The value of this object identifies the BPDU-VLAN-based communication with non-Huawei devices.
On non-Huawei devices, protocol packets are in the format of VBSTand a VLAN is a spanning tree.
Therefore, to communicate with non-Huawei devices, the format of BPDU packets on Huawei devices need to be set to VBST,
and Huawei devices need to belong to the same VLAN with non-Huawei devices.