R3(config)#<input>ipv6 unicast-routing</input>
R3(config)#<input>ipv6 cef</input>

R3(config)#<input>int fa0/0</input>
R3(config-if)#<input>ipv6 enable</input>
R3(config-if)#<input>ipv6 address 2001:16D8:DD85:139::7/64</input>
R3(config-if)#<input>exit</input>
R3(config)#<input>int fa0/1</input>
R3(config-if)#<input>ipv6 enable</input>
R3(config-if)#<input>ipv6 address 2001:16D8:DD85:140::1/64</input>
R3(config-if)#<input>ipv6 dhcp relay destination 2001:16D8:DD85:4::166</input>

R3#<input>show ipv6 int fa0/0</input>
FastEthernet0/0 is up, line protocol is up
  IPv6 is enabled, link-local address is FE80::128C:CFFF:FE2E:916E
  No Virtual link-local address(es):
  Global unicast address(es):
    2001:16D8:DD85:139::7, subnet is 2001:16D8:DD85:139::/64
  Joined group address(es):
    FF02::1
    FF02::2
    FF02::1:FF00:7
    FF02::1:FF2E:916E
  MTU is 1500 bytes
  ICMP error messages limited to one every 100 milliseconds
  ICMP redirects are enabled
  ICMP unreachables are sent
  ND DAD is enabled, number of DAD attempts: 1
  ND reachable time is 30000 milliseconds (using 30000)
  ND advertised reachable time is 0 (unspecified)
  ND advertised retransmit interval is 0 (unspecified)
  ND router advertisements are sent every 200 seconds
  ND router advertisements live for 1800 seconds
  ND advertised default router preference is Medium
  Hosts use stateless autoconfig for addresses.

R3(config)#<input>ipv6 route 2000::/3 2001:16D8:DD85:139::1</input>

R3#<input>show ipv6 route</input>
IPv6 Routing Table - default - 7 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
       B - BGP, HA - Home Agent, MR - Mobile Router, R - RIP
       I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
       D - EIGRP, EX - EIGRP external, NM - NEMO, ND - Neighbor Discovery
       l - LISP
       O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
S   2000::/3 [1/0]
     via 2001:16D8:DD85:139::1
C   2001:16D8:DD85:139::/64 [0/0]
     via FastEthernet0/0, directly connected
L   2001:16D8:DD85:139::7/128 [0/0]
     via FastEthernet0/0, receive
C   2001:16D8:DD85:140::/64 [0/0]
     via FastEthernet0/1, directly connected
L   2001:16D8:DD85:140::1/128 [0/0]
     via FastEthernet0/1, receive
L   FF00::/8 [0/0]
     via Null0, receive

ping 2001:200:dff:fff1:216:3eff:feb1:44d7

R1#<intput>ping www.v6.facebook.com</inpu>
Translating "www.v6.facebook.com"...domain server (172.16.4.66) [OK]

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2620:0:1CFE:<notice>FACE:B00C</notice>::3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 164/168/176 ms

ipv6 router rip RIPNGR3
!
int fastethernet0/1
 ipv6 address 2001:410:ffff:1::1/64
 ipv6 rip RIPNGR3 enable 
 ipv6 rip default-information originate 
!
int fastethernet0/0 
 ipv6 address 2001:410:ffff:2::1/64
 ipv6 rip RIPNGR3 enable 
 ipv6 rip default-information originate 
!
ipv6 route ::/0 ethernet0