With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cipUdpInErrors
Cisco Channel Interface Processor Udp In Errors
1.3.6.1.4.1.9.9.32.1.4.1.1.3
The number of received UDP datagrams that could not be delivered for reasons other than the lack of an application at the destination port.
Back to CISCO-CIPTCPIP-MIB MIB page.
IPHost Network monitor allows you to monitor cipUdpInErrors 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.