350-501 · Question #46
The network operation center is receiving an excessive number of BFD alerts. This is due to recently configured high-speed links that result in BGP session teardown. Engineers tried to modify the…
The correct answer is A. enable the BFD Dampening feature. To mitigate excessive BFD alerts on high-speed links causing BGP session teardowns when timer adjustments fail, enabling BFD Dampening maximizes network stability.
Question
The network operation center is receiving an excessive number of BFD alerts. This is due to recently configured high-speed links that result in BGP session teardown. Engineers tried to modify the BFD timers, but no improvement was noticed. Which action maximizes network stability?
Options
- Aenable the BFD Dampening feature
- Bfully remove the BFD configuration
- Cmodify the IGP hello timers
- Denable the BGP Dampening feature
How the community answered
(42 responses)- A71% (30)
- B14% (6)
- C10% (4)
- D5% (2)
Why each option
To mitigate excessive BFD alerts on high-speed links causing BGP session teardowns when timer adjustments fail, enabling BFD Dampening maximizes network stability.
BFD Dampening is a feature specifically designed to suppress excessive BFD session flap notifications, preventing rapid client protocol (like BGP) session resets that result from intermittent BFD instability without completely disabling fast failure detection.
Fully removing BFD would eliminate fast failure detection, leading to slower convergence and potential traffic black-holing during real failures, which does not maximize network stability.
Modifying IGP hello timers impacts IGP neighbor relationships and convergence, but does not directly address BFD session instability or prevent BFD-triggered BGP teardowns.
BGP Dampening addresses the flapping of BGP *routes* in the routing table, not the underlying stability of BFD sessions or BGP peer sessions themselves.
Concept tested: BFD Dampening for stability
Source: https://www.cisco.com/c/en/us/td/docs/ios/ipapp/configuration/guide/ipapp_c-bfd-damp.html
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