To configure OSPF for IPv6, follow these steps:
1. Enable OSPFv3 on the interfaces of the routers that will participate in the network.
2. Configure the router ID for each router.
3. Define the OSPFv3 area IDs and the area types.
4. Advertise the networks that are reachable through the interfaces on the routers.
5. Configure the router priority for each OSPFv3 interface.
6. Define the OSPFv3 authentication type and key if needed.
7. Verify the OSPFv3 configuration using show commands.
Here is an example OSPFv3 configuration:
Router(config)# ipv6 router ospf 1
Router(config-rtr)# router-id 1.1.1.1
Router(config-rtr)# area 0.0.0.1 virtual-link 2.2.2.2
Router(config-rtr)# area 0.0.0.1 range 2001:DB8:1::/48
Router(config-rtr)# interface Ethernet0/0
Router(config-if)# ipv6 ospf network point-to-point
Router(config-if)# ipv6 ospf priority 10
Router(config-if)# ipv6 ospf authentication message-digest
Router(config-if)# ipv6 ospf message-digest-key 1 md5 OSPFV3KEY
These commands enable OSPFv3 on router 1.1.1.1, define the virtual link to router 2.2.2.2, advertise the network 2001:DB8:1::/48 in area 0.0.0.1, configure priority and authentication for the Ethernet0/0 interface. The last two commands define the OSPFv3 authentication key.
