With IPHost Network Monitor you can run simple snmp requests against a F5 Network device in your network.
globalPersistLDns
global Persist L Dns
1.3.6.1.4.1.3375.1.2.1.1.1.34
If TRUE (default), then 3DNS will remember all LDNS's that make requests in its cache. This must be TRUE in order to store and use path information.
Back to F5-3DNS-MIB MIB page.
IPHost Network monitor allows you to monitor globalPersistLDns 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 ADC chassis right now.