Which Forwarding Modes Does ELB Support?

ELB supports the following forwarding modes:

  • Round robin: sends requests to backend ECSs in polling mode. This forwarding rule applies to short-connection services, such as the HTTP service.

  • Least connections: preferentially sends requests to the backend ECS with the least connections. This forwarding rule applies to long-connection services, such as the database service.

  • Source IP address: calculates the hash value of the request source IP address and sends requests to a matched ECS. This forwarding rule ensures that requests initiated from the same source IP addresses are sent to a fixed ECS. This rule applies to TCP connections of load balancers that do not use cookies.

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