I have created Cross over region Load balancer

Question

I have created Cross over region Load balancer

HASSAN BIN NASIR DAR 351

Hi,

I have created two regional load balancers and a global load balancer. My question is: If one regional load balancer goes down, will the global load balancer redirect the traffic to the other regional load balancer? But, if the global load balancer goes down, will both regional load balancers be affected?

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Answer 1

Ganesh Patapati 5,355 Microsoft External Staff

@HASSAN BIN NASIR DAR

If one regional load balancer goes down, a global load balancer can redirect traffic to another healthy regional load balancer, ensuring continuity of service. However, if the global load balancer itself goes down, it may lead to service disruptions.

If the global load balancer goes down:

Regional load balancers operate independently of the global load balancer. They continue to manage traffic within their respective regions even if the global load balancer encounters an issue.

The global load balancer primarily handles traffic distribution across regions. If it fails, traffic won't be routed to the regional load balancers, but the regional load balancers themselves will remain operational.

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Refer: https://learn.microsoft.com/en-us/azure/load-balancer/cross-region-overview#regional-redundancy

Home region is where the global load balancer or Public IP Address of Global tier is deployed. This region doesn't affect how the traffic is routed. If a home region goes down, traffic flow is unaffected.

Home regions in Azure

Central US
East Asia
East US 2
North Europe
Southeast Asia
UK South
US Gov Virginia
West Europe
West US
China North 2

Refer: https://learn.microsoft.com/en-us/azure/load-balancer/cross-region-overview#home-regions-and-participating-regions

I hope this has been helpful!

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HASSAN BIN NASIR DAR 351 Reputation points

2025-03-17T22:44:02.8+00:00

If global load balancer itself goes down then how regional load balancer will handle the traffic? Because traffic is coming into the global load balancer’s public ip address.
Ganesh Patapati 5,355 Reputation points Microsoft External Staff

2025-03-18T17:35:02.8866667+00:00

HASSAN BIN NASIR DAR

Thanks for the reply!

The global load balancer primarily handles traffic distribution across regions. If it fails, traffic won't be routed to the regional load balancers, However, existing traffic handled by regional load balancers would remain unaffected.

Azure's global and regional load balancers are designed with high availability and redundancy to prevent disruptions. Failures at the global level are rare and mitigated to minimize impact.

I hope this has been helpful!

Please accept an answer if correct. Original posters help the community find answers faster by identifying the correct answer. Here is how.
HASSAN BIN NASIR DAR 351 Reputation points

2025-03-19T08:34:44.12+00:00

We create multiple regional load balancers to ensure high availability. If one regional load balancer goes down, traffic will be routed to another regional load balancer. But, if the global load balancer itself goes down, it means that new traffic will not be routed. This raises the question: what is the benefit of a global load balancer? In both cases, whether we have one regional load balancer or multiple, we will still face downtime.
Ganesh Patapati 5,355 Reputation points Microsoft External Staff

2025-03-19T08:40:42.2666667+00:00

Hi HASSAN BIN NASIR DAR

Thanks for the reply!

I have initiated a private message to connect offline and address your query in detail.
Ganesh Patapati 5,355 Reputation points Microsoft External Staff

2025-03-19T14:08:22.0533333+00:00
Hello HASSAN BIN NASIR DAR

Thanks for the reply!

Global load balancers offer several benefits, particularly for organizations that manage applications or services with a global user base. Here are some key benefits:

Enhanced Performance: By routing user requests to the nearest data center or server, global load balancers reduce latency, ensuring faster response times for users worldwide.

High Availability: They distribute traffic across multiple servers or regions, preventing any single server from becoming a bottleneck. In case of server or region failures, traffic can be redirected to other operational servers, improving reliability.

Disaster Recovery: They offer built-in redundancy by automatically redirecting traffic to backup servers in case of outages or failures, minimizing downtime and service disruption.

Geographical Load Distribution: By directing users to servers closer to their location, they optimize resource usage and reduce network congestion.

Custom Routing Policies: Some global load balancers allow for intelligent traffic routing based on factors like user location, application health, or specific business rules, offering greater control and flexibility.

Cost Efficiency: By balancing traffic and efficiently using available server resources, organizations can optimize infrastructure costs, reducing the need for overprovisioning.

Note: Azure cross-region Load Balancer is backed by a 99.99% availability SLA, failures at the global level are rare and mitigated to minimize impact.

Refer: https://www.youtube.com/watch?v=3awUwUIv950

Refer: https://learn.microsoft.com/en-us/azure/load-balancer/cross-region-overview

If above is unclear and/or you are unsure about something add a comment below.

Please accept an answer if correct. Original posters help the community find answers faster by identifying the correct answer. Here is how.
Ganesh Patapati 5,355 Reputation points Microsoft External Staff

2025-03-20T14:39:02.1133333+00:00

Hello HASSAN BIN NASIR DAR

I hope this has been helpful!

please don’t forget to close the thread by clicking Accept the answer wherever the information provided helps you, as this can be beneficial to other community members.
Ganesh Patapati 5,355 Reputation points Microsoft External Staff

2025-03-21T08:55:41.9233333+00:00

Hello HASSAN BIN NASIR DAR

I hope this has been helpful!

please don’t forget to close the thread by clicking Accept the answer wherever the information provided helps you, as this can be beneficial to other community members.
Ganesh Patapati 5,355 Reputation points Microsoft External Staff

2025-03-21T16:41:04.18+00:00

Hello HASSAN BIN NASIR DAR

If above is unclear and/or you are unsure about something add a comment below.

please don’t forget to close the thread by clicking Accept the answer wherever the information provided helps you, as this can be beneficial to other community members.
HASSAN BIN NASIR DAR 351 Reputation points

2025-03-22T00:27:38.4733333+00:00

Hi Ganesh,

Thank you for the detailed explanation.

I have only one concern. for example my global load balancer is created in Central US. If Central US site goes down then what will happen?
Ganesh Patapati 5,355 Reputation points Microsoft External Staff

2025-03-24T10:10:10.8066667+00:00
Hello HASSAN BIN NASIR DAR

Thanks for the reply!

Your concern is valid! If your global load balancer is located in the Central US and that region experiences an outage, it could disrupt traffic routing and potentially affect access to your services. To avoid such single points of failure, you can implement a more resilient solution. Here's how you can enhance fault tolerance:

Multi-Region Resiliency with Azure Front Door or Traffic Manager.

Azure Front Door (Recommended):

Azure Front Door is a global load balancer that spans multiple regions.

You can configure multiple backend pools across regions (e.g., Central US and another region, such as East US or West Europe).

If the Central US becomes unavailable, Azure Front Door automatically routes requests to the next available backend based on configured routing rules.

Azure Traffic Manager:

Azure Traffic Manager is another option for global traffic distribution.

You can set up profiles with endpoints in multiple regions. If the Central US endpoint is unresponsive, Traffic Manager routes requests to the next healthy endpoint.

This requires having duplicate instances of your services in other regions.

Active-Active Deployment:

Deploy multiple instances of your backend (e.g., Business Central or Azure Application Gateway) in different Azure regions.

Use either Azure Front Door or Traffic Manager to distribute traffic and ensure redundancy.

If you're sticking with Azure Application Gateway, you can deploy separate gateways in other regions. use DNS failover mechanisms to reroute traffic to the secondary gateway during regional outages.

If above is unclear and/or you are unsure about something add a comment below.

please don’t forget to close the thread by clicking Accept the answer wherever the information provided helps you, as this can be beneficial to other community members.
Ganesh Patapati 5,355 Reputation points Microsoft External Staff

2025-03-24T19:08:19.4266667+00:00

Hello HASSAN BIN NASIR DAR

If it addresses your issue, please accept the solution.

In order to close your thread, I need your confirmation of acceptance.

Please accept an answer if correct. Original posters help the community find answers faster by identifying the correct answer. Here is how.
Ganesh Patapati 5,355 Reputation points Microsoft External Staff

2025-03-31T18:58:33.93+00:00

Hello HASSAN BIN NASIR DAR

Thank you for your valuable time.

In order to close your thread, I need your confirmation of acceptance.

If above is unclear and/or you are unsure about something add a comment below.

please don’t forget to close the thread by clicking Accept the answer wherever the information provided helps you, as this can be beneficial to other community members.
Ganesh Patapati 5,355 Reputation points Microsoft External Staff

2025-03-31T19:04:37.03+00:00

Hello HASSAN BIN NASIR DAR

Thank you for your valuable time.

In order to close your thread, I need your confirmation of acceptance.

please don’t forget to close the thread by clicking Accept the answer wherever the information provided helps you, as this can be beneficial to other community members.
Ganesh Patapati 5,355 Reputation points Microsoft External Staff

2025-04-02T13:11:10.6133333+00:00

Hello HASSAN BIN NASIR DAR

Thank you for your valuable time.

In order to close your thread, I need your confirmation of acceptance.

please don’t forget to close the thread by clicking Accept the answer wherever the information provided helps you, as this can be beneficial to other community members.

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I have created Cross over region Load balancer

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