Junos route policy

Note: When you specify an action that manipulates the route characteristics, the changes occur in a copy of the source route. The source route itself does not change. The effect of the action is visible only after the route is imported into or exported from the routing table. To view the source route before the routing policy has been applied, use the show route receive-protocol command. To view a route after an export policy has been applied, use the show route advertised-protocol command.


 http://www.juniper.net/documentation/en_US/junos13.3/topics/usage-guidelines/policy-configuring-actions-in-routing-policy-terms.html