300-415 Question 128
Single answerAn organization is deploying Cisco SD-WAN in a new branch. The underlay network consists of MPLS and internet links. The administrator observes that the branch vEdge router is not able to establish an OMP session with the centralized controllers. Which of the following is the most likely reason for this connectivity issue?
- A
The underlay network does not have proper IP reachability to the centralized controllers.
- B
The branch vEdge router has not been configured with a TLOC extension.
- C
The OMP session is being blocked by the branch firewall.
- D
The branch vEdge router is using an outdated version of the SD-WAN image.
Show answer and explanation
Correct answer: A
Explanation
In Cisco SD-WAN, underlay connectivity is critical for the overlay network to function. OMP relies on the underlay to establish communication between SD-WAN devices and controllers. If there is no IP reachability in the underlay, the OMP session cannot be formed, regardless of other configurations or features like TLOC extensions.
- A. Correct.
OMP sessions rely on the underlay network to establish connectivity with centralized controllers. If there is no proper IP reachability in the underlay, the OMP session cannot be established.
- B. Incorrect.
TLOC extension is used to extend transport links across multiple routers but is not required for OMP session establishment.
- C. Incorrect.
While firewalls can block OMP sessions, this is less likely as OMP uses specific ports, and the question does not mention any firewall misconfigurations.
- D. Incorrect.
An outdated SD-WAN image may cause compatibility issues, but it would not directly cause the lack of OMP session establishment due to IP reachability issues.