7
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6. About VLAN and QoS
6.1
VLAN
The VLAN setting of a switch can divide the switch to several switching segments. The network
connections on different VLANs can not send or receiver data from each other. Even broadcast
packets can not be transferred between VLANs. So, the VLAN function is often used for user's
security application.
Here are two examples for VLAN applications.
The first one is called
Concentration VLAN
setting. In this case, Port (1,16), (2,16), (3,16),
(4,16), …, (13,16), (14,16), (15,16) are in different VLANs and Port 16 is the common port for
uplink or Internet connection. But the data transfer between Port 1, 2, 3, 4, …, 13, 14 and 15 are
impossible for such configuration.
The second one is the default VLAN setting of the switch. Every port belongs to the same
VLAN and can communicate with each other.
Please refer to Section 7 to configure the VLAN from the console port.
6.2 QoS
In new network application, there is a tag in the Ethernet packet. The tag contains VLAN and
priority information of the packet. This 16-port Switch can process both tagged and untagged
packets at ingress ports. If there is a tag in an Ethernet packet, it can transmit the packet
according to the priority of the packet in the tag.
There are 4 transmit queues for each port of the 16-port Switch. This 16-port Switch can transfer
packets according to the priority of the packet to meet the "Quality of Service" request in the
network. It is very important for multi-media data (for example: movie, music and voice)
transfer in a network.
Note: The QoS function is not configurable and is defined in the switch controller.
1
2
3
13
14
15
16
Uplink / Internet
Connection
. . . . .
1
2
3
13
14
15
16
. . . . .
