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Forward events from one Azure Event Grid namespace topic to another namespace topic (Preview)

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Forwarding events from one Azure Event Grid namespace topic to another namespace topic is a straightforward process that enhances the flexibility and scalability of your event-driven architecture. Whether you're working within the same resource or across different resources, Azure Event Grid namespace provides a seamless way to forward events efficiently.

You can forward events from a topic in one namespace to another topic in the same namespace.

Diagram that illustrates forwarding of events from one namespace topic to another topic in the same namespace.

You can also forward events from a topic in one namespace to a topic in another namespace.

Diagram that illustrates forwarding of events from one namespace topic to another topic in a different namespace.

Enable managed identity for the source namespace

In this step, you enable managed identity for the source namespace (namespace that contains the source topic). Select the identity that fits better to your scenario. See Best practice recommendations for managed system identities. Here, we use system assigned identity for demo purposes.

  1. Navigate to the Azure portal page for the namespace that has the source topic.

  2. Select Identity on the left navigation menu.

  3. On the System assigned tab, select On for Status.

  4. Select Save on the command bar to save the setting.

    Screenshot that shows the Identity page for a namespace with system-assigned managed identity enabled.

  5. On the popup window, select Yes to confirm enabling of managed identity for the namespace.

    Screenshot that shows the confirmation window.

  6. Confirm that the system-assigned managed identity is assigned to the namespace that has the source topic.

    Screenshot that shows the system-assigned managed identity for the source namespace.

Grant identity the permission to send events to the destination topic

In this step, you add the managed identity of the source namespace to the Event Grid Data Sender role on the destination namespace. This step enables the source namespace to be able to send or forward events to the destination namespace.

  1. Navigate to the Azure portal page for the namespace that has the destination topic.

  2. Select Access Control (IAM), and then select Add a role assignment.

    Screenshot that shows the Access control page of the destination namespace.

  3. On the Role tab of the Add role assignment page, select the EventGrid Data Sender role, and then select Next.

    Screenshot that shows the selection of Event Grid Data Sender role.

  4. On the Members tab, select Managed identity, and then select + Select members.

  5. In the Select managed identities window, follow these steps:

    1. For Subscription, Select your Azure subscription.

    2. For Managed identity, select Event Grid Namespace.

    3. Select the managed identity for the source namespace you created earlier.

    4. Choose Select at the bottom of the page.

      Screenshot that shows the assignment of Event Grid Data Sender role to the source topic's identity.

  6. Now, on the Add role assignment page, select Review + assign.

    Screenshot that shows the selection of Review + assign on the Add role assignment page.

  7. On the Review + assign page, review settings, and select Review + assign.

Create an event subscription to the source topic with destination topic as the endpoint

In this step, you create an event subscription on the source namespace topic using the destination namespace topic so that the events are forwarded to the destination namespace topic.

  1. Navigate to the source topic page in the Azure portal. On the Event Grid Namespace Topic page, select + Subscription on the command bar.

    Screenshot that shows the Create Subscription button selected.

  2. On the Create Subscription page, enter a name for the event subscription.

  3. Select Event Grid Namespace Topic as an endpoint destination, and select Configure an endpoint.

    Screenshot that shows the Create Subscription window with Event Grid Namespace Topic endpoint selected.

  4. On the Select Event Grid Namespace Topic page, follow these steps:

    1. Select the Azure subscription, Resource group, and Event Grid namespace in which the destination namespace topic exits.

    2. For Event Grid Namespace Topic, select the destination namespace topic.

      Screenshot that shows the Select Event Grid Namespace Topic window.

  5. In the Managed identity for delivery section, select Refresh.

    Screenshot that shows the Create Subscription page with system assigned identity option selected.

  6. Select the system assigned managed identity for your source topic, and then select Create.

Related content

For a list of supported event handlers, see Namespace topic push delivery event handlers.