The configurations of all the devices in this example are as below:
The configuration of Router A:
!
router bgp 65530
bgp confederation identifier 100
bgp confederation peers 65531
bgp log-neighbor-changes
neighbor 10.0.3.2 remote-as 65530
neighbor 10.0.4.4 remote-as 65530
The configuration of Router B:
!
router bgp 65530
bgp confederation identifier 100
bgp log-neighbor-changes
neighbor 192.168.5.4 remote-as 65530
The configuration of Router C:
!
router bgp 65531
bgp confederation identifier 100
bgp confederation peers 65530
bgp log-neighbor-changes