Configure your Microsoft Azure resources

After you configure your Google Cloud resources, configure your Microsoft Azure resources.

Before you begin

This section describes required setup and resources.

Provisioned Cross-Cloud Interconnect connections

Before you configure your Azure resources, make sure that Google has provisioned your Cross-Cloud Interconnect connections. After this work is complete, you receive a confirmation email. You can also use the Google Cloud console to verify that the Cross-Cloud Interconnect ports are active, which indicates that the connections have been provisioned. For more information, see Verify that your port is active.

Required Azure resources

Make sure that you have an Azure virtual network (VNet) that includes a subnet. The subnet must be located in an Azure region that is supported for your location. For help, see Quickstart: Use the Azure portal to create a virtual network.

Create an ExpressRoute circuit

An Azure ExpressRoute circuit is similar to a Google Cloud VLAN attachment. The circuit represents a logical connection between your network in Azure and your peer network (in this case, Google Cloud).

When you create an ExpressRoute circuit, Azure automatically creates two circuits: a primary circuit and a redundant one. Azure creates one circuit on your primary ExpressRoute Direct resource and another on your secondary ExpressRoute Direct resource. This behavior differs from Google Cloud, where you had to explicitly create two VLAN attachments.

Azure portal

  1. Go the ExpressRoute Circuits page.

  2. Click Create.

  3. Complete the form displayed on the Basics tab:

  4. Click Next : Configuration.

  5. Complete the form displayed on the Configuration tab:

    • In the Peering type field, select Direct.
    • Select the ExpressRoute Direct resource that you created in Order Azure connections. If you can't find the name of your connection in the dropdown list, go back to the previous page and make sure that you selected the correct region.
    • Use the Circuit bandwidth field to select the appropriate capacity.
    • Use the SKU field to select the appropriate level of service.

  6. Click Next : Tags.

  7. Optional: Set up tags for this port.

  8. Click Next : Review + create.

  9. Review the summary of your choices. If you want to make changes, click Previous and update the form as needed. When the summary looks correct, click Create.

    Azure displays a Deployment is in progress message. After some time, the message should update to say Your deployment is complete.

Azure PowerShell

Use the New-AzExpressRouteCircuit command:

$port = Get-AzExpressRoutePort -Name EXPRESS_ROUTE_DIRECT_CONNECTION `
$circuit = New-AzExpressRouteCircuit `
   -Name NAME `
   -ResourceGroupName RESOURCE_GROUP_NAME `
   -Location LOCATION `
   -SkuTier SKU_TIER `
   -SkuFamily SKU_FAMILY `
   -ExpressRoutePort $port `
   -BandwidthInGbps CAPACITY

Replace the following:

  • EXPRESS_ROUTE_DIRECT_CONNECTION: the name of the ExpressRoute Direct connection that you created in Order Azure ports
  • NAME: the name of the new circuit
  • RESOURCE_GROUP_NAME: the name of the appropriate resource group
  • LOCATION: the region where you created the ExpressRoute Direct connection, as described in Order Azure ports

  • SKU_TIER: the SKU tier; possible values are Standard, Premium, and Local

  • SKU_FAMILY: if you're using LOCAL for SKU, choose UnlimitedData; if you're using STANDARD or PREMIUM, choose MeteredData

  • CAPACITY: the capacity of each circuit

Set up a private peering

Cross-Cloud Interconnect uses Border Gateway Protocol (BGP) to exchange routes between your Virtual Private Cloud (VPC) network and your Azure network. To that end, configure a private BGP peering between your ExpressRoute circuits and your Google Cloud VLAN attachments.

Calculate the IPv4 subnet values

When you create the peering, you provide an IPv4 primary subnet value and an IPv4 secondary subnet value. These values represent the Google Cloud VLAN attachments that you want to connect with.

Check the instructions that you provided

When you provided your Azure LOA to Google, you also provided instructions about how you wanted your ports connected. You need that information to configure the IPv4 Primary subnet and IPv4 Secondary subnet fields.

For example, if your primary ExpressRoute Direct port is connected to the primary Cross-Cloud Interconnect port, do the following:

  • To calculate the IPv4 Primary subnet value, use details about the primary VLAN attachment.

  • To calculate the IPv4 Secondary subnet value, use details about the redundant VLAN attachment.

If your primary ExpressRoute Direct port is connected to the redundant Cross-Cloud Interconnect port, do the reverse. That is, to calculate the IPv4 Secondary subnet value, use details about the primary VLAN attachment. To calculate the IPv4 Primary subnet value, use details about the redundant VLAN attachment.

Calculate the subnet values

To calculate the subnet value, start with the customerRouterIpAddress value of the appropriate VLAN attachment. Subtract 2 from the rightmost segment of the address (the fourth octet). The resulting value is the address that you enter in the IPv4 Primary subnet field or in the IPv4 Secondary subnet field.

For example, suppose the customerRouterIpAddress is 169.254.188.18/30. In this case, the subnet value would be 169.254.188.16/30.

Create the private peering

Azure portal

  1. Go the ExpressRoute Circuits page.

  2. Click the name of the circuit that you created in Create an ExpressRoute circuit.

  3. Click Azure private peering.

  4. Complete the form:

    • Enter the ASN of the Google Cloud Router—for example, 16550.
    • In the Subnets section, enter IPv4.
    • Enter the IPv4 Primary subnet and IPv4 Secondary subnet values that you calculated in Calculate the IPv4 primary subnet value.
    • Enter the same VLAN ID that you entered when creating your VLAN attachments.
    • If you want to use MD5 authentication, enter your MD5 key in the Shared key field. Make sure that you enter the same key that you used when creating BGP sessions in Google Cloud.

  5. Click Save.

Azure PowerShell

Use the following commands:

For example:

$circuit = Get-AzExpressRouteCircuit -Name CIRCUIT_NAME `
   $circuit.Peerings = New-AzExpressRouteCircuitPeeringConfig `
   -Name 'AzurePrivatePeering' `
   -PeeringType 'AzurePrivatePeering' `
   -PeerASN ASN `
   -PrimaryPeerAddressPrefix PRIMARY_SUBNET  `
   -SecondaryPeerAddressPrefix SECONDARY_SUBNET `
   -VlanId VLAN_ID `
   -SharedKey MD5_KEY `
   Set-AzExpressRouteCircuit -ExpressRouteCircuit $circuit

Replace the following:

  • CIRCUIT_NAME: the name of your ExpressRoute circuit
  • ASN: the ASN of the Google Cloud Router
  • PRIMARY_SUBNET and SECONDARY_SUBNET: the values that you arrived at in Calculate the IPv4 primary subnet value
  • VLAN_ID: the VLAN ID that you specified when creating your VLAN attachments
  • MD5_KEY: the key to use for MD5 authentication (optional)

Create a virtual network gateway

An ExpressRoute virtual network gateway connects your Azure network with a peer network—in this case, your Google Cloud VPC network.

Azure portal

  1. Go the Virtual network gateway page.

  2. Click Create.

  3. Select the appropriate Subscription.

  4. Complete the Instance Details section of the form:

    • Enter a Name for the gateway.
    • Select the Region where your connection is located.
    • Select a Gateway type of ExpressRoute.
    • Use the SKU field to select the appropriate level of service.
    • Select a Virtual network that has a subnet in the same region as your ExpressRoute Direct connection.
    • Select a Subnet.

  5. Complete the Public IP address section of the form:

    • For Public IP address, do one of the following:

      • Select Create new, and then enter a Public IP address name for the new address and a SKU.

      • Select Use existing, and select an address that you previously created.

    • Select an Availability zone.

  6. Click Next : Tags.

  7. Optional: Set up tags for the gateway.

  8. Click Next : Review + create.

  9. Click Create.

    Azure displays a Deployment is in progress message. After a few minutes, the message should update to say Your deployment is complete.

Azure PowerShell

Use the following commands:

Complete the following steps:

  1. Create an object that represents your Azure virtual network:

    $vnet = Get-AzVirtualNetwork -Name NETWORK_NAME `
   -ResourceGroupName RESOURCE_GROUP

    Replace the following:

    • NETWORK_NAME: the name of your Azure virtual network
    • RESOURCE_GROUP: the name of the appropriate resource group

  2. Create an object that represents the subnet that you want to use for your circuit:

    $subnet = Get-AzVirtualNetworkSubnetConfig -Name NAME `
   -VirtualNetwork $vnet

    Replace NAME with the name of your subnet.

  3. Allocate a public IP address for the virtual network:

    $pip = New-AzPublicIpAddress -Name NAME `
   -ResourceGroupName RESOURCE_GROUP `
   -Location REGION `
   -AllocationMethod Dynamic

    Replace the following:

    • NAME: the name of your IP address
    • RESOURCE_GROUP: the name of the appropriate resource group
    • REGION: the region where your subnet is located

  4. Create a configuration object:

    $ipconf = New-AzVirtualNetworkGatewayIpConfig `
-Name NAME `
-Subnet $subnet `
-PublicIpAddress $pip

    Replace NAME with a name for your configuration.

  5. Create the gateway:

    $gateway = New-AzVirtualNetworkGateway NAME  `
   -ResourceGroupName RESOURCE_GROUP `
   -Location REGION `
   -IpConfigurations $ipconf `
   -GatewayType Expressroute `
   -GatewaySku SKU

    Replace the following:

    • NAME: the name of the new gateway
    • RESOURCE_GROUP: the name of the appropriate resource group
    • REGION: the region where your subnet is located
    • SKU: the gateway SKU

Create a connection

Create a connection between the following resources:

Azure portal

  1. Go to the Connections page.

  2. Click Create.

  3. Select a Subscription and Resource group.

  4. Complete the Instance Details section of the form:

    • Set Connection type to ExpressRoute.
    • Enter a Name for the connection.
    • Select the Region where your ExpressRoute Direct connection is located.

  5. Click Next : Settings:

    • Select the appropriate Virtual network gateway.
    • Select your ExpressRoute circuit.
    • If appropriate, select Enable Custom BGP Addresses.
    • If appropriate, select Redeem authorization.
    • Enter the appropriate Routing weight value.

  6. Click Next : Tags.

  7. Optional: Set up tags for this port.

  8. Click Next : Review + create.

  9. Review the summary of your choices. If the summary looks correct, click Create. If not, click Previous and make corrections.

    Azure displays a Deployment is in progress message. After a few minutes, the message should update to say Your deployment is complete.

Azure PowerShell

Use the New-AzVirtualNetworkGatewayConnection command:

New-AzVirtualNetworkGatewayConnection `
   -Name CONNECTION_NAME `
   -ResourceGroupName RESOURCE_GROUP `
   -VirtualNetworkGateway1 GATEWAY `
   -Location LOCATION `
   -ConnectionType ExpressRoute `
   -PeerId PEER_ID

Replace the following:

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