Policy Terminology
A policy is a mechanism in the JUNOS policy framework that allows you to configure criteria against which something can be compared and an action that is performed if the criteria are met.
All policies provide two points at which you can control routing information or packets through the router (see Figure 8.4). These control points allow you to control routing information before and after it is placed in the routing table, data packets before and after a forwarding table lookup, and local packets before and after they are received by the Routing Engine. (Figure 8.4 appears to depict only one control point, but because of the bidirectional flow of the local packets, two control points actually exist.)
Figure 8.4. Policy Control ...
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