You can configure a weighted Round Robin algorithm from within a Load Balancer's Backend Group. This can be done either when you first create the Backend Group or by editing it later.
Here are the steps:
1. Select the Algorithm
Choose the "Round Robin" algorithm.
In fact, all available algorithms support member weighting; they just differ in the logic used to prioritize members.
2. Set the Weight for Each Member
Assign a Weight to each member. Members with a higher weight will receive a proportionally larger share of the traffic.
That's all you need to do to use Weighted Round Robin.