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What strategies improve failover performance in dual-ISP BGP setups?

Asked on Oct 22, 2025

Answer

In dual-ISP BGP setups, improving failover performance involves optimizing route selection, reducing convergence time, and ensuring redundancy. Key strategies include tuning BGP timers, using BGP attributes for path preference, and implementing diverse physical paths.

Example Concept: In a dual-ISP BGP setup, failover performance can be enhanced by adjusting BGP timers such as the keepalive and hold timers to detect failures more quickly. Additionally, configuring BGP attributes like Local Preference and AS Path Prepending can influence outbound and inbound traffic paths, respectively. Implementing route dampening can prevent flapping routes from causing instability, while using diverse physical paths and redundant hardware ensures that a single point of failure does not impact connectivity.

Additional Comment:

Consider using BFD (Bidirectional Forwarding Detection) for faster link failure detection.
Ensure that both ISPs provide diverse routing paths to avoid common points of failure.
Regularly test failover scenarios to validate configurations and response times.
Monitor BGP sessions and network performance using tools like SNMP or NetFlow.

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What strategies improve failover performance in dual-ISP BGP setups?

Asked on Oct 22, 2025

Answer

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