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Quality of Service (QoS)
The Dell Force10 operating software (FTOS) commands for quality of service (QoS) include traffic conditioning and
congestion control. QoS commands are supported on the C-Series, E-Series, S-Series, Z-Series, and S4810 Dell Force10
platforms.
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.
C-Series, E-Series, S-Series, Z-Series, S4810
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. For the C-Series and
S-Series, the range is 1 to 31. For the E-Series, the range is 1 to 144.
Defaults QoS rate adjustment is disabled by default, and no qos-rate-adjust is listed in the
running-configuration
Command Modes CONFIGURATION
Command History
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
Version 8.3.1.0 Introduced.
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