route policy sets the local preference attribute of the route to 31. In any case, the policy instructs the protocol
to accept the route.
community-set quickstart-communities
987:654,
987:543,
987:321,
987:210
end-set
route-policy quickstart-localpref
if community matches-any quickstart-communities then
set local-preference 31
endif
pass
end-policy
Persistent Remarks
The following example shows how comments are placed in the policy to clarify the meaning of the entries in
the set and the statements in the policy. The remarks are persistent, meaning they remain attached to the policy.
For example, remarks are displayed in the output of the show running-config command. Adding remarks to
the policy makes the policy easier to understand, modify at a later date, and troubleshoot if an unexpected
behavior occurs.
prefix-set rfc1918
# These are the networks defined as private in RFC1918 (including
# all subnets thereof)
10.0.0.0/8 ge 8,
172.16.0.0/12 ge 12,
192.168.0.0/16 ge 16
end-set
route-policy quickstart-remarks
# Handle routes to RFC1918 networks
if destination in rfc1918 then
# Set the community such that we do not export the route
set community (no-export) additive
endif
end-policy
Routing Policy Configuration Basics
Route policies comprise series of statements and expressions that are bracketed with the route-policy and
end-policy keywords. Rather than a collection of individual commands (one for each line), the statements
within a route policy have context relative to each other. Thus, instead of each line being an individual
command, each policy or set is an independent configuration object that can be used, entered, and manipulated
as a unit.
Each line of a policy configuration is a logical subunit. At least one new line must follow the then , else ,
and end-policy keywords. A new line must also follow the closing parenthesis of a parameter list and the
name string in a reference to an AS path set, community set, extended community set, or prefix set. At least
one new line must precede the definition of a route policy, AS path set, community set, extended community
set, or prefix set. One or more new lines can follow an action statement. One or more new lines can follow a
comma separator in a named AS path set, community set, extended community set, or prefix set. A new line
must appear at the end of a logical unit of policy expression and may not appear anywhere else.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
555
Implementing Routing Policy
Routing Policy Configuration Basics
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