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44 | Chapter 2. VLANs

ProSafe M4100 and M7100 Managed Switches

Private VLANs

The Private VLANs feature separates a regular VLAN domain into two or more subdomains.

Each subdomain is defined (represented) by a primary VLAN and a secondary VLAN. The

primary VLAN ID is the same for all subdomains that belong to a private VLAN. The

secondary VLAN ID differentiates subdomains 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 - it forwards the traf

fic 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 - is a secondary VLAN. It forwards traf

fic between ports which

belong to the same community and to the promiscuous ports. There can be multiple

community VLANs per private VLAN.

• Isolated VLAN - is a secondary VLAN. It carries traf

fic from isolated ports to

promiscuous ports. Only one isolated VLAN can be configured per private VLAN.

There are three types of port designation within a private VLAN:

• Promiscuous port - belongs to a primary VLAN and can communicate with all

interfaces in the private VLAN, including other promiscuous ports, community ports,

and isolated ports.

• Community ports -

These ports can communicate with other community ports and

promiscuous ports.

• Isolated ports -

These can ONLY communicate with promiscuous ports.

The Private VLANs can be extended across multiple switches through inter-switch/stack links

that transport primary

, community, and isolated VLANs between devices. See figure 1.

Figure 4. Private VLANs

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