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where is a azure loadbalancer's zone?

Anonymous
2025-02-14T17:09:57.7066667+00:00

Hi Teams!

I'd like to ask something about azure loadbalancer.

When creating a public load balancer, no zones are selected separately.

But in reality, load balancers will be deployed to physical data centers.

which zone will it be deployed?

Azure Load Balancer
Azure Load Balancer

An Azure service that delivers high availability and network performance to applications.

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Andreas Baumgarten 132K Reputation points MVP Volunteer Moderator
2025-02-14T17:42:34.0633333+00:00

Hi @jenny ,

the zones of a public load balancers are related to the zone configuration of the public IPs.

The load balancer's availability zone selection is synonymous with its frontend IP's zone selection. For public load balancers, if the public IP in the Load balancer's frontend is zone redundant then the load balancer is also zone-redundant. If the public IP in the load balancer's frontend is zonal, then the load balancer will also be designated to the same zone.

Source: Availability zone support

(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards

Andreas Baumgarten

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  1. Andreas Baumgarten 132K Reputation points MVP Volunteer Moderator
    2025-02-15T15:49:00.84+00:00

    Hi @jenny ,

    please let me know why load balancer(zone1) can connect to vm(zone2).

    The connection of load balancer (Zone 1) and the VM (Zone 2) is via Backend Pool configuration and is using the private IP of the VM.

    The configuration should look like this:Diagram of resources deployed for a standard load balancer implement.

    Source: https://learn.microsoft.com/en-us/azure/load-balancer/quickstart-load-balancer-standard-public-portal

    A Virtual Network spans all availability zones in a region. That is the "trick" why the Load Balancer in Zone 1 and the VM in Zone 2 are able to connect/communicate.

    Source: Virtual networks and availability zones

    (If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

    Regards

    Andreas Baumgarten

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