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Chapter 6: BGP Configuration Guide
76 SmartSwitch Router User Reference Manual
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.
(. * 1104|1125|1888|1135 .*)
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.
AS-Path Regular Expression Examples
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