Cisco ASR 9000 Series Configuration Guide

Regular expression matching is CPU intensive. The policy performance can be substantially improved by
either collapsing the regular expression patterns together to reduce the total number of regular expression
invocations or by using equivalent native as-path match operations such as ‘as-path neighbor-is’, ‘as-path
originates-from’ or ‘as-path passes-through’.
Note
Inline Set Form
The inline set form is a parenthesized list of comma-separated expressions, as follows:
(ios-regex '_42$', ios-regex '_127$')
This set matches the same AS paths as the previously named set, but does not require the extra effort of
creating a named set separate from the policy that uses it.
community-set
A community-set holds community values for matching against the BGP community attribute. A community
is a 32-bit quantity. Integer community values must be split in half and expressed as two unsigned decimal
integers in the range from 0 to 65535, separated by a colon. Single 32-bit community values are not allowed.
The following is the named set form:
Named Set Form
community-set cset1
12:34,
12:56,
12:78,
internet
end-set
Inline Set Form
(12:34, 12:56, 12:78)
($as:34, $as:$tag1, 12:78, internet)
The inline form of a community-set also supports parameterization. Each 16-bit portion of the community
may be parameterized. See the Parameterization, on page 480 for more information.
RPL provides symbolic names for the standard well-known community values: internet is 0:0, no-export is
65535:65281, no-advertise is 65535:65282, and local-as is 65535is-empty:65283.
RPL also provides a facility for using wildcards in community specifications. A wildcard is specified by
inserting an asterisk (*) in place of one of the 16-bit portions of the community specification; the wildcard
indicates that any value for that portion of the community matches. Thus, the following policy matches all
communities in which the autonomous system part of the community is 123:
community-set cset3
123:*
end-set
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
470 OL-30423-03
Implementing Routing Policy
Routing Policy Language Overview

Cisco ASR 9000 Series Specifications

General

Brand	Cisco
Model	ASR 9000 Series
Category	Network Router
Language	English