With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frNniLastUnknownDlci
Frame Relay Nni Last Unknown Dlci
This attribute identifies the most recent DLCI which user frames were received on for which a DLCI has not been provisioned on the port.
Back to Nortel-Magellan-Passport-FrameRelayNniMIB MIB page.
IPHost Network monitor allows you to monitor frNniLastUnknownDlci on Allied Telesis device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Nortel multiplexers right now.