Juniper IP SERVICES - CONFIGURATION GUIDE V 11.1.X Configuration Manual page 40

JUNOSe 11.1.x IP Services Configuration Guide
set as-path prepend
set automatic-tag
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Route Maps
Use to define the conditions for redistributing routes from one routing protocol
to another, and for filtering or modifying updates sent to or received from peers.
Each route-map command has a list of match and set commands associated
with it. That is, the route map itself consists of a set of clauses; each clause (also
called an entry) consists of a match or set command:
match commands specify the match criteria, the conditions under which
redistribution is allowed for the current route map.
set commands specify the set actions, the redistribution actions to perform
if the criteria enforced by the match commands is met.
You can specify match and set clauses to modify attributes of redistributed routes.
Use route maps when you want to have detailed control over how routes are
redistributed between routing processes.
You specify the destination routing protocol with the router command.
You specify the source routing protocol with the redistribute command.
Example
host1(config)#route-map nyc1 permit 10
host1(config-route-map)#match ip address list1
host1(config-route-map)#set metric-type internal
Use the no version to delete the route map.
See route-map.
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.
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 device can influence
the best path selection by a peer farther away.
Example
host1(config-route-map)#set as-path prepend list list10
Use the no version to delete the set clause from a route map.
See set as-path prepend.
Use to automatically compute the tag value of the destination routing protocol.
Example
host1(config-route-map)#set automatic-tag
Use the no version to delete the set clause from a route map.
See set automatic-tag.