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Configuring VLANs Creating/Modifying VLANs

OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006 page 5-5

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.

Up to 4094 VLANs are supported per 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 spec-

ifies 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.

The operational status of a VLAN 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 5-7 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.

On the OmniSwitch 6800 and 6850, it is also possible to specify a range of VLAN IDs with the vlan

command. Use a hyphen to indicate a contiguous range and a space to separate multiple VLAN ID entries.

For example, the following command creates VLANs 10 through 15, 100 through 105, and VLAN 200 on

the switch:

-> vlan 10-15 100-105 200 name “Marketing Network”

To remove a VLAN from the switch configuration, use the no form of the vlan command.

-> no vlan 755

-> no vlan 100-105

-> no vlan 10-15 200

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 VLAN router interfaces, see “Configuring VLAN

Router Interfaces” on page 5-11.

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Alcatel 9000 Guía de usuario Pagina 105