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Remediation

Enable Cross-Zone Load Balancing​

From Command Line​

For Network and Gateway Load Balancers​

Enable cross-zone load balancing by updating the load balancer attributes:

aws elbv2 modify-load-balancer-attributes \
    --load-balancer-arn {{load-balancer-arn}} \
    --attributes "Key=load_balancing.cross_zone.enabled,Value=true"

For Classic Load Balancers​

aws elb modify-load-balancer-attributes \
    --load-balancer-name {{load-balancer-name}} \
    --load-balancer-attributes "{\"CrossZoneLoadBalancing\":{\"Enabled\":true}}"

For Application Load Balancers​

Since cross-zone load balancing is always enabled at the load balancer level, enable it for associated target groups instead:

aws elbv2 modify-target-group-attributes \
    --target-group-arn {{target-group-arn}} \
    --attributes "Key=load_balancing.cross_zone.enabled,Value=true"