Archtecture question

Question

Team,

I want some advice. I need to put geo based filtering. If request comes via A region it should call A region Function App. If request comes from B region it should call B region Function App. But for the consumer there should be only 1 link and this geo based filtering should be handled internally.

I was thinking to use Front Door. Am I right? and if yes, how can I achieve this result? Or is there any other service which I can chose?

Answer 1

Hi @Sangam Wadhwa

Azure front door latency based routing ensures that requests are sent to the lowest latency backends acceptable within a sensitivity range. Basically, your user requests are sent to the "closest" set of backends in respect to network latency. So if request comes via A region as the latency is less to the A region Function App, the request will be routed to A region Function App.

The 'closest' backend isn't necessarily closest as measured by geographic distance. Instead, Front Door determines the closest backends by measuring network latency. Ex: If the user from A region requests but during that time the latency to the A location is high than B location, then the request will be routed to Location B as the latency is less.

Ref: https://learn.microsoft.com/en-us/azure/frontdoor/front-door-routing-methods.

Configuration : By default you see latency based routing , if you want other routing methods to enable then under backend pool you will find priority and weight options.

Ref: https://learn.microsoft.com/en-gb/azure/frontdoor/front-door-backend-pool

If you want only Geo based filtering irrespective of the latency then you need to go with Traffic manager service, Geographic as routing method.

Ref: https://learn.microsoft.com/en-us/azure/traffic-manager/traffic-manager-routing-methods

Loadbalancing Ref : https://learn.microsoft.com/en-us/azure/architecture/guide/technology-choices/load-balancing-overview

Hope this was helpful. Please let us know in case of any additional questions or concerns.

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