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Copy file name to clipboardExpand all lines: articles/virtual-network-manager/concept-user-defined-route.md
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@@ -4,7 +4,7 @@ description: Learn to automate and simplifying routing behaviors using user-defi
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author: mbender-ms
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ms.author: mbender
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ms.topic: overview
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ms.date: 05/09/2024
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ms.date: 10/23/2024
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ms.service: azure-virtual-network-manager
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ms.custom: references_regions
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# Customer Intent: As a network engineer, I want learn how I can automate and simplify routing within my Azure Network using User-defined routes.
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This article provides an overview of UDR management, why it's important, how it works, and common routing scenarios that you can simplify and automate using UDR management.
> User-defined routes management with Azure Virtual Network Manager is in public preview. Public previews are made available to you on the condition that you agree to the [Supplemental Terms of Use for Microsoft Azure Previews](https://azure.microsoft.com/support/legal/preview-supplemental-terms/). Some features might not be supported or might have constrained capabilities. This preview version is provided without a service level agreement, and it's not recommended for production workloads.
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## What is UDR management?
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Azure Virtual Network Manager (AVNM) allows you to describe your desired routing behavior and orchestrate user-defined routes (UDRs) to create and maintain the desired routing behavior. User-defined routes address the need for automation and simplification in managing routing behaviors. Currently, you’d manually create User-Defined Routes (UDRs) or utilize custom scripts. However, these methods are prone to errors and overly complicated. You can utilize the Azure-managed hub in Virtual WAN. This option has certain limitations (such as the inability to customize the hub or lack of IPV6 support) not be relevant to your organization. With UDR management in your virtual network manager, you have a centralized hub for managing and maintaining routing behaviors.
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## How does UDR management work?
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In virtual network manager, you create a routing configuration. Inside the configuration, you create rule collections to describe the UDRs needed for a network group (target network group). In the rule collection, route rules are used to describe the desired routing behavior for the subnets or virtual networks in the target network group. Once the configuration is created, you'll need to [deploy the configuration](./concept-deployments.md) for it to apply to your resources. Upon deployment, all routes are stored in a route table located inside a virtual network manager-managed resource group.
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In virtual network manager, you create a routing configuration. Inside the configuration, you create rule collections to describe the UDRs needed for a network group (target network group). In the rule collection, route rules are used to describe the desired routing behavior for the subnets or virtual networks in the target network group. Once the configuration is created, you need to [deploy the configuration](./concept-deployments.md) for it to apply to your resources. Upon deployment, all routes are stored in a route table located inside a virtual network manager-managed resource group.
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Routing configurations create UDRs for you based on what the route rules specify. For example, you can specify that the spoke network group, consisting of two virtual networks, accesses the DNS service's address through a Firewall. Your network manager creates UDRs to make this routing behavior happen.
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| hub and spoke network with Spoke network to on-premises needs to go via Network Virtual Appliance ||
When you add additional virtual networks to a network group, the routing configuration is automatically applied to the new virtual network. Your network manager automatically detects the new virtual network and applies the routing configuration to it. When you remove a virtual network from the network group, the applied routing configuration is automatically removed as well.
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When you add other virtual networks to a network group, the routing configuration is automatically applied to the new virtual network. Your network manager automatically detects the new virtual network and applies the routing configuration to it. When you remove a virtual network from the network group, the applied routing configuration is automatically removed as well.
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Newly created or deleted subnets will have their route table updated with eventual consistency. The processing time may vary based on the volume of subnet creation and deletion.
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Newly created or deleted subnets have their route table updated with eventual consistency. The processing time may vary based on the volume of subnet creation and deletion.
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## Limitations of UDR management
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- When a virtual network manager-created UDR is manually modified in the route table, the route isn't up when an empty commit is performed. Also, any update to the rule isn't reflected in the route with the same destination.
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- Existing Azure services in the Hub virtual network maintain their existing limitations with respect to Route Table and UDRs.
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- Azure Virtual Network Manager requires a managed resource group to store the route table. If you need to delete the resource group, deletion must happen before any new deployments are attempted for resources in the same subscription.
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- UDR Management supports creating 1000 UDRs within a route table. This means that you can create a routing configuration with a maximum of 1000 routing rules.
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- UDR Management supports creating 1000 UDRs within a route table. This means that you can create a routing configuration with a maximum of 1,000 routing rules.
> User-defined routes management with Azure Virtual Network Manager is in public preview. Public previews are made available to you on the condition that you agree to the [Supplemental Terms of Use for Microsoft Azure Previews](https://azure.microsoft.com/support/legal/preview-supplemental-terms/). Some features might not be supported or might have constrained capabilities. This preview version is provided without a service level agreement, and it's not recommended for production workloads.
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## Prerequisites
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| Setting | Value |
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| ------- | ----- |
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|**Subscription**| Select the subscription where you want to deploy Virtual Network Manager. |
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|**Resource group**| Select **Create new** and enter **rg-vnm**.</br> Select **Ok**. |
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|**Name**| Enter **vnm-1**. |
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|**Region**| Select **(US) East US** or a region of your choosing. Virtual Network Manager can manage virtual networks in any region. The selected region is where the Virtual Network Manager instance is deployed. |
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|**Resource group**| Select **Create new** and enter **resource-group**.</br> Select **Ok**. |
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|**Name**| Enter **network-manager**. |
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|**Region**| Select **(US) West US 2** or a region of your choosing. Virtual Network Manager can manage virtual networks in any region. The selected region is where the Virtual Network Manager instance is deployed. |
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|**Description**|*(Optional)* Provide a description about this Virtual Network Manager instance and the task it's managing. |
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|[Features](concept-network-manager-scope.md#features)| Select **User defined routing** from the dropdown list. |
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| Setting | Value |
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| ------- | ----- |
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|**Subscription**| Select the subscription where you want to deploy this virtual network. |
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|**Resource group**| Select **rg-vnm**. |
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|**Resource group**| Select **resource-group**. |
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|**Virtual network name**| Enter **vnet-spoke-001**. |
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|**Region**| Select **(US) East US**. |
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|**Region**| Select **(US) West US 2**. |
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1. Select **Next > Next** or the **IP addresses** tab.
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1. On the **IP addresses** tab, enter an IPv4 address range of **10.0.0.0** and **/16**.
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1. Under **Subnets**, select **default** and enter the following information in the **Edit Subnet** window:
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| Setting | Value |
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| ------- | ----- |
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|**Subscription**| Select the same subscription that you selected in step 2. |
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|**Resource group**| Select **rg-vnm**. |
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|**Resource group**| Select **resource-group**. |
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|**Virtual network name**| Enter **vnet-spoke-002**. |
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|**Region**| Select **(US) East US**. |
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|**Region**| Select **(US) West US 2**. |
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|**Edit subnet window**||
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|**Subnet purpose**| Leave as **Default**. |
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|**Name**| Leave as **default**. |
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In this step, you create a network group containing your virtual networks using Azure policy.
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1. From the **Home** page, select **Resource groups** and browse to the **rg-vnm** resource group, and select the **vnm-1** Virtual Network Manager instance.
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1. From the **Home** page, select **Resource groups** and browse to the **resource-group** resource group, and select the **vnm-1** Virtual Network Manager instance.
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1. Under **Settings**, select **Network groups**. Then select **Create**.
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1. On the **Create a network group** pane, enter the following information:
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| Setting | Value |
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| ------- | ----- |
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|**Name**| Enter **ng-spoke**. |
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|**Name**| Enter **network-group**. |
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|**Description**|*(Optional)* Provide a description about this network group. |
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|**Member type**| Select **Virtual network**. |
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1. Select **Create**.
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1. Select **ng-spoke** and choose **Create Azure Policy**.
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:::image type="content" source="media/how-to-deploy-user-defined-routes/network-group-page.png" alt-text="Screenshot of network group page with options for group creation and membership view.":::
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1. Select **network-group** and choose **Create Azure Policy**.
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1. In **Create Azure Policy**, enter or select the following information:
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| Setting | Value |
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| ------- | ----- |
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|**Policy name**| Enter **ng-azure-policy**. |
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|**Policy name**| Enter **azure-policy**. |
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|**Scope**| Select **Select Scope** and choose your subscription, if not already selected. |
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1. Under **Criteria**, enter a conditional statement to define the network group membership. Enter or select the following information:
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|**Name**| Enter **rule-collection-1**. |
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|**Description**|*(Optional)* Provide a description about this rule collection. |
:::image type="content" source="media/how-to-deploy-user-defined-routes/add-rule-collection.png" alt-text="Screenshot of Add a rule collection window with target network group selected.":::
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|**Include user defined routing configurations in your goal state**| Select checkbox. |
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|**User defined routing configurations**| Select **routing-configuration**. |
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|**Region**||
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|**Target regions**| Select **(US) East US**. |
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|**Target regions**| Select **(US) West US 2)**. |
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1. Select **Next** and then **Deploy** to deploy the routing configuration.
description: Learn to manage User Defined Routes (UDRs) across multiple hub-and-spoke topologies with Azure Virtual Network Manager.
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author: mbender-ms
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ms.author: mbender
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ms.date: 08/02/2024
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ms.date: 10/23/2024
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ms.service: azure-virtual-network-manager
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ms.topic: how-to
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# customer intent: As a network administrator, I want to deploy a Spoke-to-Spoke topology with two hubs using Virtual Network Manager.
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In this article, you learn how to deploy multiple hub-and-spoke topologies, and manage user-defined routes (UDRs) with Azure Virtual Network Manager. This scenario is useful when you have a hub and spoke architecture in multiple Azure regions. In the past, customers with firewalls or network virtual appliances performed many manual operations to do cross-hub and spoke in the past. Users needed many user-defined routes(UDRs) to be set up by hand, and when there were changes in spoke virtual networks, such as adding new spoke virtual networks and subnets, they also needed to change user-defined routes and route tables. UDR management with Virtual Network Manager can help you automate these tasks.
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> [!IMPORTANT]
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> User-defined routes management with Azure Virtual Network Manager is in public preview. Public previews are made available to you on the condition that you agree to the [Supplemental Terms of Use for Microsoft Azure Previews](https://azure.microsoft.com/support/legal/preview-supplemental-terms/). Some features might not be supported or might have constrained capabilities. This preview version is provided without a service level agreement, and it's not recommended for production workloads.
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## Prerequisites
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:::image type="content" source="media/how-to-manage-user-defined-routes-multiple-hub-spoke-topologies/spoke-to-spoke-two-hubs-topology-network-manager.png" alt-text="Diagram of a multi-hub topology with hub-and-spoke virtual network topologies.":::
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