With IPHost Network Monitor you can run simple snmp requests against a Huawei device in your network.
ifSecondaryIpSubnetMask
if Secondary Ip Subnet Mask
1.3.6.1.4.1.207.1.4.167.27.1.11.1.2
Specifies the IP Subnet Mask associted with the secondary ip address configuration. The value should be specified only for network interfaces and any valid VLSM is accsysted. If not specified, this object takes the default subnet mask value based on the class of the IP address configured for the interface.
Back to AT-GS950-24-MIB MIB page.
IPHost Network monitor allows you to monitor ifSecondaryIpSubnetMask 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 routers right now.