Filter
Top Products
Creating/Modifying VLANs Configuring VLANs
page 4-6 OmniSwitch 6600 Family Network Configuration Guide April 2006
Creating/Modifying VLANs
The initial configuration for all Alcatel switches consists of a default VLAN 1 and all switch ports are
initially assigned to this VLAN. When a switching module is added to the switch, the module’s physical
ports are also assigned to VLAN 1. If additional VLANs are not configured on the switch, then the entire
switch is treated as one large broadcast domain. All ports will receive all traffic from all other ports.
Alcatel switches support up to 4094 VLANs on one switch, including default VLAN 1. In compliance
with the IEEE 802.1Q standard, each VLAN is identified by a unique number, referred to as the VLAN ID.
The user specifies a VLAN ID to create, modify or remove a VLAN and to assign switch ports to a
VLAN. When a packet is received on a port, the port’s VLAN ID is inserted into the packet. The packet is
then bridged to other ports that are assigned to the same VLAN ID. In essence, the VLAN broadcast
domain is defined by a collection of ports and packets assigned to its VLAN ID.
A VLAN’s operational status remains inactive until at least one active switch port is assigned to the
VLAN. This means that VLAN properties, such as Spanning Tree or router interfaces, also remain inac-
tive. Ports are considered active if they are connected to an active network device. Non-active port assign-
ments are allowed, but do not change the VLAN’s operational state.
Ports are either statically or dynamically assigned to VLANs. When a port is assigned to a VLAN, a
VLAN port association (VPA) is created and tracked by VLAN management switch software. For more
information about VPAs, see “Defining VLAN Port Assignments” on page 4-7 and Chapter 7, “Assigning
Ports to VLANs.”
Adding/Removing a VLAN
To add a VLAN to the switch configuration, enter vlan followed by a unique VLAN ID number between 2
and 4094, an optional administrative status, and an optional description. For example, the following
command creates VLAN 755 with a description:
-> vlan 755 enable name “IP Finance Network”
By default, administrative status and Spanning Tree are enabled when the VLAN is created and the VLAN
ID is used for the description if one is not specified. Note that quotation marks are required if the descrip-
tion contains multiple words separated by spaces. If the description consists of only one word or multiple
words separated by another character, such as a hyphen, then quotes are not required.
To remove a VLAN from the switch configuration, use the no form of the vlan command.
-> no vlan 755
When a VLAN is deleted, any router interfaces defined for the VLAN are removed and all VLAN port
associations are dropped. For more information about router interfaces, see “Configuring VLAN Router
Interfaces” on page 4-12.
To view a list of VLANs already configured on the switch, use the show vlan command. See “Verifying
the VLAN Configuration” on page 4-14 for more information.