With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
Cisco Discovery Protocol Ct Address Table
The (conceptual) table containing the list of network-layer addresses of a neighbor interface, as reported in the Address TLV of the most recently received CDP message. The first address included in the Address TLV is saved in cdpCacheAddress. This table contains the remainder of the addresses in the Address TLV.
Back to CISCO-CDP-MIB MIB page.
IPHost Network monitor allows you to monitor cdpCtAddressTable on Cisco device via the SNMP protocol.
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Easy monitoring of cdpCtAddressTable with IPHost tools