When you create a downlink port on a tier-1 logical router, the port serves as a default gateway for the VMs that are in the same subnet.
Prerequisites
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Verify that a tier-1 logical router is configured. See Create a Tier-1 Logical Router in Manager Mode.
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Verify that Manager mode is selected in the NSX Manager user interface. See NSX Manager. If you do not see the Policy and Manager mode buttons, see Configure User Interface Settings.
Procedure
What to do next
Enable route advertisement to provide North-South connectivity between VMs and external physical networks or between different tier-1 logical routers that are connected to the same tier-0 logical router. See Configure Route Advertisement on a Tier-1 Logical Router in Manager Mode.