TheVCF 9.0 Convergence and Migration Guideoutlines prerequisites and unsupported configurations when moving from a standalone vSphere deployment into VCF-managed workload domains.

Enhanced Linked Mode (ELM) must be removed:VCF does not support multiple vCenters joined in Enhanced Linked Mode. Each workload domain has its own dedicated vCenter instance, managed by SDDC Manager. The documentation states:“Before convergence, Enhanced Linked Mode must be deactivated. VCF requires independent vCenters for each workload domain.”

Lifecycle Manager must use Images only:VCF lifecycle operations are exclusively image-based. Baselines are not supported.“All clusters managed by VCF must be converted to vSphere Lifecycle Manager image-based lifecycle management prior to convergence.”

Other options are not required:

25 Gbps uplinks (A) are recommended for high throughput but not mandatory; 10 Gbps uplinks are supported.

An additional vMotion VMkernel (C) is not required by default, as standard vMotion networking is included in convergence designs.

vSphere Standard Switches (D) are not supported; VCF requires Distributed Switches, and existing vDS configurations can be adapted.

Therefore, the two configurations that must change are:Deactivate Enhanced Linked Mode (B)andswitch Lifecycle Manager to Images only (E).