Answer-first summary for fast verification
Answer: Ask the on-premises team to enable Bidirectional Forwarding Detection (BFD).
The BGP session flaps are likely due to intermittent connectivity issues causing the BGP hold timer to expire. Enabling Bidirectional Forwarding Detection (BFD) (Option D) is the correct solution because BFD provides faster failure detection than BGP's default timers, reducing session instability. Google Cloud supports BFD for Cloud Router, and it is recommended to enable it for quicker convergence. Static routing (A) is not dynamic and impractical for most environments. Increasing the hold timer (B) is ineffective as Google Cloud caps the maximum BGP hold time at 120 seconds. Graceful restart (C) helps during router restarts but does not address the root cause of session flaps due to connectivity issues.
Author: LeetQuiz Editorial Team
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To troubleshoot frequent BGP session flaps between your on-premises network and Google Cloud, how should you review and verify the BGP configuration?
A
Switch to static routing.
B
Increase the BGP hold timer to 36000 seconds max.
C
Ensure that graceful restart is enabled on the on-premises router.
D
Ask the on-premises team to enable Bidirectional Forwarding Detection (BFD).
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