Alcatel-Lucent 6850-48 Guida Di Riferimento

BGP Commands

page 44-100

OmniSwitch CLI Reference Guide

Configures a policy action (either permit or deny a route from passing) to be taken for an AS path list 
when a match is found. Matching criteria are specified in the regular expression.

ip bgp policy aspath-list name “regular_expression” action {permit | deny}

AS path name, e.g., InboundAspath, ranging from 0 to 70 characters, or 
a value of none. The AS path name is case sensitive. 

Regular expression, e.g., “^100 200$” where 100 (followed by a space) 
represents the beginning of the list and 200 represents the end. The regu-
lar expression must be enclosed by quotation marks.

Allows matching routes to pass.

Stops matching routes from passing.

OmniSwitch 6850, 6855, 9000, 9000E

• A regular expression consists of a character string presented in the form of a pattern, e.g., ^100 200$. 

 for a table of valid regular expression characters 

(metacharacters). See also “Configuring BGP” in your Advanced Routing Guide for more information 
on using regular expressions in BGP commands.

• This command allows or stops AS path lists from being applied to a peer’s inbound and outbound 

routes configured via the 

 and 

commands. The AS path list filters routes based on one or more regular expressions, as shown in the 
example below. If the route matches the AS path list filter, then the permit or deny action (i.e., policy) 
associated with the regular expression applies.

• General or more specific AS path list information can be displayed by varying the use of the 

 command.

-> ip bgp policy aspath-list InboundAspath “^100 200$” action permit

-> ip bgp policy aspath-list OutboundAspath “^300 400$” action deny

Release 6.1; command was introduced.

permit