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ip local-proxy-arp
c s
Syntax
Defaults
Command Modes
1156
|
Private VLAN (PVLAN)
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).
Enable/disable Layer 3 communication between secondary VLANs in a private VLAN.
[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.
Layer 3 communication is disabled between secondary VLANs in a private VLAN.
INTERFACE VLAN
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