Which prerequisite is required on BFD endpoints for BFD operation?
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Correct answer: Cisco Express Forwarding must be enabled on all participating BFD endpoints..
Why this is the answer
Cisco Express Forwarding (CEF) is a prerequisite for BFD operation because BFD relies on CEF to quickly forward BFD control packets. CEF provides optimized, topology-based forwarding, which is essential for BFD's rapid failure detection capabilities. Without CEF, BFD cannot achieve its intended speed and efficiency. Jumbo frame support is not a BFD requirement; BFD packets are small. Not all routers in the path need BFD enabled, only the direct endpoints. The timers 3 9 command is for BGP keepalives and hold timers, not a BFD prerequisite; BFD operates independently of BGP timers.
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