With IPHost Network Monitor you can run simple snmp requests against a Huawei device in your network.
lldpXdot3RemMaxFrameSize
lldp Xdot3 Remote Max Frame Size
1.0.8802.1.1.2.1.5.4623.1.3.4.1.1
An integer value indicating the maximum supported frame size in octets on the port component associated with the remote system.
Back to IEEE8021-PAE-MIB MIB page.
IPHost Network monitor allows you to monitor lldpXdot3RemMaxFrameSize on Allied Telesis device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Allied Telesis firewalls right now.