1. Enable IPV6:
R4(config)# ipv6 unicast-routing
2. Supply interface fa0/0 with an IPV6 address:
R4(config-if)# ipv address 2001:0:0:1::/64 eui-64
3. Configure an IPV6 OSPF routing process 110:
R4(config)# ipv6 router ospf 110 Here manually supply a router id: (optional if ipv4 addresses are present) R4(config-rtr)# router-id 126.96.36.199 4. Enable IPV6 OSPF on the IF fa0/0: R4(config-if)# ipv6 ospf 110 area 0 R4(config-if)# do sh ipv6 protocols IPv6 Routing Protocol is "connected" IPv6 Routing Protocol is "static" IPv6 Routing Protocol is "ospf 110" Interfaces (Area 0): FastEthernet0/0
Perform the tasks above on the adjacent router as well and check whether an OSPF adjacency is formed.
R4(config-if)# do sh ipv6 ospf neighbor
Neighbor ID Pri State Dead Time Interface ID Interface
188.8.131.52 1 FULL/BDR 00:00:36 4 FastEthernet0/0
5. Add a fictional IPV6 network on a loopback interface:
R4(config-if)# int lo0
R4(config-if)# ipv6 address 2001:0:0:2::/64 eui-64
Enable OSPF-6 on this interface:
R4(config-if)# ipv6 ospf 110 area 0
Perform these tasks on the adjacent router as well with a different IPV6 network on the loopback interface, eg 2001:0:0:3::/64.
Check the IPV6 addresses on the NIC’s:
R4# sh ipv6 int brief
FastEthernet0/1 [administratively down/down]
Check the OSPF-6 route distribution:
R4# sh ipv6 route
O 2001::3:C603:40FF:FEA2:0/128 [110/10]
via FE80::C603:40FF:FEA2:0, FastEthernet0/0
Notice the /128: this is the route to 1 IP address, since OSPF recognizes the nature of the loopback address. (1 address, not a whole network)
6. Test the route
Hint : at this stage, to see the adjacent IPV6 address, “show cdp neighbours detail” is your friend in identifiying those tiresome IPV6 addresses.
R4# traceroute 2001::3:C603:40FF:FA2:0
Type escape sequence to abort.
Tracing the route to 2001::3:C603:40FF:FEA2:0
1 2001::3:C603:40FF:FEA2:0 16 msec 20 msec 24 msec
Configuring OSPF MD5 Authentication
R4(config-if)#ipv6 ospf authentication ipsec spi 256 md5 0 1234567890ABCDEF1234567890ABCDEF → at this stage the OSPF neighbour relation is temporarily lost as long as the authentication has not been setup on both adjacent routers. → 32 characters are needed here for MD5 Configure this on the adjacent router as well. The adjacency relationship should be restore and all is jolly.