The communication flow is between the agents on the ESXi hypervisor to/from the Controllers and Manager via the management interface.
This document details the agents:
This KB details the port requirements for NSX:
VTEPs communicate only with other VTEPs. The concept of the data plane include more than just the VTEPs. The design guide provides greater detail on that topic as well.
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I'd use NSX-v 6.3.x - Security Configuration Guide (Published version 2.1) as the definitive reference for the NSX ports.
The KB 2079386 has some missing, and some unexpected extras (e.g., TCP/8672 - Controllers never connect to hosts, especially to vsfwd, referred to in the KB as the "User World Agent").