Your on-prem and Google Cloud use Cloud Router with BGP. You enable BFD for the BGP session. What is the primary effect of enabling BFD on that session?
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Correct answer: Detect link or path failures faster so BGP can converge more quickly..
Why this is the answer
Enabling Bidirectional Forwarding Detection (BFD) significantly accelerates the detection of link or path failures in a BGP session. BFD sends rapid, lightweight packets between BGP peers. If these packets are not received within a configured interval, BFD quickly declares the peer down, allowing BGP to converge much faster than relying solely on BGP's default hold timers. This rapid detection minimizes downtime and ensures traffic is rerouted promptly. BFD does not replace BGP route advertisements, encrypt sessions, or increase hold timers; its sole purpose in this context is fast failure detection.
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