The SnapCenter Server can be installed on systems that are either in a domain or in workgroup. The user used for installation should have admin privileges on the machine in case of both workgroup and domain.
For installing SnapCenter Server and SnapCenter plug-ins on Windows hosts, you should use one of the following:
The Administration Guide contains more information about registering untrusted Active Directory domains.
Performing administrative tasks
While domain trusts, multi-domain forests, and cross-domain trusts are supported, cross-forest domains are not supported. The Microsoft documentation about Active Directory Domains and Trusts contains more information.
https://technet.microsoft.com/en-us/library/cc770299.aspx.