Cisco Cisco IOS Software Release 12.2(27)SBC
BGP Support for Dual AS Configuration for Network AS Migrations
How to Configure Autonomous System Migration
5
Cisco IOS Release: Multiple releases (see the Feature History table)
Verifying Autonomous System Number Configuration
The show ip bgp and show ip bgp neighbors EXEC commands can be used to verify autonomous
system number for entries in the routing table and the status of this feature.
system number for entries in the routing table and the status of this feature.
SUMMARY STEPS
1.
enable
2.
show ip bgp [network] [network-mask] [longer-prefixes] [prefix-list prefix-list-name | route-map
route-map-name] [shorter prefixes mask-length]
route-map-name] [shorter prefixes mask-length]
3.
show ip bgp neighbors [neighbor-address] [received-routes | routes | advertised-routes | paths
regexp | dampened-routes | received prefix-filter]]
regexp | dampened-routes | received prefix-filter]]
Step 6
neighbor
ip-address remove-private-as
Example:
Router(config-router)# neighbor 10.0.0.1
remove-private-as
(Optional) Removes private autonomous-system numbers
from outbound routing updates.
from outbound routing updates.
•
This command can be used with the replace-as
functionality to remove the private autonomous-system
number and replace it with an external autonomous
system number.
functionality to remove the private autonomous-system
number and replace it with an external autonomous
system number.
•
Private autonomous-system numbers (64512 to 65535)
are automatically removed from the AS_PATH attribute
when this command is configured.
are automatically removed from the AS_PATH attribute
when this command is configured.
Step 7
end
Example:
Router(config-router)# end
Exits router configuration mode, and enters privileged
EXEC mode.
EXEC mode.
Command or Action
Purpose