Alloy GSM-16T2SFP, Руководство пользователя

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GSM Series User Manual
46
Alloy Computer Products Pty Ltd Copyright ©2006
Fig. 3-20
Function Name:
IP TOS Classification
Function Description:
The GSM Series switches allow the administrator to configure priority levels based on the
TOS field of the IP Header. There are three bits in the TOS field which can be arranged
into 8 different traffic classes: 000, 001, 010, 011, 100, 101, 110 and 111.
We can then set a High or Low priority level for each of these 8 traffic classes. For
instance, if we set TOS 000 as a High priority and TOS 001 as a Low priority and then
send packets to port 1 with a TOS field of 000 and packets to port 2 with a TOS field of
001 at 1Gb to port 3 of the switch and the switch becomes congested packets from port 2
may be partially dropped due to the lower priority levels.
Parameter Description:
Port:
Select the port you wish to configure your priority levels for, if you wish to
configure all ports at the same time, select all from the drop down box.
Bit 0, Bit 1, Bit 2:
According to the arrangement of bits 5 ~ 7 in the TOS field of the IP Header,
priority can be set into 8 types of traffic classifications, including 000, 001, 010,
011, 100, 101, 110 and 111.
Class:
You can now assign a High or Low priority level to each of the 8 traffic classes.