Table 523 Local-Preference Command - Nokia 7302 Manual

Virtual Private Routed Network Service
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7.10.9.26
Table 523
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512
Item Description
Description This command configures a BGP virtual autonomous system (AS) number.
In addition to the AS number configured for BGP in the
configure>router>autonomous-system context, a virtual (local) AS number is
configured.The virtual AS number is added to the as-path message before the router's AS
number makes the virtual AS the second AS in the as-path.
This configuration parameter can be set at three levels: global level (applies to all peers), group
level (applies to all peers in peer-group) or neighbor level (only applies to specified peer). Thus,
by specifying this at each neighbor level, it is possible to have a separate as-number per EBGP
session.
When a command is entered multiple times for the same AS, the last command entered is used
in the configuration. The private attribute can be added or removed dynamically by reissuing
the command.
Changing the local AS at the global level in an active BGP instance causes the BGP instance
to restart with the new local AS number. Changing the local AS at the global level in an active
BGP instance causes BGP to re-establish the peer relationships with all peers in the group with
the new local AS number. Changing the local AS at the neighbor level in an active BGP
instance causes BGP to re-establish the peer relationship with the new local AS number.
This is an optional command and can be used in the following circumstance:
Provider router P is moved from AS1 to AS2. The customer router that is connected to P,
however, is configured to belong to AS1. To avoid reconfiguring the customer router, the
local-as value on router P can be set to AS1. Thus, router P adds AS1 to the as-path message
for routes it advertises to the customer router.
The no form of the command used at the global level will remove any virtual AS number
configured.
The no form of the command used at the group level reverts to the value defined at the global
level.
The no form of the command used at the neighbor level reverts to the value defined at the
group level.
Default no local-as
Parameters as-number — The virtual autonomous system number, expressed as a decimal integer.
Values: 1 — 65535
private — Specifies the local-as is hidden in paths learned from the peering.
local-preference
local-preference command
Item Description
Syntax local-preference local-preference
no local-preference
Context configure>service>vprn>bgp
configure>service>vprn>bgp>group
configure>service>vprn>bgp>group>neighbor
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