Vlan Overview; Configuring Vlan; Vlan C - 3Com 8807 Configuration Manual

7

VLAN Overview

Configuring VLAN

Creating/Deleting a
VLAN

VLAN C

ONFIGURATION
Virtual local area network (VLAN) groups the devices in a LAN logically, not
physically, into segments to form virtual workgroups. IEEE issued the IEEE 802.1Q
in 1999 to standardize the VLAN implementations.
The VLAN technology allows network administrators to logically divide a physical
LAN into different broadcast domains or the so-called virtual LANs. Every VLAN
contains a group of workstations with the same demands. The workstations,
physically separated, are not necessarily on the same physical LAN segment.
You can establish VLANs of the following types on switches:
Port-based
■
IP multicast-based (A multicast group can be a VLAN.)
■
Network layer-based (A VLAN can be established by the network layer
■
addresses or protocols of the hosts.)
With the VLAN technology, the broadcast and unicast traffic within a VLAN will
not be forwarded to other VLANs. This is helpful to control network traffic, save
device investment, simplify network management and enhance security.
The following sections describe VLAN configuration tasks:
"Creating/Deleting a VLAN"
■
"Specifying a Description Character String for a VLAN or VLAN interface"
■
"Naming the Current VLAN"
■
"Shutting down/Bringing up a VLAN Interface"
■
"Configuring Port-Based VLAN"
■
You can use the following commands to create/delete a VLAN. If the VLAN to be
created exists, the system will enter the VLAN view directly. Otherwise, the system
will create the VLAN first, and then enter the VLAN view.
Perform the following configuration in system view.
Table 34 Create/Delete a VLAN or VLANs
Operation
Create a VLAN and enter the VLAN view
Create VLANs in batch
Delete an VLAN or VLANs
Command
vlan vlan-id
vlan vlan-id-list
undo vlan { vlan-id [ to vlan-id ] | all }