Edge-Core ECS4660-28F, Management Manual, Page: 1833 / 2020

C
HAPTER
51
| IP Routing Commands
Border Gateway Protocol (BGPv4)
– 1833 –
E
XAMPLE
Console(config)#router bgp 100
Console(config-router)#
R
ELATED
C
OMMANDS
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.
S
YNTAX
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 .
C
OMMAND
M
ODE
Global Configuration
D
EFAULT
S
ETTING
No AS path access lists are defined.
C
OMMAND
U
SAGE
◆
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.