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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Private VLAN Concepts

Review the following PVLAN concepts before you create PVLANs on your system.

The VLAN types in a PVLAN include:
  • Community VLAN — a type of secondary VLAN in a primary VLAN:
    • Ports in a community VLAN can communicate with each other.
    • Ports in a community VLAN can communicate with all promiscuous ports in the primary VLAN.
    • A community VLAN can only contain ports configured as host.
  • Isolated VLAN — a type of secondary VLAN in a primary VLAN:
    • Ports in an isolated VLAN cannot talk directly to each other.
    • Ports in an isolated VLAN can only communicate with promiscuous ports in the primary VLAN.
    • An isolated VLAN can only contain ports configured as host.
  • Primary VLAN — the base VLAN of a PVLAN:
    • A switch can have one or more primary VLANs, and it can have none.
    • A primary VLAN has one or more secondary VLANs.
    • A primary VLAN and each of its secondary VLANs decrement the available number of VLAN IDs in the switch.
    • A primary VLAN has one or more promiscuous ports.
    • A primary VLAN might have one or more trunk ports, or none.
  • Secondary VLAN — a subdomain of the primary VLAN.
    • There are two types of secondary VLAN — community VLAN and isolated VLAN.
PVLAN port types include:
  • Community port — a port that belongs to a community VLAN and is allowed to communicate with other ports in the same community VLAN and with promiscuous ports.
  • Host port — in the context of a private VLAN, is a port in a secondary VLAN:
    • The port must first be assigned that role in INTERFACE mode.
    • A port assigned the host role cannot be added to a regular VLAN.
  • Isolated port — a port that, in Layer 2, can only communicate with promiscuous ports that are in the same PVLAN.
  • Promiscuous port — a port that is allowed to communicate with any other port type in the PVLAN:
    • A promiscuous port can be part of more than one primary VLAN.
    • A promiscuous port cannot be added to a regular VLAN.
  • Trunk port — carries traffic between switches:
    • A trunk port in a PVLAN is always tagged.
    • In tagged mode, the trunk port carries the primary or secondary VLAN traffic. The tag on the packet helps identify the VLAN to which the packet belongs.
    • A trunk port can also belong to a regular VLAN (non-private VLAN).

Each of the port types can be any type of physical Ethernet port, including port channels (LAGs). For more information about port channels, refer to Port Channel Interfaces in the Interfaces chapter.

For an introduction to VLANs, refer to Layer 2.

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