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I just created a new VNET with address space 10.0.0.0/16 on West US, but got an warning on Azure portal says, The address space '10.0.0.0/16' overlaps with '10.0.0.0/16' in virtual network xxx. The VNET xxx was created before on another region.
Is it really an issue?
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Yes. You can peer VNets across subscriptions and across regions.
You can connect virtual networks to each other with virtual network peering. These virtual networks can be in the same region or different regions (also known as global virtual network peering).
You can update (add or remove) address space on a virtual network that is peered with another virtual network in the same region or across regions.
Azure VNet is the networking layer of Azure VMs. A VNet spans all the Availability Zones in the region. After creating a VNet, you can add one or more subnets in each Availability Zone.
It is only an issue if you connect the two VNETs together. That's why it's only a warning.
If you don't set up a VNET-to-VNET connection between the two, it is not a problem.
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