With IPHost Network Monitor you can run simple snmp requests against a F5 Network device in your network.
lbDomainPersistTTL
lb Domain Persist TTL
1.3.6.1.4.1.3375.1.2.1.1.6.1.1.20
The duration that the domain will maintain connections between LDNS's and virtual servers.
Back to F5-3DNS-MIB MIB page.
IPHost Network monitor allows you to monitor lbDomainPersistTTL 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.