With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrIpMcastFwdGAddrIndex
Virtual Router Ip Mcast Forward G Address Index
This variable represents an index for the vrIpMcastFwd tables.
Back to Nortel-Magellan-Passport-IpMIB MIB page.
IPHost Network monitor allows you to monitor vrIpMcastFwdGAddrIndex 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.