H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 147)

21-1
21
VLAN Configuration
Support of the H3C WX series access controllers for features may vary by device model. For more
information, see "Feature Matrixes" in Compatibility Matrixes.
The sample output in this manual was created on the WX5004. The output on your device may
vary.
The grayed out functions or parameters on the Web interface indicate that they are not supported
or cannot be modified.
The models listed in this manual are not applicable to all regions. Please consult your local sales
office for the models applicable to your region.
Overview
Introduction to VLAN
Ethernet is a network technology based on the Carrier Sense Multiple Access/Collision Detect
(CSMA/CD) mechanism. As the medium is shared, collisions and excessive broadcasts are common
on an Ethernet. To address the issue, virtual LAN (VLAN) was introduced. The idea is to break a LAN
down into separate VLANs, that is, Layer 2 broadcast domains whereby frames are switched between
ports assigned to the same VLAN. VLANs are isolated from each other at Layer 2. A VLAN is a bridging
domain, and all broadcast traffic is contained within it, as shown in Figure 21-1 .
Figure 21-1 A VLAN diagram
VLAN 2
VLAN 5
Switch B Switch A
Router