Weights: Lastly, Azure Front Door will round robin the traffic among the final selected group of origins in the ratio of weights specified.If the origin group's latency sensitivity is set to 30 ms, then the lowest latency pool consists of origins A and B, because D is beyond 30 ms away from the closest origin that is A. Example: Suppose Front Door has measured the latency from the environment where the request arrived to origin A at 15 ms, while the latency for B is 30 ms and D is 60 ms away.This signal is based on the latency sensitivity setting on the origin group, as well as the latency of the closer origins. Latency signal (based on health probe): Select the origins within the allowable latency range from the Front Door environment where the request arrived.Then, the selected origins will be A, B, and D. Example: Suppose origin A, B, and D have priority 1 and origin F has a priority of 2.Priority: The top priority origins among the available ones are selected.The list of available origins is A, B, D, and F. Example: Suppose there are six origins A, B, C, D, E, and F, and among them C is unhealthy and E is disabled.Available origins: Select all origins that are enabled and returned healthy (200 OK) for the health probe.The following diagram shows the overall decision flow: The origin group or backend pool set by the rules engine overrides the routing process described in this article. When you use the Front Door rules engine, you can configure a rule to override route configurations in Azure Front Door Standard and Premium tier or override the backend pool in Azure Front Door (classic) for a request. Session Affinity: You can configure session affinity for your frontend hosts or domains to ensure requests from the same end user gets sent to the same origin. ![]() Traffic gets distributed by the weight value if the latencies of the origins are within the acceptable latency sensitivity range in the origin group. Weighted: A weighted value can be assigned to your origins when you want to distribute traffic across a set of origins evenly or according to the weight coefficients. The secondary origin can be a backup in case the primary origin becomes unavailable. Priority: A priority can be set to your origins when you want to configure a primary origin to service all traffic. In other words, requests get sent to the nearest set of origins in respect to network latency. Latency: The latency-based routing ensures that requests are sent to the lowest latency origins acceptable within a sensitivity range. ![]() ![]() An Origin and a origin group in this article refers to the backend and backend pool of the Azure Front Door (classic) configuration.
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