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When you create a rule collection, you define the local routing settings. The local routing settings determine how traffic is routed within the same virtual network or subnet. The following are the local routing settings:
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|**Local routing setting**|**Description**|
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|---------------------------|-----------------|
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|**Direct routing within virtual network**| Route traffic directly to the destination within the same virtual network. |
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|**Direct routing within subnet**| Route traffic directly to the destination within the same subnet. |
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|**Not specified**| Route traffic to the next hop specified in the route rule. |
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When you select **Direct routing within virtual network** or **Direct routing within subne**t, a UDR with a virtual network next hop is created for local traffic routing within the same virtual network or subnet. However, if the destination CIDR is fully contained within the source CIDR under these selections and direct routing is selected, a UDR specifying a network appliance as the next hop won't be set up.
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## Adding additional virtual networks
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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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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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## Limitations of UDR management
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@@ -128,7 +117,8 @@ The following are the limitations of UDR management with Azure Virtual Network M
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- When you create a route rule with the same destination as an existing route in the route table, the routing rule is ignored.
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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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- 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.
:::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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> [!NOTE]
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> With the **Local route setting** option, you can choose how to route traffic within the same virtual network or subnet. For more information, see [Local route settings](concept-user-defined-route-management.md#local-routing-settings).
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1. Under **Routing rules**, select **+ add**.
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1. In **Add a routing rule**, enter, or select the following information:
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