Virtual Private Routed Network Services
7750 SR OS Services Guide Page 1379
The no form of the command removes the configured local-address for BGP.
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-address — The router ID is used when communicating with IBGP peers and the interface
address is used for directly connected EBGP peers.
ip-address — The local address expressed in dotted decimal notation. Allowed values are a valid
routable IP address on the router, either an interface or system IP address.
local-as
Syntax local-as as-number [private]
no local-as
Context config>service>vprn>bgp
config>service>vprn>bgp>group
config>service>vprn>bgp>group>neighbor
Description This command configures a BGP virtual autonomous system (AS) number.
In addition to the AS number configured for BGP in the config>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
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