SROS Command Line Interface Reference Guide
Quality of Service (QoS) Map Commands
5991-2114
© Copyright 2007 Hewlett-Packard Development Company, L.P.
1403
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
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>
Specifies the DSCP numeric value. Valid range is 0 to 63.
afxx
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).
csx
Specifies the class selector (CS) value. Valid range is 1 to 7.
default
Specifies the default IP DSCP value (000000).
ef
Specifies marking for expedited forwarding (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
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