Compare VMware NSX-T to Illumio ASP
Distributed infrastructure, visibility constraints, and policy creation complexity can all impact the effectiveness of a segmentation solution. VMware NSX-T provides many capabilities, including network segmentation, a distributed firewall, load balancing, and cloud access. But if you are looking for a scalable micro-segmentation solution that is easy to manage across the data center, cloud, and containers, you hit certain limitations.
https://www.illumio.com/resource-center/guide-comparing-illumio-asp-and-vmware-nsx

Capabilities
Capabilities
Illumio ASP
VMware NSX-T
VISIBILITY
Auto-generated application dependency map
Auto-generated application dependency map for >100 workloads
Auto-generated application dependency map for managed cloud workloads
Auto-generated application dependency map for bare-metal and KVM workloads
Auto-generated vulnerability map
MICRO-SEGMENTATION
Whitelist “Zero Trust” policy model
Automatic policy generation
Automatic policy generation for cloud, bare-metal, and KVM workloads
Automatic policy generation for 1000s of workloads
Support for bare-metal servers
Managed workload support for AWS, Azure, GCP, Oracle Cloud
Mainstream OS support on hypervisors (Windows, Linux)
Encryption for data in motion between workloads
MANAGEMENT
Federation of management to support up 225k workloads
App-based SIEM integration
Integration of vulnerability data to provide vulnerability-based segmentation