Cross Zone Load Balancing

• The nodes for your load balancer distribute requests from clients to registered targets.

• When cross-zone load balancing is enabled, each load balancer node distributes traffic across the registered targets in all enabled Availability Zones.

• When cross-zone load balancing is disabled, each load balancer node distributes traffic only across the registered targets in its Availability Zone.

• With CLBs and ALBs, cross-zone load balancing is enabled by default and for ALBs, it cannot be turned off and there are no charges for inter-AZ data transfer.

• With NLBs, cross-zone load balancing is disabled by default. After you create the load balancer, you can enable or disable cross-zone load balancing at any time.