NSX-T Data Center supports a 2-tier routing model.
In the top tier is the tier-0 logical router. Northbound, the tier-0 logical router connects to one or more physical routers or layer 3 switches and serves as a gateway to the physical infrastructure. Southbound, the tier-0 logical router connects to one or more tier-1 logical routers or directly to one or more logical switches.
If you use Manager mode to modify objects created in the Policy mode, some settings might not be configurable. These read-only settings have this icon next to them: . See NSX Manager for more information.