Reference Guide

Quality of Service (QoS) | 461

Quality of Service (QoS)

Overview

The Dell Force10 operating software (FTOS) commands for quality of service (QoS) include traffic

conditioning and congestion control. This chapter contains the following sections:

• Global Configuration Commands

• Policy-Based QoS Commands

Global Configuration Commands

• qos-rate-adjust

• service-class dot1p-mapping

qos-rate-adjust

By default, for rate policing and rate 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

Command

History

overhead-bytes

Include a specified number of bytes of packet overhead to include in rate policing,

and rate shaping calculations.

Range: 1-31

Version 8.3.16.1 Introduced on MXL 10/40GbE Switch IO Module