You manage the EIGRP subnet in your organization. You have enabled EIGRP for IPv6 on all the routers in the
EIGRP AS 260 using the following commands on all the routers:

During verification, you discover that EIGRP for IPv6 is not running on the routers.Which of the following should be done to fix the issue?

A.
The ipv6 address command should be executed in interface configuration mode.

B.
The ipv6 address command should be executed in router configuration mode.

C.
The eigrp router-id command should be executed in interface configuration mode.

D.
The eigrp router-id command should be executed in router configuration mode.

Explanation:
The eigrp router-id command should be executed in router configuration mode to fix the issue. This command
specifies a fixed router IPv4 address to the router. If this command is missing or incorrectly configured on the
router, EIGRP for IPv6 will not run properly.
Another command that you should perform so that EIGRP for IPv6 runs on the routers is the no shutdown
command. You should execute this command in interface configuration mode. The no shutdown command is
necessary because all the interfaces with EIGRP for IPv6 enabled on them are in a shutdown state by default.
A sample configuration to implement EIGRP for IPv6 on a router is as follows:

The two options stating that the ipv6 address command should be executed on the routers are incorrect.
EIGRP for IPv6 can be configured on router interfaces without explicitly specifying a global unicast IPv6
address. If you specify the ipv6 enable command, as in this scenario, then the IPv6 address command is not
required.
The option stating that the eigrp router-id command should be executed in interface configuration mode is
incorrect. This command should be executed in router configuration mode instead of interface or global
configuration modes.
Objective:
Routing Fundamentals
Sub-Objective:
Configure, verify, and troubleshoot EIGRP for IPv6 (excluding authentication, filtering, manual summarization,
redistribution, stub)

Cisco IPv6 Implementation Guide, Release 15.2M&T > Implementing EIGRP for IPv6 > How to Implement
EIGRP for IPv6 > Enabling EIGRP for IPv6 on an Interface