Cross-Zone Load Balancing is a feature of the AWS Elastic Load Balancer service that allows the distribution of incoming traffic across instances in multiple Availability Zones (AZs) within a region, rather than just in the same AZ as the load balancer.
It works by distributing the traffic evenly across all registered instances, regardless of which AZ they are located in.
By default, the load balancer distributes incoming traffic only to the instances located in the same AZ as the load balancer.
However, this can lead to uneven distribution of traffic if there are only a few instances in the same AZ as the load balancer or if there is a sudden spike in traffic. Cross-Zone Load Balancing helps to distribute traffic more evenly and improves the overall performance and availability of your applications.
For example, consider a web application that consists of multiple instances running in different AZs within a region.
The load balancer can distribute incoming traffic across all instances, regardless of which AZ they are located in, resulting in a more even distribution of traffic and improved application performance.
To enable Cross-Zone Load Balancing, you simply need to turn on the "Cross-Zone Load Balancing" option in the configuration settings of your Elastic Load Balancer.
Once enabled, the load balancer will distribute incoming traffic across all registered instances, regardless of which AZ they are located in.
Overall, Cross-Zone Load Balancing is an important feature of the Elastic Load Balancer service that helps to improve the performance and availability of your applications by distributing incoming traffic more evenly across all registered instances, regardless of which AZ they are located in.
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