With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrIpRdbAge
Virtual Router Ip Rdb Age
This attribute specifies the number of seconds since this route was last updated or otherwise determined to be correct.
Back to Nortel-Magellan-Passport-IpMIB MIB page.
IPHost Network monitor allows you to monitor vrIpRdbAge 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.