Load balancing involves three types of bandwidth: Backend ECS bandwidth 、 Load balancing instance bandwidth as well as Load balancing listening bandwidth 。

Among them, the data transmission and health check between the load balancing instance and the back-end ECS are performed by Intranet Conducted.

• Backend ECS bandwidth: It is the public network bandwidth purchased when purchasing ECS. This bandwidth is the channel size of ECS when communicating with the Internet. Do not participate in the load balancing scheduling process;
• Load balancing instance bandwidth: It is the public network bandwidth purchased when purchasing load balancing. The bandwidth is the channel size of the load balancing instance when communicating with the Internet. Like ECS, it is regarded as an Internet entity, participates in the load balancing scheduling process, and is the entrance of load balancing requests.
• Load balancing listening bandwidth: The intranet bandwidth when configuring load balancing monitoring is the size of the communication channel between the load balancing instance and the back-end ECS. This bandwidth uses intranet communication to ensure data security. If a load balancing instance contains multiple listeners, the total bandwidth of these listeners is less than or equal to Load balancing instance bandwidth 。