With IPHost Network Monitor you can run simple snmp requests against a F5 Network device in your network.
lbRouterVServAliveTime
lb Router V Serv Alive Time
1.3.6.1.4.1.3375.1.2.1.1.3.4.1.8
When the virtual server was last known to be up.
Back to F5-3DNS-MIB MIB page.
IPHost Network monitor allows you to monitor lbRouterVServAliveTime 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 routers right now.