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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Maintaining Existing AS Numbers During an AS Migration

The local-as feature smooths out the BGP network migration operation and allows you to maintain existing ASNs during a BGP network migration.

When you complete your migration, be sure to reconfigure your routers with the new information and disable this feature.
Allow external routes from this neighbor. CONFIG-ROUTERBGP mode neighbor { IP address | peer-group-name local-as as number [no prepend]
  • Peer Group Name : 16 characters.
  • AS-number : 0 to 65535 (2-Byte) or 1 to 4294967295 (4-Byte) or 0.1 to 65535.65535 (Dotted format).
  • No Prepend: specifies that local AS values are not prepended to announcements from the neighbor.
Format: IP Address: A.B.C.D. You must use Configuring Peer Groups before assigning it to an AS. This feature is not supported on passive peer groups.

Example of the Verifying that Local AS Numbering is Disabled

The first line in bold shows the actual AS number. The second two lines in bold show the local AS number (6500) maintained during migration.

To disable this feature, use the no neighbor local-as command in CONFIGURATION ROUTER BGP mode. 

R2(conf-router_bgp)#show conf
                                 !
                                 router bgp 65123
                                 bgp router-id 192.168.10.2
                                 network 10.10.21.0/24
                                 network 10.10.32.0/24
                                 network 100.10.92.0/24
                                 network 192.168.10.0/24
                                 bgp four-octet-as-support
                                 neighbor 10.10.21.1 remote-as 65123
                                 neighbor 10.10.21.1 filter-list Laura in
                                 neighbor 10.10.21.1 no shutdown
                                 neighbor 10.10.32.3 remote-as 65123
                                 neighbor 10.10.32.3 no shutdown
                                 
                                  neighbor 100.10.92.9 remote-as 65192
                                    neighbor 100.10.92.9 local-as 6500
                                 
                                 neighbor 100.10.92.9 no shutdown
                                 neighbor 192.168.10.1 remote-as 65123
                                 neighbor 192.168.10.1 update-source Loopback 0

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