Reference Guide

Quality of Service (QoS) | 935
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Quality of Service (QoS)
Overview
FTOS commands for Quality of Service (QoS) include traffic conditioning and congestion control.
QoS commands are not universally supported on all Dell Force10 platforms.
This chapter contains the following sections:
• Global Configuration Commands
• Per-Port QoS Commands
• Policy-Based QoS Commands
The symbols
e c s z under command headings indicate which Dell Force10 platforms —
E-Series, C-Series, S-Series or Z-Series, respectively — support the command.
Global Configuration Commands
• qos-rate-adjust
qos-rate-adjust
c e s z
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.
Syntax
qos-rate-adjustment overhead-bytes
Parameters
Defaults
QoS Rate Adjustment is disabled by default, and no qos-rate-adjust is listed in the
running-configuration
Command Modes
CONFIGURATION
overhead-bytes
Include a specified number of bytes of packet overhead to include in rate limiting,
policing, and shaping calculations.
C-Series and S-Series Range: 1to 31
E-Series Range: 1 to 144