Refer to the exhibit. Router R1 has recently been configured to operate in an IPv6 only network and is connected via interface Gigabit Ethernet 0/0 to router R2. R2 is configured correctly, but will not form a neighbor relationship with R1 What is the problem?
CCNP Enterprise: Advanced Routing ( Version 8.0) – Routing Concepts and EIGRP Exam
- The IP address is missing on interface Gigabit Ethernet 0/0.
- The router ID has not been created on router R1.
- The EIGRPv6 process has not been activated on interface Gigabit Ethernet 0/0.
- The command ipv6 unicast-routing has not been implemented.
Explanation: To successfully implement EIGRPv6 on a Cisco router, the administrator must provide a router ID within the EIGRPv6 router configuration mode. EIGRPv6 will fail to form a neighbor relationship until the router ID is provided. Being an IPv6 only network indicates that there are no configured IPv4 addresses on the router to provide a router ID. The fact that the command ipv6 eigrp 20 was successfully entered into the R1 configuration indicates that the command ipv6 unicast-routing has been entered (otherwise, the ipv6 eigrp 20 command would be rejected).