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Operation Manual – VLAN
Quidway S3100 Series Ethernet Switches
Chapter 1 VLAN Configuration
1.1 VLAN Overview
1.1.1 Introduction to VLAN
The virtual local area network (VLAN) technology is developed for switches to control
broadcast operations in LANs.
By creating VLANs in a physical LAN, you can divide the LAN into multiple logical LANs,
each of which has a broadcast domain of its own. Hosts in the same VLAN
communicate with each other as if they are in a LAN. However, hosts in different VLANs
cannot communicate with each other directly. Figure 1-1 illustrates a VLAN
implementation.
LAN Switch
Figure 1-1 A VLAN implementation
A VLAN can span across multiple switches, or even routers. This enables hosts in a
VLAN to be dispersed in a more loose way. That is, hosts in a VLAN can belong to
different physical network segment.
VLAN enjoys the following advantages.
1)
Broadcast domains are confined in VLANs. This decreases bandwidth utilization
and improves network performance.
2)
Network security is improved. VLANs cannot communicate with each other
directly. That is, hosts in different VLANs cannot communicate with each other
directly. To enable communications between different VLANs, network devices
operating on Layer 3 (such as routers or Layer 3 switches) are needed.
VLAN A
VLAN B
LAN Switch
VLAN A
VLAN B
Router
Huawei Technologies Proprietary
VLAN A
VLAN B
1-1
Chapter 1 VLAN Configuration
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