With IPHost Network Monitor you can run simple snmp requests against a Huawei device in your network.
dot1sInstanceVlanMapped3k
dot1s Instance Vlan Mapped3k
1.3.6.1.4.1.207.1.4.167.118.1.5.1.8
A string of octets containing one bit per VLAN for VLANS with VlanIndex values 2048 through 3071. The first octet corresponds to VLANs with VlanIndex values of 2048 through 2055; the second octet to VLANs 2056 through 2063 etc. The most significant bit of each octet corresponds to the lowest VlanIndex value in that octet. For each VLAN that is mapped to this MSTP instance, the bit corresponding to that VLAN is set to '1'. This object is only instantiated on devices with support for VlanIndex values up to 4095.
Back to AT-GS950-16-MIB MIB page.
IPHost Network monitor allows you to monitor dot1sInstanceVlanMapped3k 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.