###################
Router A
###################

Int Serial 6/0
   ipv6 address 2001:4830:1545::1/64
!
ipv6 route 2001:4830:1545::/48 2001:4830:1545::2
ipv6 route 2000::/3 2001:4830:1500:A3::1

###################
Router B
###################


Int Serial 5/0
 ipv6 address 2001:4830:1545:2::1/64
!
Int Serail6/0
 ipv6 address 2001:4830:1545::2/64
!

ipv6 route 2001:4830:1545:2::/63 2001:4830:1545:2::2
ipv6 route 2000::/3 2001:4830:1545::1

###################
Router C
###################

Int Serial 1/0/0
 ipv6 address 2001:4830:1545:2::2/64
!
ipv6 route 2000::/3 2001:4830:1545:2::1