With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cagwDhcpUnknownPackets
Cisco's ASN Gateway Dhcp Unknown Packets
1.3.6.1.4.1.9.9.638.1.3.2.1.1.10
The number of DHCP Unknown packets processed by the DHCP relay in the ASN-GW.
Back to CISCO-ASN-GATEWAY-MIB MIB page.
IPHost Network monitor allows you to monitor cagwDhcpUnknownPackets on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.