With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
atmMpeMaxTransmissionUnit
atm Mpe Max Transmission Unit
This attribute sets the size of the largest datagram which can be sent on the interface. This includes the size of the Logical Link Control header (if applicable) as well as the protocol data unit.
Back to Nortel-Magellan-Passport-AtmMpeMIB MIB page.
IPHost Network monitor allows you to monitor atmMpeMaxTransmissionUnit 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.