Netgear M4100-50G (GSM7248v2h2) - 46‐port GE + 4 GE Combo L2 Managed Switch Guía De Administador

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d.  Click Apply. 

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The Private VLANs feature separates a regular VLAN domain into two or more sub domains. 
Each sub domain is defined (represented) by a primary VLAN and a secondary VLAN. The 
primary VLAN ID is the same for all sub domains that belong to a private VLAN. The 
secondary VLAN ID differentiates sub domains from each other and provides Layer 2 
isolation between ports of the same private VLAN. 

There are three types of VLAN within a private VLAN:

Primary VLAN. Forwards the traffic from the promiscuous ports to isolated ports, 
community ports, and other promiscuous ports in the same private VLAN. Only one 
primary VLAN can be configured per private VLAN. All ports within a private VLAN 
share the same primary VLAN.

Community VLAN. A secondary VLAN that forwards traffic between ports which 
belong to the same community and to the promiscuous ports. There can be multiple 
community VLANs per private VLAN.

Isolated VLAN. A secondary VLAN that carries traffic from isolated ports to 
promiscuous ports. Only one isolated VLAN can be configured per private VLAN.