host1(config-router)#neighbor 10.12.12.2 advertise-map default exist-map test
host1(config-router)#neighbor 10.12.12.2 default-originate
host1(config-router)#neighbor 10.12.12.2 route-map outbound out
host1(config-router)#exit
Configuring BGP Routing Policy
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:
•
Access lists
•
Community lists
•
Prefix lists
•
Prefix trees
•
Route maps
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.
Types of BGP Route Maps
A route map consists of match clauses and set clauses. Match clauses, which consist of
a match command, specify the attribute values that determine whether a route matches
the route map. Set clauses, which consist of a set command, modify the specified
attributes of routes that pass all match clauses in the route map.
BGP route maps can be applied to inbound routes, outbound routes, and redistributed
routes. BGP route maps are of two types, those that support both match and set clauses,
and those that support only match clauses.
The match-and-set route maps consist of the route maps configured with any of the
commands listed in Table 14 on page 70.
Table 14: Commands That Create Match-and-Set Route Maps
global import mapaggregate-address attribute-map
neighbor route-map inbgp dampening route-map
neighbor route-map outexport map
redistribute route-mapimport map
table-mapglobal export map
Copyright © 2010, Juniper Networks, Inc.70
JunosE 11.2.x BGP and MPLS Configuration Guide
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