Azure front door classic to premium migration setup

@Kalimuthu, Subbiah

Thank you for reaching out.

I understand that you are migrating your existing Azure front door Classic to premium SKU and wish to know if you need to update the DNS record which is already pointed Classic AFD.

You don't need to make any DNS changes before or during this migration process. However, once the migration completes and traffic is flowing through your new Azure Front Door profile, you need to update your DNS records.

Your old Azure Front Door (classic) instance uses a different fully qualified domain name (FQDN) than Azure Front Door Standard and Premium. For example, an Azure Front Door (classic) endpoint might be contoso.azurefd.net, while the Azure Front Door Standard or Premium endpoint might be contoso-mdjf2jfgjf82mnzx.z01.azurefd.net

You don't need to update your DNS records before or during the migration process. Azure Front Door automatically sends traffic that it receives on the Azure Front Door (classic) endpoint to your Azure Front Door Premium profile without you making any configuration changes.

However, once your migration is finished, we strongly recommend that you update your DNS records to direct traffic to the new Azure Front Door Premium endpoint. Changing your DNS records helps to ensure that your profile continues to work in the future. The change in DNS record won't cause any downtime. You don't need to plan ahead for this update to happen, and can schedule it at your convenience. This is currently documented here.

Hope this helps! Please let me know if you have any questions. Thank you!

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