What QinQ represent

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QinQ is a tunel protocol based on 802.1Q. It encapsulates public network VLAN tagging besides private network VLAN tagging

Other related questions:
What are QinQ and selective QinQ
Switch QinQ is also called port QinQ or Dot1q-tunnel. The port adds the default VLAN tag to packets no matter whether the packets carry VLAN tags. Selective QinQ indicates VLAN stacking. Different from port QinQ, selective QinQ encapsulates outer VLAN tags according to different VLANs.

What ERPS represent
ERPS is a protocol defined by the International Telecommunication Union - Telecommunication Standardization Sector (ITU-T) to eliminate loops at Layer 2. Because the standard number is ITU-T G.8032/Y1344, ERPS is also called G.8032. ERPS defines Ring Auto Protection Switching (RAPS) Protocol Data Units (PDUs) and protection switching mechanisms

What LPU represents?
The Line Processing Unit (LPU) provides the physical interfaces to the outside world (Ethernet/POS) and connects to the Switch Fabric Unit (SFU).

What a mVLAN represent
Management VLAN (mVLAN) configuration allows users to use the VLANIF interface of the mVLAN to log in to the management switch to manage devices in a centralized manner

What VBST represent
VBST, a Huawei spanning tree protocol, constructs a spanning tree in each VLAN so that traffic from different VLANs is forwarded through different spanning trees. VBST is equivalent to STP or RSTP running in each VLAN. Spanning trees in different VLANs are independent of each other

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