With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cwaPrefRouteNwElemPortId
cwa Pref Route Nw Elem Port Id
1.3.6.1.4.1.9.9.99996.1.2.1.3
The 32-bit logical port identifier of an egress port on the associated PNNI node for the network element.
Back to CISCO-WAN-ATM-PREF-ROUTE-MIB MIB page.
IPHost Network monitor allows you to monitor cwaPrefRouteNwElemPortId 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.