Working with VM replication sets (Windows) : VMware vSphere snapshot replication sets : Creating a VMware vSphere snapshot replication set : Specifying the source server
 
Specifying the source server
1. In the Select the computer page, select VM Replication and ensure that Ask for Network Credentials is selected.
2. In the Path box, type the IP address of the source vCenter Server and then click Next.
The source DS-Client (which is the DS-Client you are using to create this VM replication set) will request the source vCenter Server to create a snapshot for each virtual machine being replicated. The VM replication data will flow from the source vCenter Server through the source DS-Client. No data is sent to DS-System.
3. When prompted, type the credentials that are needed to access the source vCenter Server. For important recommendations, see “Credentials for the source and destination servers:”.
F1 Help: "Specify Credentials (Windows DS-Client)"