VMware NSX-v network virtualization solution addresses current challenges with physical network infrastructure and brings flexibility, agility and scale through VXLAN-based logical networks.
Along with the ability to create on-demand logical networks using VXLAN, the NSX Edge Services Gateway helps users deploy various logical network services such as firewall, DHCP, NAT and load balancing on these networks.
This is possible due to its ability to decouple the virtual network from the physical network and then reproduce the properties and services in the virtual environment.
In brownfield environments NSX can provide programmatic connectivity via L2 bridging or L3 routing and service insertion of existing physical services such as Load-Balancers and Firewalls, so such legacy services can be integrated and consumed by NSX Logical Networks.
As described in this document, in such brownfield environments NSX functionality can be incrementally introduced to meet different customer requirements and use-cases.