LevelOne GTL-2691 - Manual (Page 282)

C HAPTER 10 | Class of Service
Layer 3/4 Priority Settings
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C OMMAND U SAGE
◆ The DSCP is six bits wide, allowing coding for up to 64 different
forwarding behaviors. The DSCP retains backward compatibility with
the three precedence bits so that non-DSCP compliant devices will not
conflict with the DSCP mapping. Based on network policies, different
kinds of traffic can be marked for different kinds of forwarding.
◆ DSCP priority values are mapped to default Class of Service values
according to recommendations in the IEEE 802.1p standard, and then
subsequently mapped to the eight hardware priority queues. The
default mapping is defined in the following table. Note that all the DSCP
values that are not specified are mapped to CoS value 0.
N OTE :
IP DSCP settings apply to all interfaces.
P ARAMETERS
These parameters are displayed:
◆ DSCP Mapping Status – Enables or disables the use of IP DSCP
priorities and the mapping of these priority values to CoS values.
(Default: Disabled)
◆ IP DSCP – 8-bit DSCP value. (Range: 0-63)
◆ CoS – Class-of-Service value (Range: 0-7)
W EB I NTERFACE
To set the IP DSCP to CoS priority map:
1.
Click Traffic, Priority, IP DSCP to CoS.
2. Locate an entry from the DSCP table, and enter a value in the CoS field.
3.
Click Apply.
Table 16: Mapping DSCP Priority Values
IP DSCP Value CoS Value
0 0
8 1
10, 12, 14, 16 2
18, 20, 22, 24 3
26, 28, 30, 32, 34, 36 4
38, 40, 42 5
48 6
46, 56 7