What is the problem?

Refer to the exhibit.

Refer to the exhibits. An engineer troubleshoots a Cisco SD-WAN connectivity issue between an on-premises data center WAN Edge and a public cloud provider WAN Edge. The engineer discovers that BFD is Dapping on vEdge1.

What is the problem?
A . The remote Edge device BFD is down.
B . The remote Edge device failed to respond BFD keepalives.
C . The remote Edge device has a duplicate IP address.
D . The control plane deleted the BFD session.

View Answer

Answer: D

Explanation:

The provided exhibit shows log entries from a Cisco SD-WAN device and a network diagram. The logs indicate a problem with Bidirectional Forwarding Detection (BFD) on vEdge1.

Without the actual logs or further context, pinpointing the exact issue is challenging. However, typically BFD flapping (going up and down) is due to issues with either the BFD configuration, link instability, or a problem with the remote endpoint (such as the remote BFD daemon being down or unresponsive). If the control plane deleted the BFD session, it could be due to policy changes, or if the session is marked as "deleted", it could imply that the control plane intended to remove the session, which aligns with option D.