Juniper BGP, Configuration Manual

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results of the new policy, you must use the clear ip bgp peer-group command
to perform a hard clear or outbound soft clear of the peer group. You cannot
merely perform a hard clear or outbound soft clear for individual peer group
members because that causes BGP to resend only the contents of the Adj-RIBs-Out
table.
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Example
host1(config)# rneighbor 192.168.5.34 route-map nyc1 in
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Use the no version to remove the route map.
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See neighbor route-map.
route-map
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Use to define the conditions for redistributing routes from one routing protocol
into another, and for filtering or modifying updates sent to or received from
peers.
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Each route-map command has a list of match and set commands associated
with it.
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The match commands specify the match criteria—the conditions under which
redistribution is allowed for the current route map.
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The set commands specify the set actions—the redistribution actions to perform
if the criteria enforced by the match commands are set.
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Use route maps when you wish to have detailed control over how routes are
redistributed between routing processes.
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The destination routing protocol is the one you specify with the router command.
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The source routing protocol is the one you specify with the redistribute command.
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A clause with multiple values matches a route having any of the values; that is,
the multiple values are logical ORed.
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If you specify a BGP peer group by using the peerGroupName argument, all the
members of the peer group inherit the characteristic configured with this
command unless it is overridden for a specific peer.
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Example
host1(config)# route-map nyc1 permit 10
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Use the no version to delete the route map.
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See route-map.
set as-path prepend
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Use to modify an AS path for BGP routes by prepending one or more AS numbers
or a list of AS numbers to the path list.
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The only global BGP metric available to influence the best-path selection is the
AS-path length. By varying the length of the AS path, a BGP speaker can influence
the best-path selection by a peer farther away.
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Example
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Configuring BGP Routing Policy
JUNOSe 11.1.x BGP and MPLS Configuration Guide