Reference Guide

42
Quality of Service (QoS)
The Dell Networking operating software (FTOS) commands for quality of service (QoS) include traffic conditioning and
congestion control. QoS commands are supported on the S4820T platform.
This chapter contains the following sections:
• Global Configuration Commands
• Per-Port QoS Commands
• Policy-Based QoS Commands
Global Configuration Commands
There is only one global configuration QoS command.
qos-rate-adjust
By default, while rate limiting, policing, and shaping, FTOS 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. You can optionally include overhead fields in rate metering calculations by enabling
QoS Rate Adjustment.
S4820T
Syntax
qos-rate-adjustment overhead-bytes
Parameters
overhead-bytes Include a specified 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, and no qos-rate-adjust is listed in the
running-configuration
Command Modes CONFIGURATION
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
1091