With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
gvcIfDnaSdmDeviceUnreachable
General Vc Interface Dna Sdm Device Unreachable
This attribute counts the number of times the deviceStatus changed from reachable to unreachable. When the maximum count is exceeded the count wraps to zero.
Back to Nortel-Magellan-Passport-GeneralVcInterfaceMIB MIB page.
IPHost Network monitor allows you to monitor gvcIfDnaSdmDeviceUnreachable 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.