VMware NSX is network virtualization technology. VMware NSX is no longer sold as a standalone product and is now available as a part of VMware Cloud Foundation.
Our high-security environments require end to end encryption, but also tend to have larger budgets. Since beginning utilization of VMware NSX, we've been able to meet the unique requirements for our high-security clients, but it does have a large price tag that goes along with it. This isn't a particularly well-suited solution for environments with tighter budgets, but it definitely provides security where we need it and are willing to pay for this solution
Broadcast Suppression: By suppressing broadcast traffic, we have been able to deploy a single VDI network in a /18 network space, allowing for rapid growth and proper DHCP lease timing for a VDI instant clone environment.
Networking HA: Leveraging internal mechanisms for high availability, it provides disaster resiliency to a virtual networking environment.
Cost Savings: All available features of NSX are licensed simultaneously. Load balancers, firewalls, and routers are all licensed as features, not per object, allowing for the deployment of as many of these objects as are needed.
We use both Cisco ACI and VMware NSX, and while they have different strengths and capabilities, I would recommend VMware NSX, as it can be used in all VMware environments, without costly physical infrastructure changes. Cisco ACI provides some of the same capabilities, but not all. It's focus relies on physical networking changes.