C613-50631-01 Rev A Command Reference for IE340 Series 1381
AlliedWare Plus™ Operating System - Version 5.5.3-0.x
BGP AND BGP4+ COMMANDS
IP
AS-PATH ACCESS-LIST
ip as-path access-list
Overview This command defines a BGP and BGP4+ Autonomous System (AS) path access list.
The named AS path list is a filter based on regular expressions. If the regular
expression matches the AS path in a BGP update message, then the permit or deny
condition applies to that update. Use this command to define the BGP access list
globally, then use neighbor configuration commands to apply the list to a
particular neighbor.
The no variant of this command disables the use of the access list. Before deleting
an AS path access list, delete references to the access list from any route-maps and
BGP filters that use it.
Syntax
ip as-path access-list <listname> {deny|permit} <reg-exp>
no ip as-path access-list <listname> {deny|permit} <reg-exp>
Regular expressions listed below can be used with the ip as-path-access-list
command:
Parameter Description
<listname> Specifies the name of the access list.
deny Denies access to matching conditions.
permit Permits access to matching conditions.
<reg-exp> Specifies a regular expression to match the BGP AS paths.
Symbol Character Meaning
^ Caret Used to match the beginning of the input string. When used
at the beginning of a string of characters, it negates a pattern
match.
$ Dollar sign Used to match the end of the input string.
. Period Used to match a single character (white spaces included).
* Asterisk Used to match none or more sequences of a pattern.
+ Plus sign Used to match one or more sequences of a pattern.
? Question
mark
Used to match none or one occurrence of a pattern.
_ Underscore Used to match spaces, commas, braces, parenthesis, or the
beginning and end of an input string.
[ ] Brackets Specifies a range of single-characters.
- Hyphen Separates the end points of a range.
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