C
HAPTER
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| Quality of Service
DSCP-Based Priority
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Figure 24: Port-Based Priority Setting
DSCP-BASED PRIORITY
The Differentiated Services Code Point (DSCP) is a six-bit field in the IP
header, allowing 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.
Note that all the DSCP values that are not specified are mapped to priority
value 0.
PARAMETERS
The following parameters are displayed on the DSCP-Based Priority page:
◆ DSCP — Lists the DSCP values. (Range: 0-63)
◆ Priority — Maps a priority value to the selected DSCP Priority value.
Note that “0” represents low priority and “7” represent high priority.
◆ DSCP Priority Table — Shows the DSCP to Priority map.
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