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AWS SAA

082 Cross Zone Load Balancing

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What it does

with cross

If cross-zone load balancing is enabled, each of the 10 targets receives 10% of the traffic. This is because each load balancer node can route its 50% of the client traffic to all 10 targets.

without cross

If cross-zone load balancing is disabled:

  • Each of the two targets in Availability Zone A receives 25% of the traffic.
  • Each of the eight targets in Availability Zone B receives 6.25% of the traffic.

This is because each load balancer node can route its 50% of the client traffic only to targets in its Availability Zone.

How to use

Application Load Balancer

  • With Application Load Balancers, cross-zone load balancing is always enabled at the load balancer level.
  • At the target group level, cross-zone load balancing can be disabled.
  • No charges

Network/Gateway Load Balancer

  • Disabled by default
  • pay charges for inter AZ data