# Amazon Elastic Load Balancing Construct Library
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---
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The `@aws-cdk/aws-elasticloadbalancing` package provides constructs for configuring
classic load balancers.
## Configuring a Load Balancer
Load balancers send traffic to one or more AutoScalingGroups. Create a load
balancer, set up listeners and a health check, and supply the fleet(s) you want
to load balance to in the `targets` property.
```python
# vpc: ec2.IVpc
# my_auto_scaling_group: autoscaling.AutoScalingGroup
lb = elb.LoadBalancer(self, "LB",
vpc=vpc,
internet_facing=True,
health_check=elb.HealthCheck(
port=80
)
)
lb.add_target(my_auto_scaling_group)
lb.add_listener(
external_port=80
)
```
The load balancer allows all connections by default. If you want to change that,
pass the `allowConnectionsFrom` property while setting up the listener:
```python
# my_security_group: ec2.SecurityGroup
# lb: elb.LoadBalancer
lb.add_listener(
external_port=80,
allow_connections_from=[my_security_group]
)
```
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