Which Container Network Interface (CNI) is selected by default in a VMware Kubernetes Service (VKS)...

The VCF 9.0 Kubernetes Service documentation confirms that Antrea is the default CNI used for VMware Kubernetes Service (VKS) workload clusters.

“When deploying a new VKS workload cluster, the Antrea Container Networking Interface is automatically enabled by default to provide pod-to-pod and pod-to-service networking. Antrea is fully integrated with NSX-T for advanced policy control.”

Flannel, Calico, and Cilium are widely used CNIs in upstream Kubernetes but are not the default in VCF. Administrators can optionally integrate with third-party CNIs, but the supported default choice is Antrea.