Glossary

Quality of Service (QoS)
The Dell EMC Networking OS commands for quality of service (QoS) include traffic conditioning and congestion control. QoS
commands are not universally supported on all Dell EMC Networking products.
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
By default, while rate limiting, policing, and shaping, Dell EMC Networking OS 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.
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.
Command Modes CONFIGURATION
Command
History
This guide is platform-specific. For command information about other platforms, see the relevant Dell
EMC Networking OS Command Line Reference Guide.
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S3148.
9.10(0.0) Introduced on the S6100-ON.
9.8(2.0) Introduced on the S3100 series.
9.8(1.0) Introduced on the Z9100-ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
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