Reference Guide

Quality of Service (QoS)
The Dell Networking operating software commands for quality of service (QoS) include traffic conditioning and congestion
control.
This chapter contains the following sections:
● Global Configuration Commands
● Per-Port QoS Commands
● Policy-Based QoS Commands
Topics:
• Global Configuration Commands
• Per-Port QoS Commands
• Policy-Based QoS Commands
• DSCP Color Map Commands
Global Configuration Commands
There is only one global configuration QoS command.
qos-rate-adjust
Enable QoS rate adjustment to include overhead fields in rate metering calculations.
Z9500
Syntax
qos-rate-adjust overhead-bytes-number
Parameters
overhead-bytes-
number
Enter the number of bytes of packet overhead to include in rate limiting, policing,
and shaping calculations. The range is from 1 to 31.
Defaults QoS rate adjustment is disabled by default.
Command Modes CONFIGURATION
Command
History
This guide is platform-specific. For command information about other platforms, refer to the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.2(1.0) Introduced on the Z9500.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
8.3.1.0 Introduced.
Usage
Information
By default, when rate policing and shaping, the system does not include the Preamble, SFD, or the IFG
fields. These fields are overhead; only the fields from MAC destination address to the CRC are used for
forwarding and are included in these rate metering calculations.
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