Starting NSX-T Data Center 3.1.1 you can upgrade the clusters that have vSphere Lifecycle Manager enabled.
Prerequisites
Verify that you have configured the overall hosts upgrade plan. See Configure Hosts.
Procedure
What to do next
You can proceed with the upgrade only after the upgrade process finishes successfully. If some of the hosts are disabled, you must enable and upgrade them before you proceed. See Upgrade Management Plane.
If there are upgrade errors, you must resolve the errors. See Troubleshooting Upgrade Failures.