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Private VLAN (PVLAN)
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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 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
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 INTERFACE VLAN mode for the primary VLAN.
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