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How does BGP handle route flapping in large networks?
Asked on Feb 14, 2026
Answer
BGP handles route flapping in large networks using a mechanism called route dampening, which suppresses unstable routes to prevent excessive updates and maintain network stability. This is crucial in environments where frequent route changes can lead to increased CPU load and network instability.
Example Concept: BGP route dampening assigns a penalty to routes that flap, or change state frequently. When the penalty exceeds a configured threshold, the route is suppressed and not advertised until the penalty decays below the threshold. This decay occurs over time, allowing stable routes to be re-advertised, while persistently unstable routes remain suppressed. This mechanism helps reduce unnecessary BGP updates and stabilizes the routing table in large-scale networks.
Additional Comment:
- Route dampening is configured using parameters such as "half-life," "reuse," and "suppress" thresholds.
- Careful tuning of these parameters is necessary to avoid suppressing legitimate route changes.
- Not all networks enable route dampening due to potential impacts on convergence times.
- Monitoring tools can help visualize the impact of route dampening on network stability.
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