With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cntpPeersDispersion
cntp Peers Dispersion
1.3.6.1.4.1.9.9.168.1.2.1.1.25
The estimated maximum error of the peer clock relative to the local clock over the network path between them, in seconds. The host determines the value of this object using the NTP clock-filter algorithm.
Back to CISCO-NTP-MIB MIB page.
IPHost Network monitor allows you to monitor cntpPeersDispersion on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.