ECS4660-28F_Management Guide-R03

C HAPTER 51 | IP Routing Commands
Border Gateway Protocol (BGPv4)
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EXAMPLE
Console(config)#router bgp 100
Console(config-router)#
RELATED COMMANDS
network (1848)
ip as-path
access-list
This command configures an autonomous system path access list. Use the
no form with only the access list name to disable its use, or with all
parameters to remove a path attribute from the access list.
SYNTAX
ip as-path access-list access-list-name {deny | permit}
regular-expression
no ip as-path access-list access-list-name [{deny | permit}
regular-expression]
access-list-name – Name of the access list. (Maximum length:
16 characters, no spaces or other special characters)
deny – Permits access for messages with matching path attribute.
permit – Denies access to messages with matching path attribute.
regular-expression – Autonomous system in the access list
expressed as a regular expression
29
.
COMMAND MODE
Global Configuration
DEFAULT SETTING
No AS path access lists are defined.
COMMAND USAGE
◆ If the regular expression in an AS path list is matched, then the
deny/permit condition is applied to the routing message.
◆ Use this command in conjunction with the neighbor filter-list command
to filter route updates sent to or received from a neighbor, or with the
match as-path route map command to implement a more
comprehensive filter for policy-based routing.
29. Syntax complies with the IEEE POSIX Basic Regular Expressions (BRE) standard.