With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdpCacheTable
Cisco Discovery Protocol Cache Table
1.3.6.1.4.1.9.9.23.1.2.1
The (conceptual) table containing the cached information obtained via receiving CDP messages.
Back to CISCO-CDP-MIB MIB page.
IPHost Network monitor allows you to monitor cdpCacheTable 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.