HPE Aruba Certified Professional (ACP) – SD-WAN — Question 20

You have configured BFD for OSPF on a CX switch and have noticed the BFD session stays down but the OSPF neighbor state is up. What could explain this behavior?

Answer options

• A. The remote switch does not support BFD.
• B. BFD is not supported on OSPF broadcast links, so OSPF ignores the config.
• C. BFD has not been enabled at the global configuration level.
• D. The local switch uses OSPFv3, but the remote switch uses OSPFv2.

Correct answer: A

Explanation

The correct answer is A because if the remote switch does not support BFD, the session cannot establish regardless of the OSPF neighbor state. Option B is incorrect as BFD can be supported on broadcast links, option C is wrong because the global configuration is not the issue here, and option D is irrelevant since the OSPF neighbor state being up indicates a compatible OSPF version is used.