With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
pnniRouteAddrIndex
pnni Route Address Index
1.3.6.1.4.1.353.5.4.1.1.19.4.1.3
An index into the set of listings of connectivity to a given address prefix from a given local node.
Back to PNNI-MIB MIB page.
IPHost Network monitor allows you to monitor pnniRouteAddrIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.