With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
btdsPlcDiscardPriority
btds Plc Discard Priority
This attribute indicates the importance of the packets on the path. One is used for paths carrying the most important traffic, and three is used for paths carrying the least important traffic. Packets with lower discardPriority(numerically lower) are discarded after packets with a higher discardPriority(numerically higher).
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IPHost Network monitor allows you to monitor btdsPlcDiscardPriority 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 switches right now.