With IPHost Network Monitor you can run simple snmp requests against a Fortinet device in your network.
fgVdTpTable
fg Vd Tp Table
1.3.6.1.4.1.12356.101.3.2.2
A table of virtual domains in transparent operation mode. This table has a sparse dependent relationship with fgVdTable.
Back to FORTINET-FORTIGATE-MIB MIB page.
IPHost Network monitor allows you to monitor fgVdTpTable on Fortinet device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Fortinet firewalls right now.