Set Dscp - HP ProCurve 7102dl Reference Manual

SROS Command Line Interface Reference Guide

set dscp

The set dscp command is an optional command for a QoS map that can be used to modify the
Differentiated Service Code Point (DSCP) field (on matching packets) to the specified value. For more
details on determining the DSCP field, refer to the Technology Review section of the match command on
page 1395. Use the no form of this command to remove a specified DSCP value. Variations of this
command include:
set dscp <value>
set dscp afxx
set dscp csx
set dscp default
set dscp ef
Syntax Description
<value>
afxx
csx
default
ef
Default Values
No default value is necessary for this command.
Functional Notes
QoS policies are configured in the SROS CLI to dictate the priority for servicing specified traffic types on a
particular interface. QoS policies contain at least one match reference (using the match command) and
one or more action items (using the priority, bandwidth, or set commands).
The set dscp command can be used to change the Differentiated Services (DS) Field for incoming traffic
serviced by the QoS policy. Every IPv4 header contains an 8-bit Type of Service (ToS) field used for
marking data types requiring special handling when traveling through the network. Originally this ToS field
was used for IP precedence markings (using only the first 3 bits of the 8-bit field), and was later revised in
RFC 2474 to create the 6-bit DS field (reserving the last two bits of the field for future use). The DS field
can be manipulated to indicate higher or lower traffic priority using decimal values between 0 and 63.
Usage Examples
This command sets the DSCP value (for all matching traffic) to 46:
5991-2114
Specifies the DSCP numeric value. Valid range is 0 to 63.
Specifies the assured forwarding (AF) class and subclass. Select from: 11
(001010), 12 (001100), 13 (001110), 21 (010010), 22 (010100),
23 (010110), 31 (011010), 32 (011100), 33 (011110), 41 (100010),
42 (100100), or 43 (100110).
Specifies the class selector (CS) value. Valid range is 1 to 7.
Specifies the default IP DSCP value (000000).
Specifies marking for expedited forwarding (EF).
© Copyright 2007 Hewlett-Packard Development Company, L.P.
Quality of Service (QoS) Map Commands
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