With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cPtpClockPortDSDomainIndex
Cisco Ptp Clock Port DS Domain Index
1.3.6.1.4.1.9.9.760.1.2.8.1.1
This object specifies the domain number used to create logical group of PTP devices.
Back to CISCO-PTP-MIB MIB page.
IPHost Network monitor allows you to monitor cPtpClockPortDSDomainIndex 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.