With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
pnniRouteAddrOperStatus
pnni Route Address Operational Status
1.3.6.1.4.1.353.5.4.1.1.19.4.1.15
Indicates whether the reachable address prefix is operationally valid and whether it is being advertised by this node.
Back to PNNI-MIB MIB page.
IPHost Network monitor allows you to monitor pnniRouteAddrOperStatus on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.