You can use the vSphere Client or the vSphere API to add a cluster of KMS instances to the vCenter Server system. If you use multiple KMS instances in a cluster, all instances must be from the same vendor and must replicate keys.

If your environment uses different KMS vendors in different environments, you can add a KMS cluster for each KMS and specify a default KMS cluster. The first cluster that you add becomes the default cluster. You can explicitly change the default later.

As a KMS client, vCenter Server uses the Key Management Interoperability Protocol (KMIP) and makes it easy to use the KMS of your choice.