Router
A
interface loopback 0
ip address 215.10.7.1 255.255.255.255
router
bgp 100
network
220.220.1.0
neighbor
215.10.7.2 remote-as 100
neighbor
215.10.7.2 update-source loopback0
neighbor
215.10.7.3 remote-as 100
neighbor 215.10.7.3 update-source loopback0
Router
B
interface loopback 0
ip address 215.10.7.2 255.255.255.255
router
bgp 100
network
220.220.5.0
neighbor
215.10.7.1 remote-as 100
neighbor
215.10.7.1 update-source loopback0
neighbor
215.10.7.3 remote-as 100
neighbor 215.10.7.3 update-source loopback0