With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrRowStatusEntry
Virtual Router Row Status Entry
1.3.6.1.4.1.562.2.4.1.100.1.1
A single entry in the table represents a single vr component.
Back to Nortel-Magellan-Passport-VirtualRouterMIB MIB page.
IPHost Network monitor allows you to monitor vrRowStatusEntry 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.