One NSX Manager is assigned the role of primary NSX Manager, and the others are assigned the role of secondary NSX Manager. The primary NSX Manager is used to deploy a universal controller cluster that provides the control plane for the cross-vCenter NSX environment. The secondary NSX Managers do not have their own controller clusters. The primary NSX Manager can create universal objects, such as universal logical switches. These objects are synchronized to the secondary NSX Managers by the NSX Universal Synchronization Service. You can view these objects from the secondary NSX Managers, but you cannot edit them there. You must use the primary NSX Manager to manage universal objects. The primary NSX Manager can be used to configure any of the secondary NSX Managers in the environment.

The following Universal objects are supported:

Universal LDR
Universal Transport Zone
Universal Logical Switch
Universal Firewall Rule
Universal Security Group
Universal IPSets
Universal Service
Universal Service Groups
Universal Segment Range