With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cDhcpv4ServerNotifyClientOrServerDetected
Cisco Dynamic Host Configuration protocol Server Notify Client Or Server Detected
1.3.6.1.4.1.9.10.102.1.7.3
Duplicate IPv4 addresses can be detected either by a server, using an ICMP ECHO message, or by a client using ARP. This object is set by the server to (1) if the client used DHCPDECLINE to mark the offered address as in-use, or to (2) if the server discovered the address in use by some client before offering it.
Back to CISCO-IETF-DHCP-SERVER-MIB MIB page.
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