With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
trmLkMaxTxUnit
trm Lk Max Tx Unit
This attribute indicates the maximum data unit in bytes of this link. It represents the maximum frame length (including user data and routing headers) that can be sent on the link.
Back to Nortel-Magellan-Passport-BaseRoutingMIB MIB page.
IPHost Network monitor allows you to monitor trmLkMaxTxUnit 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 secure routers right now.