R1#sh run | b 0/1
interface Ethernet0/1
 no ip address
 half-duplex
 ipv6 address 2005:0:104::1/64
 ipv6 address FE80::1 link-local
 ipv6 rip R1Rip enable
!
interface Serial0/1
 no ip address
 ipv6 address 2005:0:102::1/64
 ipv6 address FE80::1 link-local
 ipv6 rip R1Rip enable
 clock rate 64000
!



R2#sh run int s 1/1
Building configuration...

Current configuration : 129 bytes
!
interface Serial1/1
 no ip address
 ipv6 address 2005:0:102::2/64
 ipv6 address FE80::2 link-local
 ipv6 rip R2Rip enable
end



R4#sh run | b Lo
interface Loopback0
 no ip address
 ipv6 address 2000:4:4::/64
 ipv6 rip R4Rip enable
!
interface FastEthernet0/0
 no ip address
 duplex auto
 speed auto
 ipv6 address 2005:0:104::4/64
 ipv6 address FE80::4 link-local
 ipv6 rip R4Rip enable
!