Configure a virtual network gateway for ExpressRoute using PowerShell

This article helps you add, resize, and remove a virtual network (VNet) gateway for a pre-existing VNet. The steps for this configuration apply to VNets that were created using the Resource Manager deployment model for an ExpressRoute configuration. For more information, see About virtual network gateways for ExpressRoute.

Before beginning

Working with PowerShell

The steps and examples in this article use Azure PowerShell Az modules. To install the Az modules locally on your computer, see Install Azure PowerShell. To learn more about the new Az module, see Introducing the new Azure PowerShell Az module. PowerShell cmdlets are updated frequently. If you are not running the latest version, the values specified in the instructions may fail. To find the installed versions of PowerShell on your system, use the Get-Module -ListAvailable Az cmdlet.

You can use Azure Cloud Shell to run most PowerShell cmdlets and CLI commands, instead of installing Azure PowerShell or CLI locally. Azure Cloud Shell is a free interactive shell that has common Azure tools preinstalled and is configured to use with your account. To run any code contained in this article on Azure Cloud Shell, open a Cloud Shell session, use the Copy button on a code block to copy the code, and paste it into the Cloud Shell session with Ctrl+Shift+V on Windows and Linux, or Cmd+Shift+V on macOS. Pasted text is not automatically executed, press Enter to run code.

There are a few ways to launch the Cloud Shell:

Click Try It in the upper right corner of a code block. Cloud Shell in this article
Open Cloud Shell in your browser. https://shell.azure.com/powershell
Click the Cloud Shell button on the menu in the upper right of the Azure portal. Cloud Shell in the portal

Configuration reference list

The steps for this task use a VNet based on the values in the following configuration reference list. Additional settings and names are also outlined in this list. We don't use this list directly in any of the steps, although we do add variables based on the values in this list. You can copy the list to use as a reference, replacing the values with your own.

  • Virtual Network Name = "TestVNet"
  • Virtual Network address space = 192.168.0.0/16
  • Resource Group = "TestRG"
  • Subnet1 Name = "FrontEnd"
  • Subnet1 address space = "192.168.1.0/24"
  • Gateway Subnet name: "GatewaySubnet" You must always name a gateway subnet GatewaySubnet.
  • Gateway Subnet address space = "192.168.200.0/26"
  • Region = "East US"
  • Gateway Name = "GW"
  • Gateway IP Name = "GWIP"
  • Gateway IP configuration Name = "gwipconf"
  • Type = "ExpressRoute" This type is required for an ExpressRoute configuration.
  • Gateway Public IP Name = "gwpip"

Add a gateway

  1. Connect to your Azure Subscription.

    If you are using the Azure Cloud Shell, you sign in to your Azure account automatically after clicking 'Try it'. To sign in locally, open your PowerShell console with elevated privileges and run the cmdlet to connect.

    Connect-AzAccount
    

    If you have more than one subscription, get a list of your Azure subscriptions.

    Get-AzSubscription
    

    Specify the subscription that you want to use.

    Select-AzSubscription -SubscriptionName "Name of subscription"
    
  2. Declare your variables for this exercise. Be sure to edit the sample to reflect the settings that you want to use.

    $RG = "TestRG"
    $Location = "East US"
    $GWName = "GW"
    $GWIPName = "GWIP"
    $GWIPconfName = "gwipconf"
    $VNetName = "TestVNet"
    
  3. Store the virtual network object as a variable.

    $vnet = Get-AzVirtualNetwork -Name $VNetName -ResourceGroupName $RG
    
  4. Add a gateway subnet to your Virtual Network. The gateway subnet must be named "GatewaySubnet". You should create a gateway subnet that is /27 or larger (/26, /25, etc.).

    Add-AzVirtualNetworkSubnetConfig -Name GatewaySubnet -VirtualNetwork $vnet -AddressPrefix 192.168.200.0/26
    
  5. Set the configuration.

    $vnet = Set-AzVirtualNetwork -VirtualNetwork $vnet
    
  6. Store the gateway subnet as a variable.

    $subnet = Get-AzVirtualNetworkSubnetConfig -Name 'GatewaySubnet' -VirtualNetwork $vnet
    
  7. Request a public IP address. The IP address is requested before creating the gateway. You cannot specify the IP address that you want to use; it’s dynamically allocated. You'll use this IP address in the next configuration section. The AllocationMethod must be Dynamic.

    $pip = New-AzPublicIpAddress -Name $GWIPName  -ResourceGroupName $RG -Location $Location -AllocationMethod Dynamic
    
  8. Create the configuration for your gateway. The gateway configuration defines the subnet and the public IP address to use. In this step, you are specifying the configuration that will be used when you create the gateway. This step does not actually create the gateway object. Use the sample below to create your gateway configuration.

    $ipconf = New-AzVirtualNetworkGatewayIpConfig -Name $GWIPconfName -Subnet $subnet -PublicIpAddress $pip
    
  9. Create the gateway. In this step, the -GatewayType is especially important. You must use the value ExpressRoute. After running these cmdlets, the gateway can take 45 minutes or more to create.

    New-AzVirtualNetworkGateway -Name $GWName -ResourceGroupName $RG -Location $Location -IpConfigurations $ipconf -GatewayType Expressroute -GatewaySku Standard
    

Verify the gateway was created

Use the following commands to verify that the gateway has been created:

Get-AzVirtualNetworkGateway -ResourceGroupName $RG

Resize a gateway

There are a number of Gateway SKUs. You can use the following command to change the Gateway SKU at any time.

Important

This command doesn't work for UltraPerformance gateway. To change your gateway to an UltraPerformance gateway, first remove the existing ExpressRoute gateway, and then create a new UltraPerformance gateway. To downgrade your gateway from an UltraPerformance gateway, first remove the UltraPerformance gateway, and then create a new gateway.

$gw = Get-AzVirtualNetworkGateway -Name $GWName -ResourceGroupName $RG
Resize-AzVirtualNetworkGateway -VirtualNetworkGateway $gw -GatewaySku HighPerformance

Remove a gateway

Use the following command to remove a gateway:

Remove-AzVirtualNetworkGateway -Name $GWName -ResourceGroupName $RG

Next steps

After you have created the VNet gateway, you can link your VNet to an ExpressRoute circuit. See Link a Virtual Network to an ExpressRoute circuit.