AS-Path Regular Expression Examples

Chapter 6: BGP Configuration Guide

aspath_term {m}

A regular expression followed by {m} (where m is a positive integer) means exactly m repetitions.

aspath_term {m,}

A regular expression followed by {m,} (where m is a positive integer) means m or more repetitions.

aspath_term *

An AS path term followed by * means zero or more repetitions. This is shorthand for {0,}.

aspath_term +

A regular expression followed by + means one or more repetitions. This is shorthand for {1,}.

aspath_term ?

A regular expression followed by ? means zero or one repetition. This is shorthand for {0,1}.

aspath_term aspath_term

Matches the AS term on the left, or the AS term on the right.

For example:

(4250 .*)	Means anything beginning with 4250
(.* 6301 .*)	Means anything with 6301.
(.* 4250)	Means anything ending with 4250.

(. * 1104112518881135 .*)

Means anything containing 1104 or 1125 or 1888 or 1135.

AS-path regular expressions are used as one of the parameters for determining which routes are accepted and which routes are advertised.

To import MCI routes with a preference of 165:

ip-router policy create bgp-import-source mciRoutes aspath-regular- expression "(.* 3561 .*)" origin any sequence-number 10

ip-router policy import source mciRoutes network all preference 165

76	SmartSwitch Router User Reference Manual

9032578-02 specifications

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Cabletron Systems 9032578-02 manual AS-Path Regular Expression Examples

Models: 9032578-02