Upgrade path from Hub and Spoke to VWAN

[ashley-kainos]

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Description

We have a few customers that have deployed ALZ using hub and spoke and are now wanting to upgrade to VWAN. There is the upgrade path https://learn.microsoft.com/en-us/azure/virtual-wan/migrate-from-hub-spoke-topology but this is just the steps it would be good to know how to do this within ALZ using IaC

Is your feature request related to a problem?

hard to understand how to do upgrade via IaC

Describe the solution you'd like

Clear documentation on how to upgrade to VWAN using IaC and the ALZ module

Additional context

[jtracey93]

Hey @ashley-kainos,

Thanks for the issue/question.

There is no easy migration path as the doc you referenced explains. You could try to use the caf-enterprise-scale module to do a deployment of the VWAN alongside hub and spoke but I wouldn't advise that based on the direction of this module as explained in https://github.com/Azure/terraform-azurerm-caf-enterprise-scale/issues/731.

Instead I would deploy the VWAN using the AVM Pattern Module for VWAN thats available here https://registry.terraform.io/modules/Azure/avm-ptn-virtualwan/azurerm/latest.

You can see the direction we are heading in the example here:

• https://github.com/Azure/terraform-azurerm-avm-ptn-alz/tree/main/examples/alzreference
• https://github.com/Azure/alz-terraform-accelerator/tree/main/templates/complete_vnext

Note the new ALZ AVM module is not ready for production use yet, but the VWAN module is, and thats the part you want 👍

Hope that helps

Thanks

Jack