With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
rtgVnsTotalRxDiscPkts
rtg Vns Total Rx Disc Packets
1.3.6.1.4.1.562.2.4.1.40.3.16.1.15
This attribute gives the total count of packets received and discarded by this Vns component. (For example, a received VNS packet may be discarded if its Time-to-Live counter has expired.) Packets counted here are not counted in totalRxPkts. The counter wraps around to zero when the maximum value is reached.
Back to Nortel-Magellan-Passport-VnsMIB MIB page.
IPHost Network monitor allows you to monitor rtgVnsTotalRxDiscPkts 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.