3com 8807 User Guide

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:

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Port-based

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IP multicast-based (A multicast group can be a VLAN.)

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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:

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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

Create a VLAN and enter the VLAN view 

vlan vlan-id 

Create VLANs in batch 

vlan vlan-id-list 

Delete an VLAN or VLANs 

undo vlan { vlan-id [ to vlan-id ] | all }