Juniper JUNOSE, Руководство по настройке

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Prefix trees
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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 71.
Table 14: Commands That Create Match-and-Set Route Maps
global import map aggregate-address attribute-map
neighbor route-map in bgp dampening route-map
neighbor route-map out export map
redistribute route-map import map
table-map global export map
BGP supports the clauses listed in Table 15 on page 71 for match-and-set route maps.
Table 15: Clauses Supported in BGP Match-and-Set Route Maps
set as-path prepend match as-path
set comm-list delete match community
set community match distance
set dampening match extcommunity
set extcommunity match ip address
set ip next-hop match ip next-hop
set local-preference match level
Configuring BGP Routing Policy
■ 71
Chapter 1: Configuring BGP Routing