Getting started

About this guide

This guide describes the Quality of Service (QoS) provided by the routers and presents examples to configure and implement various protocols and services.

This document is organized into functional chapters and provides concepts and descriptions of the implementation flow, as well as Command Line Interface (CLI) syntax and command usage.

Note: Unless otherwise indicated, this guide uses classic CLI command syntax and configuration examples.

The topics and commands described in this document apply to the:

7450 ESS
7750 SR
7950 XRS
Virtualized Service Router

For a list of unsupported features by platform and chassis, see the SR OS R24.x.Rx Software Release Notes, part number 3HE 20152 000x TQZZA.

Command outputs shown in this guide are examples only; actual displays may differ depending on supported functionality and user configuration.

Note:

The SR OS CLI trees and command descriptions can be found in the following guides:

7450 ESS, 7750 SR, 7950 XRS, and VSR Classic CLI Command Reference Guide
7450 ESS, 7750 SR, 7950 XRS, and VSR Clear, Monitor, Show, and Tools CLI Command Reference Guide (for both MD-CLI and Classic CLI)
7450 ESS, 7750 SR, 7950 XRS, and VSR MD-CLI Command Reference Guide

Note: This guide generically covers Release 24.x.Rx content and may contain some content that will be released in later maintenance loads. See the SR OS R24.x.Rx Software Release Notes, part number 3HE 20152 000x TQZZA for information about features supported in each load of the Release 24.x.Rx software.

QoS configuration process

Configuration process lists the tasks necessary to configure and apply QoS policies. This guide is presented in an overall logical configuration flow. Each section describes a software area and provides CLI syntax and command usage to configure parameters for a functional area.

Table 1. Configuration process
Area	Task	Section
Match lists in network, SAP ingress and SAP egress QoS policies	Configure a QoS match list	Match list for QoS policies
Network QoS policies	Configure a network QoS policy	Basic configurations
Network QoS policies	Service management	Service management tasks
Network queue QoS policies	Configure a network queue QoS policy	Basic configurations
Network queue QoS policies	Service management	Service management tasks
Service Ingress and Egress QoS policies	Configure a service ingress QoS policy	Service ingress QoS policy
	Configure a service egress QoS policy	Service egress QoS policy
	Service management	Service management tasks
Queue sharing and redirection	Configure ingress and egress queue groups	Basic configurations
Scheduler QoS policies	Configure a QoS scheduler policy	Basic configurations
Scheduler QoS policies	Service management	Service management tasks
Slope QoS policies	Configure a slope QoS policy	Basic configurations
Slope QoS policies	Service management	Service management tasks
Shared-Queue QoS policies	Configure a shared-queue QoS policy	Basic configurations
Advanced QoS policies	Configure advanced QoS policies	Basic configurations
Advanced QoS policies	Service management	Service management tasks
High Scale QoS IOM	Configure HSQ IOM	High scale QoS IOM
Class Fair Hierarchical Policing (CFHP)	Configure CFHP	Class fair hierarchical policing (CFHP)

Conventions

This section describes the general conventions used in this guide.

Precautionary and information messages

The following information symbols are used in the documentation.

DANGER: Danger warns that the described activity or situation may result in serious personal injury or death. An electric shock hazard could exist. Before you begin work on this equipment, be aware of hazards involving electrical circuitry, be familiar with networking environments, and implement accident prevention procedures.

WARNING: Warning indicates that the described activity or situation may, or will, cause equipment damage, serious performance problems, or loss of data.

Caution: Caution indicates that the described activity or situation may reduce your component or system performance.

Note: Note provides additional operational information.

Tip: Tip provides suggestions for use or best practices.

Options or substeps in procedures and sequential workflows

Options in a procedure or a sequential workflow are indicated by a bulleted list. In the following example, at step 1, the user must perform the described action. At step 2, the user must perform one of the listed options to complete the step.

Options in a procedure

User must perform this step.
This step offers three options. User must perform one option to complete this step.
- This is one option.
- This is another option.
- This is yet another option.

Substeps in a procedure or a sequential workflow are indicated by letters. In the following example, at step 1, the user must perform the described action. At step 2, the user must perform two substeps (a. and b.) to complete the step.

Substeps in a procedure

User must perform this step.
User must perform all substeps to complete this action.
1. This is one substep.
2. This is another substep.