For a high availability cluster, which action is most effective in minimizing impact from a single link failure?

The most effective action for minimizing impact from a single link failure in a high availability (HA) cluster is to set up a full-mesh design that utilizes redundant interfaces. In a full-mesh configuration, each unit in the cluster is connected to all other units, creating multiple pathways for data to travel. This design significantly enhances redundancy and fault tolerance. If one link fails, the traffic can be rerouted through alternative paths without disrupting overall service availability.

This configuration improves resilience because it reduces the likelihood of a single point of failure affecting the entire cluster. Redundant interfaces ensure that there are backup connections available for all critical communications, hence maintaining a robust network infrastructure.

While increasing the number of FortiGate units or enabling monitoring of interfaces contributes to the overall system reliability, they do not directly address the issue of a single link failure as effectively as a full-mesh design. Similarly, configuring HA to use a ping server feature is beneficial for detecting failures but does not specifically provide the same redundancy and immediate failover capabilities that a full-mesh setup does.