With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrIpMcastDomainProtocolActive
Virtual Router Ip Mcast Domain Protocol Active
This attribute indicates the multicast protocol active in this domain.
Back to Nortel-Magellan-Passport-IpMIB MIB page.
IPHost Network monitor allows you to monitor vrIpMcastDomainProtocolActive 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 speech servers right now.