Set As-Path - Allied Telesis AR2050V Command Reference Manual

BGP BGP4+ C
AND OMMANDS
-
SET AS PATH

set as-path

Overview Use this command to add an AS path set clause to a route map entry.
When a BGP update message matches the route map entry, the device prepends
the specified Autonomous System Number (ASN) or ASNs to the update's AS path
attribute.
The AS path attribute is a list of the autonomous systems through which the
announcement for the prefix has passed. As prefixes pass between autonomous
systems, each autonomous system adds its ASN to the beginning of the list. This
means that the AS path attribute can be used to make routing decisions.
Use the no variant of this command to remove the set clause.
set as-path prepend <1-65535> [<1-65535>]...
Syntax
no set as-path prepend [<1-65535> [<1-65535>]...]
Mode Route-map mode
Usage Use the set as-path command to specify an autonomous system path. By
specifying the length of the AS-Path, the device influences the best path selection
by a neighbor. Use the prepend parameter with this command to prepend an AS
path string to routes increasing the AS path length.
This command is valid for BGP update messages only.
To use entry 3 of the route map called myroute to prepend ASN 8 and 24 to the
Example
AS path of matching update messages, use the commands:
awplus#
awplus(config)#
awplus(config-route-map)#
Related match as-path
Commands
route-map
show route-map
C613-50186-01 Rev B
Parameter Description
prepend
Prepends the autonomous system path.
<1-65535>
The number to prepend to the AS path. If you specify multiple ASNs,
separate them with spaces.
configure terminal
route-map myroute permit 3
Command Reference for AR2050V
AlliedWare Plus™ Operating System - Version 5.4.7-1.x
set as-path prepend 8 24
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