With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrIpMcastPimNbrIfIndex
Virtual Router Ip Mcast Pim Neighbor If Index
This attribute indicates the value of ifIndex for the interface used to reach this PIM neighbor.
Back to Nortel-Magellan-Passport-IpMIB MIB page.
IPHost Network monitor allows you to monitor vrIpMcastPimNbrIfIndex 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.