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?
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.
D.
IPv6 unicast routing is not enabled on Router A or Router B.
The ipv6 unicast-routing command globally enables IPv6 and must be the first IPv6 command executed on the router.
Router(config)# ipv6 unicast-routing
By default, IPv6 traffic forwarding is disabled, so using this command enables it. Also, as you’ve probably guessed, IPv6 isn’t enabled by default on any interfaces either, so we have to go to each interface individually and enable it.
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