With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
traceRcvrFrDnaCugType
trace Receiver Fr Dna Cug Type
This attribute specifies the CUG type as either national or international. A national CUG has significance within the local network only. An international CUG has significance across network boundaries.
Back to Nortel-Magellan-Passport-FrTraceRcvrMIB MIB page.
IPHost Network monitor allows you to monitor traceRcvrFrDnaCugType 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.