control which routes are added to the forwarding table.
This overview contains the following topics: