With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrIpxInDiscards
Virtual Router Ipx In Discards
Number of packets received but discarded due to reasons other than those accounted for by inHeaderErrors and inUnknownSocket. This counter wraps around to zero after reaching the maximum value of 4294967295.
Back to Nortel-Magellan-Passport-IpxMIB MIB page.
IPHost Network monitor allows you to monitor vrIpxInDiscards 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.