With IPHost Network Monitor you can run simple snmp requests against a F5 Network device in your network.
summaryLastSyncIn
summary Last Sync In
1.3.6.1.4.1.3375.1.2.1.1.7.11
The value of summaryUpTime when the most recent incoming sync was performed.
Back to F5-3DNS-MIB MIB page.
IPHost Network monitor allows you to monitor summaryLastSyncIn 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.