Problem:

How to configure IPv6 OSPF routing in Cisco IOS



Solution:


This is really simple, first configure the IPv6 addresses on the interfaces.

Router1
Router1(config)# interface fastethernet 0/0
Router1(config-if)#ipv6 address 2001:1ad8::1/126

Router2
Router2(config)#int fa 0/0
Router2(config-if)#ipv6 address 2001:1ad8::2/126

Verify the IPv6 connectivity with ping:
Router2#ping ipv6 2001:1ad8::1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001:1AD8::1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/10/20 ms

Set a nullroute to redistribute to IPv6 OSPF, and configure IPv6 OSPF routing on Router1:
Router1(config)#ipv6 route 2001:1ad8:500::/64 null 0
Router1(config)# interface fa 0/0
Router1(config-if)#ipv6 ospf 1 area 0
Router1(config-if)#ipv6 router ospf 1
Router1(config-rtr)#redistribute static

Do the same thing on Router2, except for the static route and redistribution.
Router2(config)#int fastethernet 0/0
Router2(config-if)#ipv6 ospf 1 area 0

Now verify the IPv6 OSPF router neighborship
Router2#show ipv6 ospf neighbor
Neighbor ID     Pri   State           Dead Time   Interface ID    Interface
172.16.1.1        1   FULL/BDR        00:00:31    4               FastEthernet0/0

Check for the route
Router2#sh ipv6 route ospf  | include ^O
OE2  2001:1AD8:500::/64 [110/20]