Implementing Cisco IP Routing (CCNP ROUTE, legacy) — Question 275

Router A and Router B are configured with IPv6 addressing and basic routing capabilities using OSPFv3. The networks that are advertised from Router A do not show up in Router B's routing table. After debugging IPv6 packets, the message "not a router" is found in the output. Why is the routing information not being learned by Router B?

Answer options

• A. OSPFv3 timers were adjusted for fast convergence.
• B. The networks were not advertised properly under the OSPFv3 process.
• C. An IPv6 traffic filter is blocking the networks from being learned via the Router B interface that is connected to Router A.

Correct answer: A

Explanation

The correct answer is A, as adjusting OSPFv3 timers can impact convergence and the ability to learn routes. Option B implies a configuration issue, which does not directly relate to the 'not a router' message, suggesting the networks may have been advertised. Option C suggests a filtering issue, but the debug message indicates Router B is not recognizing Router A as a router, which is more aligned with OSPFv3 timer settings.