What is MUX VLAN on S series switch

On S series switches (except S1700), Multiplex VLAN (MUX VLAN) provides a mechanism that controls network resources through VLANs.
The MUX VLAN involves a principal VLAN and multiple subordinate VLANs. Subordinate VLANs are classified into group VLANs and separate VLANs. Member interfaces in subordinate VLANs can communicate with interfaces in the principal VLAN but cannot communicate with each other. Interfaces in a subordinate group VLAN can communicate with each other, but interfaces in a subordinate separate VLAN are isolated from each other.

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