With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
lecMaxFrameSize
LAN Emulation Client Max Frame Size
This attribute specifies the maximum data frame size for this LEC. Auto-configuring LECs use this attribute in their Configure requests. Manually-configured LECs use it in their Join requests. A value of unspecified may only be used for auto-configuring LECs. A value of 1580 may only be specified for a LEC that has the v2Capable attribute set to yes.
Back to Nortel-Magellan-Passport-LaneClientMIB MIB page.
IPHost Network monitor allows you to monitor lecMaxFrameSize 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.