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This article helps you create a connection to link a virtual network (virtual network) to Azure ExpressRoute circuits using the Azure portal. The virtual networks that you connect to your Azure ExpressRoute circuit can either be in the same subscription or part of another subscription.
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> [!NOTE]
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> BGP configuration information will not appear if the layer 3 provider configured your peerings. If your circuit is in a provisioned state, you should be able to create connections.
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### To create a connection
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::: zone pivot="expressroute-preview"
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1. Sign in to the Azure portal with this [Preview link](https://aka.ms/expressrouteguidedportal). This link is required to access the new preview connection create experience to an ExpressRoute circuit.
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::: zone-end
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1. Sign in to the [Azure portal](https://portal.azure.com).
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2. Ensure that your ExpressRoute circuit and Azure private peering have been configured successfully. Follow the instructions in [Create an ExpressRoute circuit](expressroute-howto-circuit-arm.md) and [Create and modify peering for an ExpressRoute circuit](expressroute-howto-routing-arm.md). Your ExpressRoute circuit should look like the following image:
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4. Select the **Connection type** as **ExpressRoute** and then select **Next: Settings >**.
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:::image type="content" source="./media/expressroute-howto-linkvnet-portal-resource-manager/create-connection-basic-new.png" alt-text="Screenshot of create a connection basic page.":::
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:::image type="content" source="./media/expressroute-howto-linkvnet-portal-resource-manager/connection-object.png" alt-text="Screenshot of a created connection resource.":::
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::: zone-end
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::: zone pivot="expressroute-current"
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4. Enter a name for the connection and then select **Next: Settings >**.
5. Select the gateway that belongs to the virtual network that you want to link to the circuit and select **Review + create**. Then select **Create** after validation completes.
## Connect a virtual network to a circuit - different subscription
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You can share an ExpressRoute circuit across multiple subscriptions. The following figure shows a simple schematic of how sharing works for ExpressRoute circuits across multiple subscriptions.
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> [!NOTE]
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> To view your Gateway connections, go to your ExpressRoute circuit in Azure portal. From there, navigate to *Connections* underneath *Settings* for your ExpressRoute circuit. This will show you each ExpressRoute gateway that your circuit is connected to. If the gateway is under a different subscription than the circuit, the *Peer* field will display the circuit authorization key.
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:::image type="content" source="./media/expressroute-howto-linkvnet-portal-resource-manager/create-new-resources.png" alt-text="Create new resources":::
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1.Make sure the *Connection type* is set to **ExpressRoute**. Select the *Resource group* and *Location*, then select **OK** in the Basics page.
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1.In the **Basics** page, make sure the *Connection type* is set to **ExpressRoute**. Select the *Resource group*, and then select **Next: Settings>**.
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> [!NOTE]
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> The location *must* match the virtual network gateway location you're creating the connection for.
1. In the **Settings** page, Select the *Virtual network gateway* and check the **Redeem authorization** check box. Enter the *Authorization key* and the *Peer circuit URI* and give the connection a name. Select **OK**.
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1. In the **Settings** page, select **High Resiliency** or **Standard Resiliency**, and then select the *Virtual network gateway*. Check the **Redeem authorization** check box. Enter the *Authorization key* and the *Peer circuit URI* and give the connection a name.
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> [!NOTE]
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> The *Peer Circuit URI* is the Resource ID of the ExpressRoute circuit (which you can find under the Properties Setting pane of the ExpressRoute Circuit).
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> - Connecting to circuits in a different subscription isn't supported for Maximum Resiliency.
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> - You can connect a virtual network to a Metro circuit in a different subscription when choosing High Resiliency.
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> - You can connect a virtual network to a regular (non-metro) circuit in a different subscription when choosing Standard Resiliency.
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> - The *Peer Circuit URI* is the Resource ID of the ExpressRoute circuit (which you can find under the Properties Setting pane of the ExpressRoute Circuit).
You can enable [ExpressRoute FastPath](expressroute-about-virtual-network-gateways.md) if your virtual network gateway is Ultra Performance or ErGw3AZ. FastPath improves data path performance such as packets per second and connections per second between your on-premises network and your virtual network.
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::: zone-end
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[FastPath](expressroute-about-virtual-network-gateways.md) improves data path performance such as packets per second and connections per second between your on-premises network and your virtual network.
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**Configure FastPath on a new connection**
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### Configure FastPath on a new connection
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When adding a new connection for your ExpressRoute gateway, select the checkbox for **FastPath**.
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:::image type="content" source="./media/expressroute-howto-linkvnet-portal-resource-manager/enable-fastpath-portal.png" alt-text="Screenshot of FastPath checkbox in add a connection page.":::
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> [!NOTE]
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> Enabling FastPath for a new connection is only available through creating a connection from the gateway resource. New connections created from the ExpressRoute circuit or from the Connection resource page is not supported.
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**Configure FastPath on an existing connection**
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### Configure FastPath on an existing connection
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1. Go to the existing connection resource either from the ExpressRoute gateway, the ExpressRoute circuit, or the Connection resource page.
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> [!NOTE]
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> You can use [Connection Monitor](how-to-configure-connection-monitor.md) to verify that your traffic is reaching the destination using FastPath.
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## Enroll in ExpressRoute FastPath features (preview)
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In this tutorial, you learned how to connect a virtual network to a circuit in the same subscription and in a different subscription. For more information about ExpressRoute gateways, see: [ExpressRoute virtual network gateways](expressroute-about-virtual-network-gateways.md).
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