Service Manual

Quality of Service (QoS)
The Dell Networking OS commands for quality of service (QoS) include traffic conditioning and congestion control. QoS
commands are not universally supported on all Dell Networking products. platform.
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 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.
S4048–ON
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
Networking OS Command Line Reference Guide.
Version Description
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.
8.3.7.0 Introduced on the S4810.
8.3.1.0 Introduced.
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