With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
rtgVnsMaximumTransmissionUnit
rtg Vns Maximum Transmission Unit
1.3.6.1.4.1.562.2.4.1.40.3.10.1.3
This is the maximum transmission unit (MTU), in bytes, supported by the VirtualNetworkingSystem. The MTU must be less than the minimum MTU provisioned on any trunk in the network that is supporting the LNN of this Vns component.
Back to Nortel-Magellan-Passport-VnsMIB MIB page.
IPHost Network monitor allows you to monitor rtgVnsMaximumTransmissionUnit 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.