With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
pnniRouteTnsTable
pnni Route Tns Table
1.3.6.1.4.1.353.5.4.1.1.19.5
A table containing all the attributes necessary to determine what transit networks the PNNI entity believes are reachable and to determine which nodes are advertising this reachability. This table is also used to add static routes to reachable transit networks. The local node index which received the reachability information, type of network identification, network identification plan, transit network identifier, and an index that distinguishes between multiple listings of connectivity to a given transit network from a given local node are combined to form an instance ID for this object.
Back to PNNI-MIB MIB page.
IPHost Network monitor allows you to monitor pnniRouteTnsTable 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.