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Selecting IP Precedence/DSCP Priority
The switch allows you to choose between using IP Precedence or DSCP
priority. Select one of the methods or disable this feature.
Command Attributes
•
Disabled – Disables both priority services. (This is the default setting.)
•
IP Precedence – Maps layer 3/4 priorities using IP Precedence.
•
IP DSCP – Maps layer 3/4 priorities using Differentiated Services
Code Point Mapping.
Web – Click Priority, IP Precedence/DSCP Priority Status. Select
Disabled, IP Precedence or IP DSCP from the scroll-down menu, then
click Apply.
Figure 3-76 IP Precedence/DSCP Priority Status
CLI – The following example enables IP Precedence service on the
switch.
Console(config)#map ip precedence
Console(config)#
Mapping IP Precedence
The Type of Service (ToS) octet in the IPv4 header includes three
precedence bits defining eight different priority levels ranging from highest
priority for network control packets to lowest priority for routine traffic.
The default IP Precedence values are mapped one-to-one to Class of
Service values (i.e., Precedence value 0 maps to CoS value 0, and so forth).
Bits 6 and 7 are used for network control, and the other bits for various
application types. ToS bits are defined in the following table.
C
S
LASS OF
ERVICE
C
ONFIGURATION
4-229
3-175
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