With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
appnDlciVcMaxSubnetPktSize
appn Dlci Vc Max Subnet Packet Size
This attribute indicates the maximum packet size allowed on the Vc.
Back to Nortel-Magellan-Passport-AppnMIB MIB page.
IPHost Network monitor allows you to monitor appnDlciVcMaxSubnetPktSize 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.