This section discusses the concepts and implementation of OSPFv3 in somewhat detail due to greater emphasis on IPv6 in CCNA version 2 exams.
The following steps are involved in the OSPFv3 configuration on a Cisco router:
Enable IPv6 routing using the ipv6 unicast-routing command from global configuration mode.
Create an OSPFv3 routing process and enter OSPFv3 configuration mode using the ipv6 router ospf process-id from global configuration mode.
Make sure that the router obtains an OSPFv3 router ID through one of available mechanisms for this.
Enable OSPFv3 on interfaces using the ipv6 ospf process-id area area-number command in interface configuration mode, thus also setting the OSPFv3 area for the interface.
In addition to the four steps, you may also configure one or more OSPFv3 interfaces as passive using the passive-interface interface-type interface-number command in router configuration mode.
The OSPFv3 coverage in the new CCNA version 2 exams is mostly limited to single-area scenarios. However, you may also encounter multi-area scenarios occasionally. That’s why we will also briefly cover multi-area concepts and configuration. If you understand single area concepts and configuration well, you will usually find it easy to understand multi-area details.
OSPFv3 Single-Area Configuration
We will present complete IPv6 configuration, including addressing and OSPFv3, on three routers in a single-area OSPFv3 domain, as shown in Figure 13-6.
Figure 13-6 OSPFv3 Single-Area Domain