Quick post on SCCM 2012 SSRS report list all Site servers with its boundary information.

More Information,refer http://eskonr.com/2013/12/sccm-2012-ssrs-report-site-servers-and-its-assigned-boundary-information/

download the .rdl file and upload to cm12 reports.

If you want to know more about SCCM 2012 SQL views while creating report,refer http://gallery.technet.microsoft.com/SCCM-Configmgr-2012-R2-SQL-5fefdd3b