Global Vnet Peering

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Global Vnet Peering Configuration 

ØGlobal VNet Peering enables peering virtual networks in different Azure regions.

ØTraffic that flows through peered virtual networks never leaves the Microsoft backbone network.

ØGlobal VNet Peering is currently available in the following regions:

§US West Central

§Canada Central

§US West 2

Register for the Global VNet Peering preview

1. Install the latest version of the PowerShell AzureRm module. If you're new to Azure PowerShell, see Azure PowerShell overview.
2. Start a PowerShell session and log in to Azure using the Login-AzureRmAccount command.
3. Register your subscription for the preview by entering the following commands:
   PowerShell

   Register-AzureRmProviderFeature `
     -FeatureName AllowGlobalVnetPeering `
     -ProviderNamespace Microsoft.Network
   
   Register-AzureRmResourceProvider `
     -ProviderNamespace Microsoft.Network
   

   Do not complete the steps in the Portal, Azure CLI, or PowerShell sections of this article until the RegistrationState output you receive after entering the following command is Registered for both subscriptions:
   PowerShell

   Get-AzureRmProviderFeature `
     -FeatureName AllowGlobalVnetPeering `
     -ProviderNamespace Microsoft.Network

Reference Link : https://docs.microsoft.com/en-us/azure/virtual-network/virtual-network-create-peering#register