With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
btdsLCoCostMetric
btds L Co Cost Metric
This attribute gives the route's total cost metric. It is calculated as the sum of the cost metric of all trunks in the path at the time the connection was established. The cost metric of a trunk is defined by the trunkCost attribute of the Trunk component. The costMetric for an LCo that is originated and terminated on the same module is 0.
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IPHost Network monitor allows you to monitor btdsLCoCostMetric 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.