Both NSX-V and NSX-T are software based network virtualization platforms which supports network functions to be decoupled from physical network and brought networking and security functions on to software layer.
Where NSX-V is old platform from VMware which is already announced as End of Life in 2022 and NSX-T is successor for NSX-V. In early days NSX-T did not have feature parity with NSX-V. but now NSX-T has surpassed NSX-V in terms of its features and integrations. NSX-T supports many modern day use cases
NSX-V vs NSX-T Feature Difference:
| NSX-V | NSX-T | |
| Life Cycle | Old (Deprecated) | New (NSX-T is successor to NSX-V) |
| Manager & Controller | One NSX Manager(Single point of failure) and three node controller cluster | NSX management and control planes are integrated into 3 node NSX appliance cluster |
| Routers Employed | DL (Distributed Logical Router) & ESG (Edge Services Gateway) | Tier 0 & Tier1 |
| A two-tier distributed routing | No | Yes |
| Routing Between NSX Routers | Routing between DLR and ESG is manual | Routing between Tier 0 and Tier 1 is auto plumbed |
| Configuring the IP addressing scheme for network segments | Manual | Automatic (between Tier 0 and Tier 1) |
| Tight integration with vSphere | Yes | No |
| Working without vCenter | No | Yes |
| Support for multiple vCenter instances by NSX Manager | No | Yes |
| Provides virtual networking for the following virtualization platforms | VMware ESXi | VMware vSphere, KVM, Docker, Kubernetes, OpenStack, AWS native workloads |
| NSX Edge deployment | ESXi VM | ESXi VM or physical server |
| Overlay Technology | VXLAN | GENEVE |
| Virtual switches used | vSphere Distributed Switch (VDS) | VDS or Open vSwitch (OVS) or N-VDS |
| Logical switch replication modes | Unicast, Multicast, Hybrid | Unicast (Two-tier or Head) |
| Minimum required MTU | 1600 | 1700 |
| Transport Zones | Only one type of Transport Zone | Two types of transport zones. Overlay Transport Zone and VLAN Transport Zone |
| ARP suppression | Yes | Yes |
| Integration for traffic inspection | Yes | No |
| Kubernetes Support | No | Yes |
| Kernel-level distributed firewall | Yes | Yes |
You can migrate to NSX-T using migration coordinator tool which is built into NSX-T