Signamax
™
065-7921PoE 12-Port 10/100/1000BaseT/TX Web Smart PoE Switch
70
Function name:
IP ToS Classification
Function description:
Another QoS function is the application of Layer 3 on network framework. We focus on
TOS field of IP header. There are three bits in TOS field. We means bit 2~4 of TOS field
that we will use. According to these 3 bits, we could arrange 8 traffics –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 we change bit 5~7 of TOS field of IP header,
we will create the 8 traffic packets we meant before. Moreover, we can set High priority or
Low priority 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 appears
0 0 0 from the port 2 and the packets that have bit 5~7 of TOS Field appears 0 0 1 from
the port 3. We let the two kinds of packets be transmitted for port 1 until the port results in
congestion. The result is that the packets will be dropped partially from the port 3
because the packets that belong to Low Priority. For the use of TOS Priority function,
please press Configure at the right section for setting in advance.
Fig. 4-16
Parameter description:
Quality of Service (QoS) ToS Configuration:
Used for setting up the QoS in Layer 3.
Port:
User can set up the port (1~12) respectively to let TOS QoS function work on them.
If you would like to set up all ports at a time, user is also allowed to choose “All” in
the selection list to simplify the procedure of configuration.
