User`s manual

130 Asanté IntraCore 36000 Series
11.5 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.
Configuring Switch Using the Web or CLI
Web
Click Priority – IP Precedence/DSCP Priority Status. Select Disabled, IP Precedence or IP DSCP from
the scroll-down menu.
CLI
The following example enables IP Precedence service on the switch.
Console(config)#map ip precedence
Console(config)#
11.5.1 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 (For example,
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.
Priority Level Traffic Type Priority Level Traffic Type
7 Network Control 3 Flash
6 Internetwork Control 2 Immediate
5 Critical 1 Priority
4 Flash Override 0 Routine