7.1.6 Design Implications
Use single sign-on (SSO) to provide a common service, both internally and externally.

Single
sign-on (SSO) can be combined with the use of smart cards or Common Access Cards (CACs) for initial authentication to a directory service.

You must
use a supported Identity Provider (IdP):
Identity sources: OpenAM, Active Directory Federation Services, Shibboleth.
Deployment models: Single mode (
one node), HA mode (
multiple nodes), Replication mode.

Use a high availability architecture to provide a
highly available single sign-on
(SSO) service.
Deploying vCenter Single Sign-On as a cluster means that two or more instances of vCenter Single Sign- On are installed in high availability (HA) mode. vCenter Single Sign-On HA mode is not the same as vSphere HA. All instances of vCenter Single Sign-On use the same database and should point to the same identity sources. Single Sign-On administrator users, when connected to vCenter Server through the vSphere Web Client, see the primary Single Sign-On instance. In this deployment scenario, the installation process grants admin@System-Domain vCenter Server privileges by default. In addition, the installation process creates the user admin@System-Domain to manage vCenter Single Sign-On.