=== R1 ===
hostname R1
ipv6 unicast-routing
interface Loopback0
 ipv6 address 2001:db8::1/128
exit
interface GigabitEthernet1
 ipv6 address 2001:db8:0:12::1/64
 ipv6 address FE80::1 link-local
 no shutdown
exit
router bgp 65001
 bgp router-id 10.255.0.1
 no bgp default ipv4-unicast
 neighbor 2001:db8:0:12::2 remote-as 65002
 address-family ipv6 unicast
  neighbor 2001:db8:0:12::2 activate
  network 2001:db8::1/128
 exit-address-family
end

=== R2 ===
hostname R2
ipv6 unicast-routing
interface Loopback0
 ipv6 address 2001:db8::2/128
exit
interface GigabitEthernet1
 ipv6 address 2001:db8:0:12::2/64
 ipv6 address FE80::2 link-local
 no shutdown
exit
router bgp 65002
 bgp router-id 10.255.0.2
 no bgp default ipv4-unicast
 neighbor 2001:db8:0:12::1 remote-as 65001
 address-family ipv6 unicast
  neighbor 2001:db8:0:12::1 activate
  network 2001:db8::2/128
 exit-address-family
end