With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cItpXuaAspDUNAsRcvd
Cisco IP Transfer Point Xua Asp DUN As Received
1.3.6.1.4.1.9.9.253.1.7.1.1.16
The number of Destination Unavailable messages received.
Back to CISCO-ITP-XUA-MIB MIB page.
IPHost Network monitor allows you to monitor cItpXuaAspDUNAsRcvd on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.