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Private VLAN (PVLAN)
The private VLAN (PVLAN) feature of the Dell Networking operating software is supported on the S4820T
platforms.
Private VLANs extend the Dell Networking OS security suite by providing Layer 2 isolation between ports
within the same private VLAN. A private VLAN partitions a traditional VLAN into subdomains identified by a
primary and secondary VLAN pair. The Dell Networking OS private VLAN implementation is based on RFC
3069.
For more information, refer to the following commands. The command output is augmented in Dell
Networking OS version 7.8.1.0 at later to provide PVLAN data:
• show arp
• show vlan
Private VLAN Concepts
Primary VLAN:
The primary VLAN is the base VLAN and can have multiple secondary VLANs. There are two types of
secondary VLAN — community VLAN and isolated VLAN:
• A primary VLAN can have any number of community VLANs and isolated VLANs.
• Private VLANs block all traffic to isolated ports except traffic from promiscuous ports. Traffic received
from an isolated port is forwarded only to promiscuous ports or trunk ports.
Community VLAN:
A community VLAN is a secondary VLAN of the primary VLAN:
• Ports in a community VLAN can talk to each other. Also, all ports in a community VLAN can talk to all
promiscuous ports in the primary VLAN and vice versa.
• Devices on a community VLAN can communicate with each other using member ports, while devices
in an isolated VLAN cannot.
Isolated VLAN:
An isolated VLAN is a secondary VLAN of the primary VLAN:
• Ports in an isolated VLAN cannot talk to each other. Servers would be mostly connected to isolated
VLAN ports.
• Isolated ports can talk to promiscuous ports in the primary VLAN, and vice versa.
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Private VLAN (PVLAN)