300-410 Question 47
Single answerA network engineer is troubleshooting an EIGRP issue in a multi-VRF environment. The EIGRP process in the VRF 'CUSTOMER_A' is not forming a neighbor relationship with a directly connected router. Upon reviewing the configuration and logs, the engineer notices that the EIGRP process in the VRF is not advertising the correct IP address. What is the most likely cause of the issue?
- A
The EIGRP process is not activated under the VRF 'CUSTOMER_A'.
- B
The interface assigned to the VRF 'CUSTOMER_A' is not included in the EIGRP network statement.
- C
The EIGRP process is using the wrong authentication method.
- D
The EIGRP autonomous system number is mismatched between the routers.
Show answer and explanation
Correct answer: B
Explanation
In a multi-VRF environment, each VRF requires its own EIGRP configuration. If an interface assigned to a VRF is not included in the EIGRP network statement, EIGRP will not advertise the interface's IP address, nor will it initiate a neighbor adjacency on that interface. This is a common oversight when configuring EIGRP with VRFs. By including the correct interface in the EIGRP network statement, the neighbor relationship can be established, and the correct IP will be advertised.
- A. Incorrect.
If the EIGRP process is not activated under the VRF, the configuration would not work at all, and the logs would show no activity for EIGRP in the VRF. However, the question specifies that the process is running but not advertising the correct IP.
- B. Correct.
If the interface assigned to the VRF 'CUSTOMER_A' is not included in the EIGRP network statement, the EIGRP process will not advertise the interface's IP address or attempt to form a neighbor relationship. This is the most likely cause of the issue.
- C. Incorrect.
Incorrect authentication would result in an EIGRP neighbor adjacency attempt being rejected, but the question does not mention any authentication-related errors or logs.
- D. Incorrect.
An autonomous system number mismatch would prevent EIGRP from forming a neighbor relationship, but this issue would be evident in the logs. The question focuses on the advertisement of the correct IP address and does not mention AS mismatch.