After you finish the prerequisites for upgrading, your next step is to update the upgrade coordinator to initiate the upgrade process.
For information about upgrading NSX Intelligence version 1.2.x and earlier to NSX Intelligence version 3.2 and later, see the Activating and Upgrading VMware NSX Intelligence documentation at https://docs.vmware.com/en/VMware-NSX-Intelligence/index.html.
For information about upgrading NSX Application Platform, see the Deploying and Managing the VMware NSX Application Platform documentation at https://docs.vmware.com/en/VMware-NSX-T-Data-Center/index.html.
After the upgrade, based on your input, the upgrade coordinator updates the hosts, NSX Edge cluster, and Management plane.
You can use REST APIs to upgrade your NSX-T Data Center appliance. Identify the NSX-T Data Center version you are upgrading to. Refer to the API guide with your product version in code.vmware.com to find the latest upgrade-related APIs.