Ip Tos Classification - Black Box 12-Port 1000BASE-TX L2 Managed PoE Switch User Manual

12-Port 1000BASE-TX L2 Managed PoE Switch with 2 SFP Dual Media Ports
Parameter
Quality of Service (QoS) Vlan
Tag Configuration
Port
Bit 0, Bit 1, Bit 2
Class
4.7.3 I T C
P OS LASSIFICATION
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 5~7 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 1, 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.
Parameter
Port
Bit 0, Bit 1, Bit 2
Class
52
Table 4-19. VLAN Tag Priority screen options.
Description
Used for setting up the QoS belongs to Vlan operation.
User can set up the port (1~12) respectively to let Vlan Tag 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.
According to the arrangement of VLAN-tagged priority, it can form
8 kinds of traffics, including 0 0 0, 0 0 1, 0 1 0, 0 1 1, 1 0 0, 1 0 1, 1
1 0 and 1 1 1.
8 kinds of traffic as mentioned above, user can set up High Priority
or Low Priority for each port respectively.
Table 4-20. IP TOS Classification screen options.
Description
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.
According to the arrangement of Bit 5 ~ Bit 7 in TOS Field of IP
Header, it can form 8 kinds of traffics, including 0 0 0, 0 0 1, 0 1 0,
0 1 1, 1 0 0, 1 0 1, 1 1 0 and 1 1 1.
8 kinds of traffic as mentioned above, user can set up High Priority
or Low Priority for each port respectively.