Fusion supports Interset within the same cluster. As an administrator, you do not have to perform any additional configurations in Fusion to integrate data from Interset.
Interset users automatically have single sign-on access as long as the first administrative account for Fusion matches the credentials for the Interset administrator, which is the administrative account that was specified during the deployment of Interset. Users with Dashboard permissions automatically receive the Default Tenant status in Interset. These users can view content in widgets that display data from Interset. The User Guide for ArcSight Fusion, available as context-sensitive help within Fusion, indicates whether a widget needs data from a specific data source.