In an NSX environment, a Punting Traffic Group for the NSX Edge uplinks must be configured before enabling stateful active-active Source NAT (SNAT). This configuration ensures that traffic is appropriately handled and forwarded between the NSX Edge nodes in an active-active setup, allowing stateful connections to be maintained across multiple Edge nodes.

The NSX Edge supports L2 VPN (Layer 2 VPN) functionality, which allows it to connect different Layer 2 networks over an IP transport.
Third-party hardware VPN devices can also be used as L2 VPN clients, providing connectivity between different Layer 2 networks through an external device.

NSX Intelligence provides a visual overview of network connections within the NSX domain, allowing administrators to see the traffic flows between different VMs and networks. It offers detailed visibility into network traffic patterns, application dependencies, and security posture, making it a valuable tool for monitoring and troubleshooting within NSX environments.

https://docs.vmware.com/en/VMware-NSX-T-Data-Center/3.2/administration/GUID-0A8BF7D8-9C2E-48A5-8219-17C00F1EC13A.html

The RouterLink port between a Tier-1 Gateway and a Tier-0 Gateway is automatically created when the Tier-1 Gateway is connected to the Tier-0 Gateway through the NSX UI. This link enables routing between the Tier-1 and Tier-0 gateways without the need for manual configuration of segments or logical switches.