300-415 Question 31
Single answerAn enterprise has deployed Cisco SD-WAN and configured multiple WAN Edge devices across branch locations. During troubleshooting, you discover that a specific WAN Edge device is unable to forward traffic to a remote site. Upon inspection, you notice that the TLOCs on this WAN Edge are in a 'DOWN' state. What could be the most likely cause for this issue?
- A
The WAN Edge device has lost its control connection to the vSmart controller.
- B
The OMP session between the WAN Edge and the vSmart controller is inactive.
- C
The physical underlay link used by the TLOC is down or misconfigured.
- D
The WAN Edge device has been removed from the vManage configuration template.
Show answer and explanation
Correct answer: C
Explanation
TLOCs (Transport Locators) in Cisco SD-WAN represent the physical underlay connections or transport circuits that a WAN Edge device uses to forward traffic. When a TLOC is in the 'DOWN' state, it typically indicates an issue with the physical underlay link, such as it being down, disconnected, or misconfigured. This directly impacts the data plane functionality, preventing the device from forwarding traffic to remote sites.
- A. Incorrect.
If the WAN Edge device loses its control connection to the vSmart controller, it may stop receiving control plane updates, but this would not directly cause TLOCs to be in a 'DOWN' state. TLOC status is dependent on the data plane and physical underlay.
- B. Incorrect.
An inactive OMP session impacts route advertisement and overlay communication but does not directly cause the TLOC to be marked as 'DOWN'.
- C. Correct.
TLOCs represent the transport locations of the WAN Edge device and are directly tied to the physical underlay links. A physical link failure or misconfiguration would cause the TLOC to be in a 'DOWN' state.
- D. Incorrect.
Removing the WAN Edge device from a vManage configuration template may cause configuration inconsistencies or errors, but it would not directly cause the TLOCs to be marked as 'DOWN'.