You can migrate an environment that uses a collapsed cluster.

In a collapsed cluster design, all management VMs, workload VMs, and optionally edges run on the same vSphere cluster that is prepared for NSX-V. The management VMs of the NSX-T must be initially attached to dvPortgroups. After migration, the management VMs of NSX-T will be attached to NSX-T VLAN segments.

The management VMs in the NSX-T include appliances such as NSX Manager, vCenter Server, VMware Identity Manager, and so on. The NSX-T VLAN segment ports to which these management VMs connect are blocked in two cases: when these management VMs are rebooted after they were migrated in-place by the Migration Coordinator, or when they are moved from NSX-V hosts to NSX-T hosts by vMotion in maintenance migration mode. Therefore, the management VMs might lose connectivity in such cases.

To prevent this problem, create a "management_vms" tag category, and add tags in this category. Assign a tag from this category to all the management VMs in the NSX-T environment. These VMs will be attached to unblocked VLAN segment ports.


  1. Log in to the vSphere Client.
  2. Click Menu > Tags & Custom Attributes.
  3. Click Categories, and then click New to add a category.
    Create a category with name management_vms.
  4. Click the Tags tab and add a tag in the management_vms category.
  5. Navigate to Menu > Hosts and Clusters.
  6. Expand the collapsed cluster from the left Navigator view, right-click the name of the NSX Manager VM, and select Tags & Custom Attributes > Assign Tag.
  7. Assign a tag from the management_vms category to the NSX Manager VM.
  8. Repeat steps 6 and 7 for all the management VMs in the cluster.
    For a detailed information about tag categories and tags, see the vCenter Server and Host Management documentation.
  9. Log in to NSX Manager.
  10. Navigate to Inventory > Groups and create a group with the membership criteria Virtual Machine Tag equals management_vms.
  11. Navigate to Security > Distributed Firewall > Actions > Exclusion List and add this group.