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Command Attributes
• IP Precedence/DSCP Priority Status – Selects IP Precedence,
DSCP, or disables both priority services.
Web – Click Priority, IP Precedence Priority. Select IP Precedence or IP
DSCP from the IP Precedence, DSCP Priority Status menu.
CLI – The following example globally enables IP Precedence service on
the switch.
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.
Console(config)#map ip precedence 3-156
Console#
Priority Level Traffic Type
7 Network Control
6 Internetwork Control
5Critical
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