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Access Control Lists (ACL)
Figure 9-15. Command Example: ip as-path access-list
FTOS(conf)#ip as-path access-list TestPath
FTOS(config-as-path)#
Use the
match as-path
or
routes.
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
match as-path
Match on routes contain a specific AS-PATH.
neighbor filter-list
Configure filter based on AS-PATH information.
Create a filter to forward BGP routes that match the route's AS-PATH attributes. Use regular
expressions to identify which routes are affected by this filter.
permit as-regular-expression
as-regular-expression
Not configured
AS-PATH ACL
Version 8.1.1.0
Introduced on E-Series ExaScale
pre-Version 6.1.1.0
Introduced for E-Series
neighbor filter-list
commands to apply the AS-PATH ACL to BGP
Enter a regular expression to match BGP AS-PATH attributes.
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.
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