Table of Contents - JUNOS 9.6 Class of Service Configuration Guide

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About This Guide

JUNOS Documentation and Release Notes

Objectives

Audience

Supported Platforms

Using the Indexes

Using the Examples in This Manual

Documentation Conventions

Documentation Feedback

Requesting Technical Support

CoS Overview

Packet Flow Across a Network

JUNOS CoS Components

Default CoS Settings

CoS Inputs and Outputs

Packet Flow Within Routers

Packet Flow on Juniper Networks J Series Services Routers

Packet Flow on Juniper Networks M Series Multiservice Edge Routers

Incoming I/O Manager ASIC
Internet Processor ASIC
Outgoing I/O Manager ASIC
Enhanced CFEB and CoS on M7i and M10i Multiservice Edge Routers

Packet Flow on MX Series Ethernet Services Routers

Packet Flow on Juniper Networks T Series Core Routers

Incoming Switch Interface ASICs
T Series Routers Internet Processor ASIC
Queuing and Memory Interface ASICs
Outgoing Switch Interface ASICs

Packet Flow Through the CoS Process

CoS Applications

Interface Types That Do Not Support CoS

VPLS and Default CoS Classification

Class of Service Configuration Statements

[edit chassis] Hierarchy Level
[edit class-of-service] Hierarchy Level
[edit firewall] Hierarchy Level
[edit interfaces] Hierarchy Level
[edit services cos] Hierarchy Level

Hardware Capabilities and Routing Engine Protocol Queue Assignments

Hardware Capabilities and Limitations

M320 Routers FPCs and CoS

MX Series Router CoS Hardware Capabilities and Limitations

Default Routing Engine Protocol Queue Assignments

Changing the Routing Engine Outbound Traffic Defaults

Comparing M320 and T Series Routers and IQ, IQ2, and Enhanced IQ PICs

CoS Features of the PIC Families
Scheduling on the PIC Families
Schedulers on the PIC Families
Queuing Parameters for the PIC Families

CoS Configuration

Defining Code-Point Aliases

Default Code Point Aliases
Defining Code Point Aliases for Bit Patterns

Classifying Packets by Behavior Aggregate

Classifier Types

Default Behavior Aggregate Classification

Default IP Precedence Classifier (ipprec-compatibility)
Default MPLS EXP Classifier
Default DSCP and DSCP IPv6 Classifier
Default IEEE 802.1p Classifier
Default IEEE 802.1ad Classifier
Default IP Precedence Classifier (ipprec-default)

Defining Classifiers

Importing a Classifier

Applying Classifiers to Logical Interfaces

Configuring BA Classifiers for Bridged Ethernet

Tunneling and BA Classifiers

Applying DSCP IPv6 Classifiers

Applying MPLS EXP Classifiers to Routing Instances

Configuring Global Classifiers and Wildcard Routing Instances
Examples: Applying MPLS EXP Classifiers to Routing Instances

Applying MPLS EXP Classifiers for Explicit-Null Labels

Setting Packet Loss Priority

Example: Overriding the Default PLP on M320 Routers

Configuring and Applying IEEE 802.1ad Classifiers

Defining Custom IEEE 802.1ad Maps
Applying Custom IEEE 802.1ad Maps
Verifying Custom IEEE 802.1ad Map Configuration

BA Classifiers and ToS Translation Tables

Classifying Packets Based on Various Packet Header Fields

Configuring Multifield Classifiers

Example: Classifying Packets Based on Their Destination Address

Example: Configuring and Verifying a Complex MF Filter

Configuring a Complex MF Filter
Verifying MF Classification

Example: Writing Different DSCP and EXP Values in MPLS-Tagged IP Packets

Example: Configuring a Simple Filter

Configuring Logical Bandwidth Policers

Example: Configuring a Logical Bandwidth Policer

Two-Color Policers and Shaping Rate Changes

Configuring CoS on Services PICs

Configuring CoS Rules

Configuring Match Conditions in a CoS Rule

Configuring Actions in a CoS Rule

Configuring Application Profiles
Configuring Reflexive and Reverse CoS Actions

Configuring CoS Rule Sets

Output Packet Rewriting

Allocating Excess Bandwidth Among Frame Relay DLCIs on MultiServices PICs

MultiServices PIC ToS Translation

Example: Configuring CoS Rules

Verifying CoS Configuration for Services PICs

Configuring Forwarding Classes

Default Forwarding Classes

Configuring Forwarding Classes

Applying Forwarding Classes to Interfaces

Classifying Packets by Egress Interface

Overriding Fabric Priority Queuing

Configuring Up to 16 Forwarding Classes

Enabling Eight Queues on Interfaces
Multiple Forwarding Classes and Default Forwarding Classes
PICs Restricted to Four Queues
Examples: Configuring Up to 16 Forwarding Classes

Configuring Forwarding Policy Options

Configuring CoS-Based Forwarding
Overriding the Input Classification
Example: Configuring CoS-Based Forwarding
Example: Configuring CoS-Based Forwarding for Different Traffic Types
Example: Configuring CoS-Based Forwarding for IPv6

Configuring RED Drop Profiles

Default Drop Profile
Configuring RED Drop Profiles
Packet Loss Priority
Example: Configuring RED Drop Profiles
Configuring Weighted RED Buffer Occupancy
Example: Configuring Weighted RED Buffer Occupancy

Configuring Schedulers

Overview of Schedulers

Default Schedulers

Configuring Schedulers

Configuring the Scheduler Buffer Size

Configuring Large Delay Buffers for Slower Interfaces

Maximum Delay Buffer for NxDS0 Interfaces
Example: Configuring Large Delay Buffers for Slower Interfaces

Enabling and Disabling the Memory Allocation Dynamic per Queue

Configuring Drop Profile Maps for Schedulers

Configuring Scheduler Transmission Rate

Example: Configuring Scheduler Transmission Rate
Allocation of Leftover Bandwidth

Priority Scheduling Overview

Platform Support for Priority Scheduling

Configuring Schedulers for Priority Scheduling

Example: Configuring Priority Scheduling
Configuring Strict-High Priority on M Series and T Series Routers

Configuring Scheduler Maps

Applying Scheduler Maps Overview

Applying Scheduler Maps to Physical Interfaces

Applying Scheduler Maps and Shaping Rate to Physical Interfaces on IQ PICs

Shaping Rate Calculations
Examples: and Shaping Rate to Physical Interfaces

Applying Scheduler Maps and Shaping Rate to DLCIs and VLANs

Example: to a DLCI or VLAN

Oversubscribing Interface Bandwidth

Verifying Configuration of Bandwidth Oversubscription
Examples: Oversubscribing Interface Bandwidth

Providing a Guaranteed Minimum Rate

Verifying Configuration of Guaranteed Minimum Rate
Example: Providing a Guaranteed Minimum Rate

Applying Scheduler Maps to Packet Forwarding Component Queues

Applying Custom Schedulers to Packet Forwarding Component Queues
Examples: Scheduling Packet Forwarding Component Queues

Default Fabric Priority Queuing

Associating Schedulers with Fabric Priorities

Example: Associating a Scheduler with a Fabric Priority

Configuring the Number of Schedulers for Ethernet IQ2 PICs

Ethernet IQ2 PIC Schedulers
Example: Configuring a Scheduler Number for an Ethernet IQ2 PIC Port

Ethernet IQ2 PIC RTT Delay Buffer Values

Configuring Per-Unit Schedulers for Channelized Interfaces

Configuring Rate Limiting and Sharing of Excess Bandwidth on MultiServices PICs

Configuring Tricolor Marking Policers

Platform Support for Tricolor Marking

Tricolor Marking Architecture

Configuring Tricolor Marking

Tricolor Marking Limitations

Configuring Single-Rate Tricolor Marking

Configuring Color-Blind Mode for Single-Rate Tricolor Marking

Configuring Color-Aware Mode for Single-Rate Tricolor Marking

Effect on Low PLP of Single-Rate Policer
Effect on Medium-Low PLP of Single-Rate Policer
Effect on Medium-High PLP of Single-Rate Policer
Effect on High PLP of Single-Rate Policer

Configuring Two-Rate Tricolor Marking

Configuring Color-Blind Mode for Two-Rate Tricolor Marking

Configuring Color-Aware Mode for Two-Rate Tricolor Marking

Effect on Low PLP of Two-Rate Policer
Effect on Medium-Low PLP of Two-Rate Marking Policer
Effect on Medium-High PLP of Two-Rate Policer
Effect on High PLP of Two-Rate Policer

Enabling Tricolor Marking

Configuring Tricolor Marking Policers

Applying Tricolor Marking Policers to Firewall Filters

Example: Applying a Two-Rate Tricolor Marking Policer to a Firewall Filter

Applying Firewall Filter Tricolor Marking Policers to Interfaces

Example: Applying a Single-Rate Tricolor Marking Policer to an Interface

Applying Layer 2 Policers to Gigabit Ethernet Interfaces

Examples: Applying Layer 2 Policers to a Gigabit Ethernet Interface

Using BA Classifiers to Set PLP

Using Multifield Classifiers to Set PLP

Configuring PLP for Drop-Profile Maps

Configuring Rewrite Rules Based on PLP

Verifying Tricolor Marking Configuration

Example: Configuring Two-Rate Tricolor Marking

Applying a Policer to the Input Interface
Applying Profiles to the Output Interface
Marking Packets with Medium-Low Loss Priority

Configuring CoS on Ethernet IQ2 and Enhanced IQ2 PICs

CoS on Enhanced IQ2 PICs Overview

Setting the Number of Egress Queues on IQ2 and Enhanced IQ2 PICs

Configuring Rate Limits on IQ2 and Enhanced IQ2 PICs

Configuring Shaping on 10-Gigabit Ethernet IQ2 PICs

Differences Between Gigabit Ethernet IQ and Gigabit Ethernet IQ2 PICs

Configuring Traffic Control Profiles for Shared Scheduling and Shaping

Differences Between Per-Unit Scheduling and Shared Scheduling

Configuring a Separate Input Scheduler for Each Interface

Configuring Hierarchical Input Shapers

Examples: Shaping Input and Output Traffic on Ethernet IQ2 Interfaces

Configuring a CIR and a PIR
Configuring Shared Resources

Rewriting Packet Header Information

Applying Default Rewrite Rules

Configuring Rewrite Rules

Bits Preserved, Cleared, and Rewritten

Applying Rewrite Rules to Output Logical Interfaces

Applying IEEE 802.1p Rewrite Rules to Dual VLAN Tags

Example: Applying an IEEE 802.1p Rewrite Rule to Dual VLAN Tags

Applying IEEE 802.1ad Rewrite Rules to Dual VLAN Tags

Example: Applying an IEEE 802.1ad Rewrite Rule to Dual VLAN Tags

Per-Node Rewriting of EXP Bits

Example: Rewriting EXP Bits on a Particular Node

Rewriting MPLS and IPv4 Packet Headers

Example: Rewriting MPLS and IPv4 Packet Headers

Rewriting the EXP Bits of All Three Labels of an Outgoing Packet

Example: Rewriting the EXP Bits of All Three Labels of an Outgoing Packet

Rewriting IEEE 802.1p Packet Headers with an MPLS EXP Value

Setting Ingress DSCP Bits for Multicast Traffic over Layer 3 VPNs

Configuring Fragmentation by Forwarding Class

Configuring Fragmentation by Forwarding Class
Associating a Fragmentation Map with an MLPPP Interface or MLFR FRF.16 DLCI
Example: Configuring Fragmentation by Forwarding Class
Example: Configuring Drop Timeout Interval by Forwarding Class

Configuring CoS for Tunnels

Configuring CoS for Tunnels
Example: Configuring CoS for Tunnels
Example: Configuring a GRE Tunnel to Copy ToS Bits to the Outer IP Header

Configuring Hierarchical Schedulers

Configuring Hierarchical Schedulers for CoS

Hierarchical Schedulers Terminology

Configuring Interface Sets

Applying Interface Sets

Interface Set Caveats

Hierarchical Schedulers and Traffic Control Profiles

Example: Four-Level Hierarchy of Schedulers

Configuring the Interface Sets
Configuring the Interfaces
Configuring the Traffic Control Profiles
Configuring the Schedulers
Configuring the Drop Profiles
Configuring the Scheduler Maps
Applying the Traffic Control Profiles

Controlling Remaining Traffic

Configuring Internal Scheduler Nodes

PIR-Only and CIR Mode

Priority Propagation

Configuring CoS on Enhanced Queuing DPCs

Enhanced Queuing DPC Hardware Properties

Configuring Rate Limits on Enhanced Queuing DPCs

Configuring Simple Filters on Enhanced Queuing DPCs

Configuring WRED on Enhanced Queuing DPCs

Configuring MDRR on Enhanced Queuing DPCs

Configuring Excess Bandwidth Sharing

Excess Bandwidth Sharing and Minimum Logical Interface Shaping
Selecting Excess Bandwidth Sharing Proportional Rates
Mapping Calculated Weights to Hardware Weights
Allocating Weight with Only Shaping Rates or Unshaped Logical Interfaces
Sharing Bandwidth Among Logical Interfaces

Configuring Ingress Hierarchical CoS on Enhanced Queuing DPCs

Configuring CoS on Enhanced IQ PICs

Platforms that Support CoS on IQE PICs

Configuring ToS Translation Tables

Configuring Excess Bandwidth Sharing on IQE PICs

IQE PIC Excess Bandwidth Sharing Overview
IQE PIC Excess Bandwidth Sharing Configuration

Calculation of Expected Traffic on IQE PIC Queues

Excess Bandwidth Calculations Terminology
Excess Bandwidth Basic Example
Logical Interface Modes on IQE PICs
Default Rates for Queues on IQE PICs
Sample Calculations of Excess Bandwidth Sharing on IQE PICs

Configuring Layer 2 Policing on IQE PICs

Layer 2 Policer Limitations
Configuring Layer 2 Policers on IQE PICs

Configuring Low-Latency Static Policers on IQE PICs

Configuring Queue-Level Bandwidth Sharing

Overview of Bandwidth Sharing on Nonqueuing Packet Forwarding Engines
Configuring Rate Limits on Nonqueuing Packet Forwarding Engines
Excess Rate and Excess Priority Configuration Examples

Configuring Schedulers on Aggregated Ethernet and SONET/SDH Interfaces

Configuring Schedulers on Aggregated Interfaces
Limitations on CoS for Aggregated Interfaces
Examples: Configuring CoS on Aggregated Interfaces
Configuring Scheduling Modes on Aggregated Interfaces

Configuring CoS on ATM Interfaces

Configuring Linear RED Profiles on ATM Interfaces

Configuring Scheduler Maps on ATM Interfaces

Enabling Eight Queues on ATM2 IQ Interfaces

Example: Enabling Eight Queues on ATM2 IQ Interfaces

Verifying the Configuration

Configuring VC CoS Mode on ATM Interfaces

Copying the PLP Setting to the CLP Bit on ATM Interfaces

Applying Scheduler Maps to Logical ATM Interfaces

Example: Configuring CoS for ATM2 IQ VC Tunnels

Configuring CoS for L2TP Tunnels on ATM Interfaces

Configuring IEEE 802.1p BA Classifiers for Ethernet VPLS Over ATM

Configuring CoS for MPLS

CoS for MPLS Overview
Configuring CoS for MPLS Traffic

CoS Configuration Examples

Example: Configuring Classifiers, Rewrite Markers, and Schedulers
Example: Configuring a CoS Policy for IPv6 Packets

Summary of CoS Configuration Statements

action

address

application-profile

application-sets

applications

atm-options

atm-scheduler-map

buffer-size

cbr

class

class (CoS-Based Forwarding)
class (Forwarding Classes)

class-of-service

classification-override

classifiers

classifiers (Application)
classifiers (Application for Routing Instances)
classifiers (Definition)

code-point

code-point-aliases

code-points

copy-tos-to-outer-ip-header

data

delay-buffer-rate

destination

destination-address

discard

drop-probability

drop-probability (Interpolated Value)
drop-probability (Percentage)

dscp (AS PIC Classifiers)
dscp (Multifield Classifier)
dscp (Rewrite Rules)

dscp-code-point

dscp-ipv6

egress-shaping-overhead

epd-threshold

excess-bandwith-share

excess-priority

excess-rate

exp

exp-push-push-push

exp-swap-push-push

fabric

family

family (CoS on ATM Interfaces)
family (Multifield [MF] Classifier)

fill-level

fill-level (Interpolated Value)
fill-level (Percentage)

filter

filter (Applying to an Interface)
filter (Configuring)

firewall

forwarding-class

forwarding-class (AS PIC Classifiers)
forwarding-class (ATM2 IQ Scheduler Maps)
forwarding-class (BA Classifiers)
forwarding-class (Forwarding Policy)
forwarding-class (Fragmentation)
forwarding-class (Interfaces)
forwarding-class (MF Classifiers)
forwarding-class (Restricted Queues)

forwarding-classes

forwarding-classes-interface-specific

forwarding-policy

fragment-threshold

fragmentation-map

fragmentation-maps

from

ftp

guaranteed-rate

hierarchical-scheduler

high-plp-max-threshold

high-plp-threshold

host-outbound-traffic

import (Classifiers)
import (Rewrite Rules)

inet-precedence

ingress-shaping-overhead

input-excess-bandwith-share

input-policer

input-scheduler-map

input-shaping-rate

input-shaping-rate (Logical Interface)
input-shaping-rate (Physical Interface)

input-three-color

input-traffic-control-profile

input-traffic-control-profile-remaining

linear-red-profile

linear-red-profiles

logical-bandwidth-policer

logical-interface-policer

loss-priority

loss-priority (BA Classifiers)
loss-priority (Normal Filter)
loss-priority (Rewrite Rules)
loss-priority (Scheduler Drop Profiles)
loss-priority (Simple Filter)

low-plp-max-threshold

low-plp-threshold

lsp-next-hop

match-direction

max-queues-per-interface

member-link-scheduler

output-forwarding-class-map

output-policer

output-three-color

output-traffic-control-profile

output-traffic-control-profile-remaining

per-session-scheduler

per-unit-scheduler

plp-to-clp

policer

policer (Applying to an Interface)
policer (Configuring)

priority

priority (ATM2 IQ Schedulers)
priority (Fabric Queues, Schedulers)
priority (Fabric Priority)
priority (Schedulers)

protocol

protocol (Rewrite Rules)
protocol (Schedulers)

q-pic-large-buffer

queue

queue (Global Queues)
queue (Restricted Queues)

queue-depth

red-buffer-occupancy

(reflexive | reverse)

restricted-queues

rewrite-rules

rewrite-rules (Definition)
rewrite-rules (Interfaces)

routing-instances

scheduler (Fabric Queues)
scheduler (Scheduler Map)

scheduler-map

scheduler-map (Fabric Queues)
scheduler-map (Interfaces and Traffic-Control Profiles)

scheduler-map-chassis

scheduler-maps

scheduler-maps (For ATM2 IQ Interfaces)
scheduler-maps (For Most Interface Types)

schedulers

schedulers (Class-of-Service)
schedulers (Interfaces)

services

shaping

shaping-rate

shaping-rate (Applying to an Interface)
shaping-rate (Limiting Excess Bandwidth Usage)
shaping-rate (Oversubscribing an Interface)

shared-instance

shared-scheduler

simple-filter

simple-filter (Applying to an Interface)
simple-filter (Configuring)

term (AS PIC Classifiers)
term (Normal Filter)
term (Simple Filter)

then

three-color-policer

three-color-policer (Applying)
three-color-policer (Configuring)

traffic-control-profiles

traffic-manager

translation-table

Index
Index of Statements and Commands

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