Merge pull request #264019 from siddomala/VMSSUpdate2

Updating VMSS Migration Docs

Author: prmerger-automator[bot]

articles/virtual-wan/virtual-wan-faq.md

@@ -431,6 +431,10 @@ No. Virtual WAN does not support ASN changes for VPN gateways.
 
 ### <a name="update-router"></a>Why am I seeing a message and button called "Update router to latest software version" in portal?
 
+> [!NOTE]
+> As of January 2024, the Virtual WAN team has started upgrading virtual hubs to the latest version. If you did not upgrade your hub but now notice that your hub's Router Version says "latest", then your hub was upgraded by the Virtual WAN team.
+>
+
 Azure-wide Cloud Services-based infrastructure is deprecating. As a result, the Virtual WAN team has been working on upgrading virtual routers from their current Cloud Services infrastructure to Virtual Machine Scale Sets based deployments. **All newly created Virtual Hubs will automatically be deployed on the latest Virtual Machine Scale Sets based infrastructure.** If you navigate to your Virtual WAN hub resource and see this message and button, then you can upgrade your router to the latest version by clicking on the button. If you would like to take advantage of new Virtual WAN features, such as [BGP peering with the hub](create-bgp-peering-hub-portal.md), you'll have to update your virtual hub router via Azure portal. If the button isn't visible, open a support case.
 
 You’ll only be able to update your virtual hub router if all the resources (gateways/route tables/VNet connections) in your hub are in a succeeded state. Make sure all your spoke virtual networks are in active/enabled subscriptions and that your spoke virtual networks aren't deleted. Additionally, as this operation requires deployment of new virtual machine scale sets based virtual hub routers, you’ll face an expected downtime of 1-2 minutes for VNet-to-VNet traffic through the same hub and 5-7 minutes for all other traffic flows through the hub. Within a single Virtual WAN resource, hubs should be updated one at a time instead of updating multiple at the same time. When the Router Version says “Latest”, then the hub is done updating. There will be no routing behavior changes after this update.