router bgp 65500
 bgp router-id 12.12.12.12
 no bgp network import-check
 neighbor 192:2::100 remote-as 65500
 address-family ipv4 unicast
  no neighbor 192:2::100 activate
 !
 address-family ipv6 unicast
  neighbor 192:2::100 activate
  network 172:31::12/128
 exit-address-family
!