With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cntpPeersReceiveTime
cntp Peers Receive Time
1.3.6.1.4.1.9.9.168.1.2.1.1.18
The local time, when the latest NTP message from the peer arrived. If the peer becomes unreachable the value is set to zero.
Back to CISCO-NTP-MIB MIB page.
IPHost Network monitor allows you to monitor cntpPeersReceiveTime on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.