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Tutorial: Azure ExpressRoute - Add a gateway to a VNet (Azure portal)
This tutorial walks you through adding a virtual network gateway to a VNet for ExpressRoute using the Azure portal.
expressroute
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expressroute
tutorial
03/03/2021
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Tutorial: Configure a virtual network gateway for ExpressRoute using the Azure portal

[!div class="op_single_selector"]

This tutorial walks you through the steps to add a virtual network gateway for a pre-existing VNet. This article walks you through the steps to add, resize, and remove a virtual network (VNet) gateway for a pre-existing VNet. The steps for this configuration are specifically for VNets that were created using the Resource Manager deployment model that will be used in an ExpressRoute configuration. For more information about virtual network gateways and gateway configuration settings for ExpressRoute, see About virtual network gateways for ExpressRoute.

In this tutorial, you learn how to:

[!div class="checklist"]

  • Create a gateway subnet.
  • Create Virtual Network gateway.

Prerequisites

The steps for this task use a VNet based on the values in the following configuration reference list. We use this list in our example steps. You can copy the list to use as a reference, replacing the values with your own.

Configuration reference list

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

You can view a Video of these steps before beginning your configuration.

Create the gateway subnet

  1. In the portal, navigate to the Resource Manager virtual network for which you want to create a virtual network gateway.

  2. In the Settings section of your VNet, select Subnets to expand the Subnet settings.

  3. In the Subnets settings, select + Gateway subnet to add a gateway subnet.

    :::image type="content" source="./media/expressroute-howto-add-gateway-portal-resource-manager/add-gateway-subnet.png" alt-text="Add the gateway subnet":::

  4. The Name for your subnet is automatically filled in with the value 'GatewaySubnet'. This value is required in order for Azure to recognize the subnet as the gateway subnet. Adjust the autofilled Address range values to match your configuration requirements. We recommend creating a gateway subnet with a /27 or larger (/26, /25, and so on.). If you plan on connecting 16 ExpressRoute circuits to your gateway, you must create a gateway subnet of /26 or larger.

    If you are using a dual stack virtual network and plan to use IPv6-based private peering over ExpressRoute, click Add IP6 address space and input IPv6 address range values.

    Then, select OK to save the values and create the gateway subnet.

    :::image type="content" source="./media/expressroute-howto-add-gateway-portal-resource-manager/add-subnet-gateway.png" alt-text="Adding the subnet":::

Create the virtual network gateway

  1. In the portal, on the left side, select Create a resource, and type 'Virtual Network Gateway' in search. Locate Virtual network gateway in the search return and select the entry. On the Virtual network gateway page, select Create.

  2. On the Create virtual network gateway page, enter, or select these settings:

    Setting Value
    Subscription Verify that the correct subscription is selected.
    Resource Group The resource group will automatically be chosen once you select the virtual network.
    Name Name your gateway. This isn't the same as naming a gateway subnet. It's the name of the gateway object you're creating.
    Region Change the Region field to point to the location where your virtual network is located. If the location isn't pointing to the region where your virtual network is, the virtual network won't appear in the 'Choose a virtual network' dropdown.
    Gateway type Select ExpressRoute
    SKU Select the gateway SKU from the dropdown.
    Virtual network Select TestVNet.
    Public IP address Select Create new.
    Public IP address name Provide a name for the public IP address.

    [!IMPORTANT] If you plan to use IPv6-based private peering over ExpressRoute, please make sure to create your gateway with a Public IP address of type Standard, Static using the PowerShell instructions.

  3. Select Review + Create, and then Create to begin creating the gateway. The settings are validated and the gateway deploys. Creating virtual network gateway can take up to 45 minutes to complete.

Clean up resources

If you no longer need the ExpressRoute gateway, locate the gateway in the virtual network resource group and select Delete. Ensure the gateway doesn't have any connections to a circuit.

:::image type="content" source="./media/expressroute-howto-add-gateway-portal-resource-manager/delete-gateway.png" alt-text="Delete virtual network gateway":::

Next steps

After you've created the VNet gateway, you can link your VNet to an ExpressRoute circuit.

[!div class="nextstepaction"] Link a Virtual Network to an ExpressRoute circuit