With IPHost Network Monitor you can run simple snmp requests against a F5 Network device in your network.
lbRouterVServCount
lb Router V Serv Count
1.3.6.1.4.1.3375.1.2.1.1.3.1.1.3
The number of virtual servers associated with the load-balancing router.
Back to F5-3DNS-MIB MIB page.
IPHost Network monitor allows you to monitor lbRouterVServCount on F5 Network device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring F5 Network switches right now.