With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cntpPeersVarTable
cntp Peers Var Table
1.3.6.1.4.1.9.9.168.1.2.1
This table provides information on the peers with which the local NTP server has associations. The peers are also NTP servers but running on different hosts.
Back to CISCO-NTP-MIB MIB page.
IPHost Network monitor allows you to monitor cntpPeersVarTable 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.