What is the best sync method in the ClusterXL deployment?

Using 1 cluster with the 1st sync interface does not represent a best-practice recommendation and conflates cluster topology count with interface selection without specifying a dedicated path.

Using a single dedicated synchronization interface is the best practice for ClusterXL deployments because it isolates state synchronization traffic from production network traffic, preventing bandwidth contention and packet loss. A dedicated interface ensures that connection table updates between cluster members are not delayed by competing data flows, which is critical for maintaining session consistency and seamless failover.

A three-cluster topology with three sync interfaces introduces unnecessary complexity far beyond the recommended deployment model and is not a standard ClusterXL best practice.

Using two sync interfaces across two clusters adds redundancy at the cost of configuration complexity and is not considered the optimal best-practice compared to a single dedicated sync interface.