This design implements software-defined networking by using VMware NSX-T. By using NSX-T, virtualization delivers for networking what it has already delivered for compute and storage.
In much the same way that server virtualization programmatically creates, takes snapshots of, deletes, and restores software-based virtual machines (VMs), NSX network virtualization programmatically creates, takes snapshots of, deletes, and restores software-based virtual networks. As a result, you follow a simplified operational model for the underlying physical network.
NSX-T is a nondisruptive solution. You can deploy it on any IP network, including existing traditional networking models and next-generation fabric architectures, regardless of the vendor.
When administrators provision workloads, network management is a time-consuming task. You spend most time configuring individual components in the physical infrastructure and verifying that network changes do not affect other devices that are using the same physical network infrastructure.
The need to pre-provision and configure networks is a constraint to cloud deployments where speed, agility, and flexibility are critical requirements. Pre-provisioned physical networks enable fast creation of virtual networks and faster deployment times of workloads using the virtual network. If the physical network that you need is already available on the ESXi host to run a workload, pre-provisioning physical networks works well. However, if the network is not available on an ESXi host, you must find an ESXi host with the available network and allocate capacity to run workloads in your environment.
Decouple virtual networks from their physical counterparts. In the virtualized environment, you must recreate all physical networking attributes that are required by the workloads. Because network virtualization supports the creation of virtual networks without modification of the physical network infrastructure, you can provision the workload networks faster.