With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cPtpClockInstanceIndex
Cisco Ptp Clock Instance Index
1.3.6.1.4.1.9.9.760.1.1.3.1.3
This object specifies the instance of the Clock for this clock type for the given domain.
Back to CISCO-PTP-MIB MIB page.
IPHost Network monitor allows you to monitor cPtpClockInstanceIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.