With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frNniFramerUnderruns
Frame Relay Nni Framer Underruns
This attribute is the total number of frames transmitted to the link for which underruns occurred.
Back to Nortel-Magellan-Passport-FrameRelayNniMIB MIB page.
IPHost Network monitor allows you to monitor frNniFramerUnderruns 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 secure routers right now.