4.
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4.1.2.2 VLAN
This section provides a brief description of VLANs and explains how to create and modify
virtual LANs which are more commonly known as VLANs. A VLAN is a logical network
under a certain switch or router device to group lots of client hosts with a specific VLAN ID.
This device supports both Port-based VLAN and Tag-based VLAN. In Port-based VLAN, all
client hosts belong to the same group by transferring data via some physical ports that are
tagged with same VLAN ID in the device. The ports of a VLAN form an independent traffic
domain in which the traffic generated by the nodes remains within the VLAN. However, in
Tag-based VLAN, all packets with same VLAN ID will be treated as the same group of them
and own same access property and QoS property. It is especially useful when individuals of
a VLAN group are located at different floor location.
The VLAN function allows you to divide local network into different “virtual LANs”. In some
cases, ISP may need router to support “VLAN tag” for certain kinds of services (e.g. IPTV)
to work properly. In some cases, SMB departments are separated and located at any floor
of building. All client hosts in same department should own common access property and
QoS property. You can select either one operation mode, port-based VLAN or tag-based
VLAN, and then configure according to your network configuration.
Please be noted, since there is only one physical Ethernet LAN port in the gateway, there is
only little configuration if you choose the Port-based VLAN.
4.1.2.2.1 VLAN Scenarios
There are some common VLAN scenarios for the device as follows:
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Port-Based VLAN Tagging for Differentiated Services
Port-based VLAN function can group Ethernet port, Port-1, and WiFi Virtual
Access Points, VAP-1 ~ VAP-8, together for differentiated services like Internet
surfing, multimedia enjoyment, VoIP talking, and so on. Two operation modes,
NAT and Bridge, can be applied to each VLAN group. One DHCP server is
allocated for an NAT VLAN group to let group host member get its IP address.
Thus, each host can surf Internet via the NAT mechanism of business access
gateway. At bridge mode, Intranet packet flow was delivered out WAN trunk port
with VLAN tag to upper link for different services.