With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
gvcIfDnaDdmMac
General Vc Interface Dna Ddm Mac
This attribute specifies a locally or globally administered MAC address of a LAN device.
Back to Nortel-Magellan-Passport-GeneralVcInterfaceMIB MIB page.
IPHost Network monitor allows you to monitor gvcIfDnaDdmMac 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.