Reference Guide

1156 | Private VLAN (PVLAN)
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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 via 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.
Port types:
• Community port: A community port is, by definition, 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.
• Isolated port: An isolated port is, by definition, a port that, in Layer 2, can only communicate
with promiscuous ports that are in the same PVLAN.
• Promiscuous port: A promiscuous port is, by definition, a port that is allowed to communicate
with any other port type.
• Trunk port: A trunk port, by definition, carries VLAN traffic across switches:
• A trunk port in a PVLAN is always tagged.
• Primary or secondary VLAN traffic is carried by the trunk port in tagged mode.
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).
ip local-proxy-arp
c s
Enable/disable Layer 3 communication between secondary VLANs in a private VLAN.
Syntax
[no] ip local-proxy-arp
To disable Layer 3 communication between secondary VLANs in a private VLAN, use the no ip
local-proxy-arp command in the INTERFACE VLAN mode for the primary VLAN.
To disable Layer 3 communication in a particular secondary VLAN, use the no ip local-proxy-arp
command in the INTERFACE VLAN mode for the selected secondary VLAN.
Note: Even after ip-local-proxy-arp is disabled (no ip-local-proxy-arp) in a secondary VLAN,
Layer 3 communication may happen between some secondary VLAN hosts, until the ARP timeout
happens on those secondary VLAN hosts.
Defaults
Layer 3 communication is disabled between secondary VLANs in a private VLAN.
Command Modes
INTERFACE VLAN