With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cntpSysPoll
cntp Sys Poll
1.3.6.1.4.1.9.9.168.1.1.8
The interval at which the NTP server polls other NTP servers to synchronize its clock.
Back to CISCO-NTP-MIB MIB page.
IPHost Network monitor allows you to monitor cntpSysPoll on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.