With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cItpXuaAspDUPUsSent
Cisco IP Transfer Point Xua Asp DUP Us Sent
1.3.6.1.4.1.9.9.253.1.7.1.1.21
The number of Destination User Part Unavailable messages sent.
Back to CISCO-ITP-XUA-MIB MIB page.
IPHost Network monitor allows you to monitor cItpXuaAspDUPUsSent on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.