Server Load Balancer (SLB) distributes network traffic across groups of backend servers to improve the service capability and application availability. It provides functions as a reverse proxy at Layer 7（ALB）and load balancing services at Layer 4 （CLB）.
High Performance and Elasticity Stable, Reliable, and Globally Available
Server Load Balancer (SLB) provides high-performance load balancing services. Classic Load Balancer (CLB) runs at Layer 4 and supports up to 100,000 QPS. The newly released Application Load Balancer (ALB) service is based on Alibaba Cloud Apsara Network 2.0 and supports up to 1,000,000 QPS.
The Server Load Balancer (SLB) instances feature high performance and support auto scaling. They can automatically adjust resources based on your business requirements to simplify O&M.