With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
mpanlDlciLbRemoteTotalBytes
mpanl Dlci Lb Remote Total Bytes
This attribute records the number of bytes looped back to the subnet since loopback was last started.
Back to Nortel-Magellan-Passport-MpaNetworkLinkMIB MIB page.
IPHost Network monitor allows you to monitor mpanlDlciLbRemoteTotalBytes 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.