With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
appnMaximumDirectorySize
appn Maximum Directory Size
This attribute contains the maximum number of SnaDirectoryEntry components that can be defined or learned by this node. A value of zero means unlimited.
Back to Nortel-Magellan-Passport-AppnMIB MIB page.
IPHost Network monitor allows you to monitor appnMaximumDirectorySize 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.