Reference Guide

Access Control Lists (ACL) | 283
Command
History
permit
e
Configure a filter to forward routes that match the route’s COMMUNITY attribute.
Syntax
permit {community-number | local-AS | no-advertise | no-export | quote-regexp
regular-expressions-list | regexp regular-expression}
Parameters
Defaults
Not configured
Version 8.3.19.0 Introduced on S4820T
Version 8.3.7.0 Introduced on S4810
Version 8.1.1.0 Introduced on E-Series ExaScale
Version 7.8.1.0 Increased name string to accept up to 140 characters. Prior to 7.8.1.0, names
are up to 16 characters long.
pre-Version 6.1.1.0 Introduced for E-Series
community-number
Enter the community number in AA:NN format where AA is the AS number
(2 bytes) and NN is a value specific to that autonomous system.
local-AS
Enter the keywords local-AS to drop all routes with the COMMUNITY
attribute of NO_EXPORT_SUBCONFED.
All routes with the NO_EXPORT_SUBCONFED (0xFFFFFF03)
community attribute must not be advertised to external BGP peers.
no-advertise
Enter the keywords no-advertise to drop all routes containing the
well-known community attribute of NO_ADVERTISE.
All routes with the NO_ADVERTISE (0xFFFFFF02) community attribute
must not be advertised to other BGP peers.
no-export
Enter the keywords no-export to drop all routes containing the well-known
community attribute of NO_EXPORT.
All routes with the NO_EXPORT (0xFFFFFF01) community attribute must
not be advertised outside a BGP confederation boundary.
regexp
regular-expression
Enter the keyword regexp followed by a regular expression. Use one or a
combination of the following:
• . = (period) matches on any single character, including white space
• * = (asterisk) matches on sequences in a pattern (zero or more sequences)
• + = (plus sign) matches on sequences in a pattern (one or more
sequences)
• ? = (question mark) matches sequences in a pattern (0 or 1 sequences).
You must enter an escape sequence (CNTL+v) prior to entering the ?
regular expression.
• [ ] = (brackets) matches a range of single-character patterns.
• ^ = (caret) matches the beginning of the input string. (If the caret is used
at the beginning of a sequence or range, it matches on everything BUT
the characters specified.)
• $ = (dollar sign) matches the end of the output string.
• _ = (underscore) matches a comma (,), left brace ({), right brace (}), left
parenthesis, right parenthesis, the beginning of the input string, the end
of the input string, or a space.
• | = (pipe) matches either character.