With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
pnniIfPortId
pnni If Port Id
1.3.6.1.4.1.353.5.4.1.1.8.1.2
The Port Identifier of the port as selected by the PNNI protocol entity for the given interface. This value has meaning only within the context of the node to which the port is attached. The distinguished value zero indicates that no PNNI Port Identifier has been assigned for this interface (for example, this value may be used when the interface is not running PNNI).
Back to PNNI-MIB MIB page.
IPHost Network monitor allows you to monitor pnniIfPortId 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.