With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrIpxIndex
Virtual Router Ipx Index
This variable represents the index for the vrIpx tables.
Back to Nortel-Magellan-Passport-IpxMIB MIB page.
IPHost Network monitor allows you to monitor vrIpxIndex 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.