With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
pnniDTLIndex
pnni DTL Index
1.3.6.1.4.1.353.5.4.1.1.19.3.1.1
The index in the node's DTL table of this DTL stack.
Back to PNNI-MIB MIB page.
IPHost Network monitor allows you to monitor pnniDTLIndex 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.