|Using Elastic Load Balancing / Eucalyptus Load Balancing Usage Examples|
When an ELB has instances in multiple available zones, enabling cross-zone load balancing will distribute traffics to instances across availability zones. If disabled, the load balancer in a zone will distribute traffics to instances within the zone. For example, if a Zone A has 10 instances, and a Zone B has 1 instance, and the client happens to use the load balancer of Zone B (via round-robin DNS), cross-zone load balancing will ensure that the clients will use all 11 instances, not just the one instance in Zone B.
To enable cross-zone load balancing:
eulb-describe-lb-attributes myloadbalancer AccessLog.Enabled false ConnectionDraining.Enabled false ConnectionSettings.IdleTimeout 60 CrossZoneLoadBalancing.Enabled true