The second subsystem of NSX Routing is provided by Edge Services Gateway.
The ESG is essentially a router in a virtual machine. It is delivered in an appliance-like form factor with four sizes, with its complete lifecycle managed by the NSX Manager. The ESG’s primary use case is as a perimeter router, where it is deployed between multiple DLRs and between the physical world and the virtualized network.
The ESG has the following properties:
Each ESG can have up to 10 vNIC interfaces, or 200 trunk sub-interfaces.
Each ESG supports 8-way ECMP for path redundancy and scalability.