With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdpInterfaceTable
Cisco Discovery Protocol Interface Table
1.3.6.1.4.1.9.9.23.1.1.1
The (conceptual) table containing the status of CDP on the device's interfaces.
Back to CISCO-CDP-MIB MIB page.
IPHost Network monitor allows you to monitor cdpInterfaceTable 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.