SignaMax 065-7931 User's Guide download pdf (Page 77)

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

Function name:

IP TOS Classification

Function description:

Another QoS function is the application of Layer 3 on the network framework.

This focuses on the TOS field of the IP header. There are three bits in the TOS

field. Bits 2~4 of the TOS field are used. According to these 3 bits, 8 traffic

classes can be arranged –0 0 0, 0 0 1, 0 1 0, 0 1 0, 1 0 0, 1 0 1, 1 1 0, 1 1 1.

As long as bits 5~7 of the TOS field of the IP header are changed, we will

create the 8 traffic packets intended. Moreover, High priority or Low priority

can be set for each traffic class. For instance, if we let TOS 0 0 0 be high

priority and TOS 0 0 1 be Low Priority, we sent in the packets that have bit 5~7

of TOS Field appear as 0 0 0 from port 2 and the packets that have bit 5~7 of

TOS Field appear as 0 0 1 from 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 those packets are

assigned Low Priority. To use the TOS Priority function, please press the

<Configure> button at the right section to set it in advance.

Fig. 4-15

Parameter description:

Quality of Service (QoS) ToS Configuration:

Used for setting up the QoS assignments in Layer 3.

Port:

The user can set up ports (1~24) respectively to let the TOS QoS

function operate on them. If it is desirable to set up all ports at a time, the

user is also allowed to choose “All” in the selection list to simplify the

configuration procedure.

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SignaMax 065-7931 User's Guide Page 77