Routing policy determines how the router handles the routes it receives from and sends to BGP peers or other routing protocols. In many cases, routing policy consists of filtering routes, accepting certain routes, accepting and modifying other routes, and rejecting some routes. You can think of routing policy as a way to control the flow of routes into and out of the router.
You can use one or more of the following mechanisms to configure routing policy:
The remainder of this section provides detailed information about using these features with BGP. Before proceeding, please see JUNOSe IP Services Configuration Guide, for a thorough background on how these features work in general.