C
HAPTER
37
| Class of Service Commands
Priority Commands (Layer 3 and 4)
– 880 –
EXAMPLE
The following example shows how to enable IP precedence mapping
globally:
Console(config)#map ip precedence
Console(config)#
map ip dscp
(Interface
Configuration)
This command sets IP DSCP priority (i.e., Differentiated Services Code
Point priority). Use the no form to restore the default table.
SYNTAX
map ip dscp dscp-value cos cos-value
no map ip dscp
dscp-value - 8-bit DSCP value. (Range: 0-63)
cos-value - Class-of-Service value (Range: 0-7)
DEFAULT SETTING
The DSCP default values are defined in the following table. Note that all the
DSCP values that are not specified are mapped to CoS value 0.
COMMAND MODE
Interface Configuration (Ethernet, Port Channel)
COMMAND USAGE
â—† The precedence for priority mapping is IP Port, IP Precedence or IP
DSCP, and default switchport priority.
â—† DSCP priority values are mapped to default Class of Service values
according to recommendations in the IEEE 802.1p standard, and then
subsequently mapped to the eight hardware priority queues.
â—† This command sets the IP DSCP priority for all interfaces.
Table 109: Mapping IP DSCP to CoS Values
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
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