With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cntpSysPeer
cntp Sys Peer
1.3.6.1.4.1.9.9.168.1.1.9
The current synchronization source. This will contain the unique association identifier cntpPeersAssocId of the corresponding peer entry in the cntpPeersVarTable of the peer acting as the synchronization source. If there is no peer, the value will be 0.
Back to CISCO-NTP-MIB MIB page.
IPHost Network monitor allows you to monitor cntpSysPeer 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.