Within certain limitations, you can migrate vSphere Distributed Switches that are not part of an NSX Data Center for vSphere environment.

Required Software and Versions

Limitations and Recommendations

If your current vSphere implementation uses vSphere Distributed Switch version 7.0, migration to NSX-T Data Center version 3.x is not supported.

It is recommended you install NSX-T Data Center separately and configure it to use with your current vSphere implementation.