Routing Policy Overview

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. For more information, see the JUNOS Policy Framework Configuration Guide.

Routing policies are made up of one or more terms, each of which contains a set of match conditions and a set of actions. Match conditions are criteria that a route must match before the actions can be applied. If a route matches all criteria, one or more actions are applied to the route. These actions specify whether to accept or reject the route, control how a series of policies are evaluated, and manipulate the characteristics associated with a route.

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