BYOIP & Cross Region Load Balancing

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BYOIP & Cross Region Load Balancing

Nilesh Joshi 36

Hello,

I'm designing multi-region Varnish CDN solution using Azure Marketplace Varnish Enterprise software. I plan to lay-out 2 instances per region and plan to place the VM's in three regions. To handle the traffic, each region will have standard LB in-front of 2 Varnish instances and all three standard LB's will be fronted by global/cross region LB.

I'm having a requirement where I would like to keep my existing public IP intact and hence I'm looking for an option of BYOIP. Is there a support of BYOIP for global/cross region load balancer in Azure?

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Answer 1

GitaraniSharma-MSFT 50,096 Microsoft Employee Moderator

Hello @Nilesh Joshi ,

Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.

I understand that you would like know if it is possible to implement a multi-region load balancing setup with global/cross region load balancer in Azure with custom IP/BYOIP (Bring your own IP).

As mentioned in the BYOIP limitations,

Custom IP prefixes do not currently support derivation of IPs with Internet Routing Preference or that use Global Tier (for cross-region load-balancing).

Also, note that Cross-region load balancer is currently in preview. This preview version is provided without a service level agreement, and it's not recommended for production workloads. Certain features might not be supported or might have constrained capabilities.
Refer : https://learn.microsoft.com/en-us/azure/load-balancer/cross-region-overview

Kindly let us know if the above helps or you need further assistance on this issue.

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Nilesh Joshi 36 Reputation points

2022-07-20T11:58:42.61+00:00

Thank you for prompt response. Appreciate it.
Nilesh Joshi 36 Reputation points

2022-07-20T16:43:50.097+00:00

I've a follow-up question: If cross region LB isn't an option for production then what are other alternatives to distribution the traffic across server resources located in multiple regions? Is there any alternative native managed service?
GitaraniSharma-MSFT 50,096 Reputation points Microsoft Employee Moderator

2022-07-21T10:47:32.927+00:00
Hello @Nilesh Joshi ,

We have the below global load balancers to distribute traffic across server resources located in multiple regions:

Azure Front Door - for HTTP(S) traffic. Front Door has Layer 7 capabilities: SSL offload, path-based routing, fast failover, caching, and others to improve performance and high-availability of your applications. You might experience faster packet travel times because the infrastructure is onboarded on Azure network sooner.

Azure Traffic Manager - For non-HTTP(S) traffic. Traffic Manager is a DNS-based load-balancing service. It balances and fails over only at the DNS level. For that reason, it can't fail over as quickly as Front Door, because of common challenges around DNS caching and systems not honoring DNS TTLs.

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

Azure Traffic Manager supports six traffic-routing methods to determine how to route network traffic to the various service endpoints.
Refer : https://learn.microsoft.com/en-us/azure/traffic-manager/traffic-manager-routing-methods
https://learn.microsoft.com/en-us/azure/architecture/example-scenario/infrastructure/multi-tier-app-disaster-recovery

Azure Front Door supports four different traffic routing methods to determine how your HTTP/HTTPS traffic is distributed between different origins.
Refer : https://learn.microsoft.com/en-us/azure/frontdoor/routing-methods
https://learn.microsoft.com/en-us/azure/frontdoor/quickstart-create-front-door

Regards,
Gita
Nilesh Joshi 36 Reputation points

2022-07-22T17:48:13.49+00:00

Thank you Gita, this is helpful. Sorry but yet another follow-up or in fact a question out of curiosity. What is/are the major differentiating factor(s) among Azure Front Door and Global/Cross Region LB (preview).
GitaraniSharma-MSFT 50,096 Reputation points Microsoft Employee Moderator

2022-07-25T14:50:02.8+00:00

Hello @Nilesh Joshi ,

The major differentiating factors among Azure Front Door and Cross Region LB (preview) are CDN & WAF functionalities offered by Azure Front Door which are no t available in Cross region load balancer.

Cross-region load balancer is built on existing load balancer solution to enable geo-redundant high availability scenarios such as Instant global failover, load distribution across regions to the closest Azure region with ultra-low latency, ability to scale up/down, static anycast global IP address & Client IP preservation.

However, Azure Front Door is a Content Delivery Network (CDN) that provides fast, reliable, and secure access to your applications’ static and dynamic web content across the globe with WAF solution which provides centralized protection for your web applications. It also has Private link support on Premium tier.

Regards,
Gita

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