With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
modNodePrefixesIndex
mod Node Prefixes Index
This variable represents the modNodePrefixesTable specific index for the modNodePrefixesTable.
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IPHost Network monitor allows you to monitor modNodePrefixesIndex 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.