Unified control plane for nested clusters in a virtualized computing infrastructure

Techniques are disclosed for a unified control plane in a nested cluster environment. In one example, an underlay orchestrator for a virtualized computing infrastructure is configured to provision, in an underlay cluster of one or more servers, an overlay cluster of one or more overlay nodes. Each of the overlay nodes is a workload of one of the servers and has a virtual network interface. Further, each server executes a virtual router and a virtual router agent for the virtual router for routing packets among virtual network interfaces of the overlay nodes executed by the server. A network controller is configured to configure virtual network sub-interfaces for workloads of the overlay nodes to enable communications among workloads executing in different overlay nodes. Each of the sub-interfaces is a virtual network sub-interface of one of the virtual network interfaces.