Refer to the following exhibit.
You executed the following commands on all three routers in OSPF AS 1:
The ipv6 cef command in the global configuration mode
The interface serial command in the global configuration mode
The ipv6 address command in the interface configuration mode
The ipv6 ospf area command in the interface configuration mode
You run the show ipv6 traffic command and observe that IPv6 packets are not being exchanged between the OSPF routers.
Which of the following commands should be configured on the routers to fix the problem?
- ipv6 enable
- ip address
- ipv6 router ospf
- ipv6 unicast-routing
The ipv6 unicast-routing command should be used on all of the routers to rectify the problem. The ipv6 unicast-routing command allows the forwarding of IPv6 packets. You should execute the ipv6 unicast-routing command in the global configuration mode.
A sample configuration to enable OSPF for IPv6 on the S0/1 interface of rtrA is as follows:
The ipv6 enable command is not required if an IPv6 address has been configured on an interface. If it is executed with no IPv6 addresses configured, the interfaces will use the link local IPv6 addresses that each interface generates automatically.
The ip address command is not required to fix the problem because this command is used to specify an IPv4 address to a router interface. The use of this command depends on the type of tunneling mechanism used. In this case, no tunneling mechanism is being used.
The ipv6 router ospf command does not rectify the problem because this command is used to enter the router configuration mode for OSPF for IPv6. Using this command is optional and does not affect the activation of OSPF for IPv6 on the routers.
Layer 3 Technologies
Configure and verify OSPF for IPv6