With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrIpArpHostMaxTxUnit
Virtual Router Ip Arp Host Max Tx Unit
Specify the maximum transmit unit (MTU) size that can be accepted by the host. If this value is not specified, the value for the media interface is used. The specified MTU must be less than or equal to the interface's MTU size.
Back to Nortel-Magellan-Passport-IpMIB MIB page.
IPHost Network monitor allows you to monitor vrIpArpHostMaxTxUnit 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.