With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cipIcmpInDestUnreachs
Cisco Channel Interface Processor Icmp In Destination Unreachs
1.3.6.1.4.1.9.9.32.1.3.1.1.3
The number of ICMP Destination Unreachable messages received.
Back to CISCO-CIPTCPIP-MIB MIB page.
IPHost Network monitor allows you to monitor cipIcmpInDestUnreachs on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.