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3-90 Sun Fire B1600 Blade System Chassis Switch Administration Guide • June 2003
3.3.5.6 Mapping DSCP Priority
The DSCP is six bits wide, enabling coding for up to 64 different forwarding
behaviors. The DSCP replaces the ToS bits, but it retains backward compatibility
with the three precedence bits so that non-DSCP compliant, ToS-enabled devices,
will not conflict with the DSCP mapping. Based on network policies, different kinds
of traffic can be marked for different kinds of forwarding. The DSCP default values
are defined in the following table. Note that all the DSCP values that are not
specified in the following table are mapped to COS value 0.
When mapping DSCP values to COS values through the web interface or CLI, the
following parameters can be configured:
■ DSCP – The current DSCP Priority to COS map.
■ Class of Service Value – The COS value that is mapped to the selected DSCP
Priority value. Note that “0” represents low priority and “7” represents high
priority.
Web Interface: Mapping DSCP Priority
1. Open Switch Config ⇒ Class of Service ⇒ Layer 3/4 Traffic Prioritisation.
2. Scroll to Mapping DSCP to Class of Service Values.
3. Select an entry from the DSCP table.
4. Select a value from the Class of Service Value menu.
5. Click Save.
TABLE 3-29 Default DSCP to COS Mapping
IP DSCP Value COS Value
00
81
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