Allied Telesis AR400 Series Router - Manual (Page 67)

Physical and Layer 2 Interfaces 67
Software Release 2.5.2
C613-02034-00 REV A
For more information about limiting switch traffic, see the SET SWITCH PORT
command in the Switching on the AR450 chapter in the AR400 Series Router
Software Reference.
Virtual LANs
A Virtual LAN (VLAN) is a software-defined broadcast domain. The router’s
VLAN feature allows you to segment a network by software management to
improve network performance. You can group workstations, servers, and other
network equipment connected to the router according to similar data and
security requirements. This is done by allocating the switch ports on the router
to VLANs, each of which is a separate broadcast domain.
By default, the router has one VLAN, the default VLAN, with a VLAN
Identifier (VID) of 1. All switch ports belong to the default VLAN, and all ports
send untagged packets. You cannot delete the default VLAN from the router.
If all you want the router to do is switch traffic on your LAN using the default
VLAN configuration, you need not perform any configuration. Simply power
up the router and connect devices to the switch ports. Switch learning is
enabled by default, and all valid packets are forwarded.
To create a new VLAN on the router, specify a vlanname and VID that are
unique in the router. Enter the command:
CREATE VLAN=vlanname VID=2..4094
You cannot delete the default VLAN, but to delete other VLANs if they have no
member ports, enter the command:
DESTROY VLAN={vlanname|2..4094|ALL}
Any port in the default VLAN can be added to another VLAN, and is then
automatically removed from the default VLAN. Each port can only belong to
one VLAN. To add an untagged port to a VLAN, enter the command:
ADD VLAN={vlanname|2..4094} PORT={port-list|ALL}
To return ports to the default VLAN, enter the command:
DELETE VLAN={vlanname|2..4094} PORT={port-list|ALL}
To display the VLANs configured on the router, enter the command:
SHOW VLAN[={vlanname|1..4094|ALL}
To enable communication between ports in different VLANs, you need to
configure IP or another Layer 3 protocol over the VLAN interfaces.
For more information about VLANs, see “Virtual Local Area Networks (VLANs)”
in the Switching on the AR410 chapter or Switching on the AR450 chapter in the
AR400 Series Router Software Reference.