VMware NSX-T 3.x Federation

Federation Systems: Global Manager and Local Manager
A Federation environment includes two types of management systems:
Global Manager: a system similar to NSX Manager that federates multiple Local Managers.

Local Manager: an NSX Manager system in charge of network and security services for a location.

Federation Span: Local and Stretched
When you create a networking object from Global Manager, it can span one or more locations.
Local: the object spans only one location.
Stretched: the object spans more than one location.
You do not directly configure the span of a segment. A segment has the same span as the gateway it is attached to.

Federation Regions
Security objects have a region. The region can be one of the following:
Location: a region is automatically created for each location. This region has the span of that location.
Global: a region that has the span of all available locations.
Custom Region: you can create regions that include a subset of the available locations.
Federation Tunnel Endpoints
In a Federation environment, there are two types of tunnel endpoints.
Tunnel End Point (TEP): the IP address of a transport node (Edge node or Host) used for Geneve encapsulation within a location.
Remote Tunnel End Points (RTEP): the IP address of a transport node (Edge node only) used for Geneve encapsulation across locations.