With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteCugIndex
x25 Dte Cug Index
1.3.6.1.4.1.562.2.4.1.90.23.1.10
This attribute specifies the index of the Closed User Group facility to signal. The index consists of two or four octets each representing a digit in the range of 0 to 9. A value of null (empty string) at the X.25 interface means no CUG facility is signalled. If a cugIndex is provisioned to be signalled, the cugoaIndex attribute must be null.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteCugIndex 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.