SignaMax 065-7931 User's Guide download pdf (Page 74)

Signamax 065-7931 16-Port 10/100/1000BaseT/TX WebSmart Switch

4-2-8. Quality of Service Configuration

The

switch offers powerful QoS functionality. This function supports VLAN-

tagged priority that can assign precedence of up to 8 priorities; IP TOS

Classification; IP TCP/UDP Port Classification; and IP DiffServ Classification.

In Quality of Service (QoS) Configuration, there is one option named ”Default

Class”. If the user had selected one of the four QoS functions, then some packets

that did not belong to this QoS setting would be viewed as Default Class. For

instance, if you set the QoS function as VLAN Tag Priority mode, and then choose

Default Class as High, then the priority of the packets with no tag will be considered

as High priority precedence. The initial value of the Default Class is High.

Fig. 4-13

Function name:

VLAN Tag Priority

Function description:

In VLAN tagging, there are 3 bits belonging to priority. According to these 3

bits, we could arrange 8 traffic classes –0 0 0, 0 0 1, 0 1 0, 0 1 0, 1 0 0, 1 0 1,

1 1 0, 1 1 1. We can set High priority or Low priority for each traffic class. For

instance, let us let VLAN-tagged priority 0 0 0 be high priority and VLAN-

tagged priority 0 0 1 be Low Priority, and then assign ports 1, 2, 3 to reside in

VLAN 2. Packets are sent to ports 2 and 3 that have VLAN-tagged Field

assigned as 0 0 0 and VID equals 2 from the port 2 and the packets that have

VLAN-tagged Field appears 0 0 1 and VID equals 2 from the port 3. We let the

two kinds of packets be transmitted to port 1 until the port results in congestion.

The result is that the packets will be dropped partially from port 3, because the

packets that emanate from there are assigned Low Priority. To use the VLAN

Tag Priority function, please press the <Configure> button at the right section

to set it in advance.

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SignaMax 065-7931 User's Guide Page 74