- Out of all available EC2 instances, those instances are marked that would be behind the Classic Load Balancer.
- It is a good practice to pick EC2 instances from all AZs to attain max. fault tolerance
- Cross-Zone Load Balancing (disabled by default for a Classic Load Balancer) -
- If enabled, traffic distributed evenly across all registered instances (no matter which AZ they are in) i.e if 2 AZs have N1 and N2 instances respectively, entire traffic is distributed amongst N1+N2 instances evenly.
- If disabled, traffic distributed evenly across all enabled Availability Zones i.e. 2 AZs enabled that that N1 and N2 number of instances respectively, both AZs get the same amount of traffic served be N1 and N2 number of instances respectively.
- Connection Draining - When enabled, prevents Auto Scaling from terminating the instance for a certain specified period of time.
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