With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
gvcIfDlciABitReasonFromNetwork
General Vc Interface Dlci A Bit Reason From Network
This attribute indicates the reason (if any) for an inactive status to be sent to the Protocol Port associated with this GvcIf. This reason is notapplicable for an active status.
Back to Nortel-Magellan-Passport-GeneralVcInterfaceMIB MIB page.
IPHost Network monitor allows you to monitor gvcIfDlciABitReasonFromNetwork 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.