With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrIpMcastFwdAge
Virtual Router Ip Mcast Forward Age
This attribute indicates the number of seconds since this route was last updated.
Back to Nortel-Magellan-Passport-IpMIB MIB page.
IPHost Network monitor allows you to monitor vrIpMcastFwdAge 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 modems right now.