ipv6 love...

slap it around... nice and simple...

r1

ipv6 unicast-rout
ipv6 cef

int lo0
ipv6 add 2001:1111::1/64

int s1/0
ipv6 add 2001::1/64
clock rate 128000
no shut

r2

ipv6 unicast-rout
ipv6 cef

int lo0
ipv6 add 2002:2222::1/64

int s1/0
ipv6 add 2001::2/64
no shut

int f0/0
ipv6 add 2002::1/64
no shut


r3

ipv6 unicast-rout
ipv6 cef

int lo0
ipv6 add 2003:3333::1/64

int f0/0
ipv6 add 2002::2/64
no shut

int f0/1
ipv6 add 2003::1/64
no shut

r4

int lo0
ipv6 add 2004:4444::1/64

int f0/1
ipv6 add 2003::2/64
no shut

first get comfortable with connectivity...

r1#ping ipv6 2001::2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001::2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/6/20 ms
 

r2#ping ipv6 2002::2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2002::2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/8/28 ms
 

r3#ping ipv6 2003::2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2003::2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/10/28 ms