Table of Contents - JUNOS 9.4 Class of Service Configuration Guide

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About This Guide

Objectives

Audience

Supported Platforms

Using the Indexes

Using the Examples in This Manual

Documentation Conventions

List of Technical Publications

Documentation Feedback

Requesting Technical Support

CoS Overview

Packet Flow Across a Network

JUNOS CoS Components

Default CoS

CoS Inputs and Outputs

Packet Flow Within Routing Platforms

Packet Flow on J-series Platforms

Packet Flow on M-series Platforms

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

Packet Flow on MX-series Platforms

Packet Flow on T-series Platforms

Incoming Switch Interface ASICs
T-series 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 FPCs and CoS

MX-series CoS Hardware Capabilities and Limitations

Default Routing Engine Protocol Queue Assignments

Changing the Routing Engine Outbound Traffic Defaults

Comparing the M320, T-series, 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 Aliases for Bits

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 a Classifier to a Logical Interface

Bridging and BA Classifiers

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 the PLP on T320 and M320 Platforms

Example: Overriding the Default PLP on M320 Platforms

Classifying Frame Relay Traffic

Assigning the Default Frame Relay Loss Priority Map to an Interface

Defining a Custom Frame Relay Loss Priority Map

Applying the Map to a Logical Interface

Verifying Your Configuration

Applying IEEE 802.1ad Classification

Defining a Custom IEEE 802.1ad Map
Applying a Custom IEEE 802.1ad Map
Verifying a Custom IEEE 802.1ad Map

Configuring ToS Translation Tables

Classifying Packets Based on Various Packet Header Fields

Classifying Packets Based on Multiple Fields

Example: Classifying Packets Based on a Destination Address

Example: Configuring and Confirming a Complex MF Filter

Configuring a Complex MF Filter
Confirming MF Classification

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

Example: Configuring a Simple Filter

Configuring a Logical Bandwidth Policer

Example: Configuring a Logical Bandwidth Policer

Classifying Packets Based on Services

Configuring the Class-of-Service Rule Set

Configuring Class-of-Service Rule Content

Configuring Class-of-Service Match Conditions

Configuring Class-of-Service Actions

Configuring Application Profiles
Configuring Reflexive and Reverse CoS Actions

Output Packet Rewriting

Example: Configuring Class-of-Service Properties

Verifying Your Configuration

Configuring Forwarding Classes

Default Forwarding Classes

Configuring Forwarding Classes

Assigning a Forwarding Class to an 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 Up to Eight Forwarding Classes

Examples: Configuring Up to Eight 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
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 the RED Buffer Occupancy Weight
Examples: Configuring the RED Buffer Occupancy Weight

Configuring Schedulers

Overview of Schedulers

Default Schedulers

Configuring a Scheduler

Configuring the Scheduler Drop Profile Map

Configuring the Transmission Rate

Example: Configuring the Transmission Rate
Allocation of Leftover Bandwidth

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 Priority Scheduling

Example: Configuring Priority Scheduling

Configuring Strict-High Priority on J-series Platforms

Example: Configuring Strict-High Priority on J-series Platforms

Configuring Strict-High Priority on M-series and T-series Platforms

Transmission Scheduling and Platform Differences

Configuring the Scheduler Map

Associating the Scheduler Map

Associating the Scheduler Map with a Physical Interface

Associating the Scheduler Map and a Shaping Rate with a Physical Interface

Shaping Rate Calculations
Examples: Associating a Scheduler Map and a Shaping Rate with a Physical Interface

Associating the Scheduler Map and a Shaping Rate with a DLCI or VLAN

Example: Associating the Scheduler Map Name with a DLCI or VLAN

Oversubscribing Interface Bandwidth

Verifying Your Configuration
Examples: Oversubscribing Interface Bandwidth

Providing a Guaranteed Minimum Rate

Verifying Your Configuration
Example: Providing a Guaranteed Minimum Rate

Associating the Scheduler Map with the Packet Forwarding Component Queues

Assigning a Custom Scheduler to the Packet Forwarding Component Queues
Examples: Scheduling Packet Forwarding Component Queues

Default Fabric Priority Queuing

Associating a Scheduler with a Fabric Priority

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

Excess Bandwidth and Rate Limiting on the MultiServices PIC

Configuring Tricolor Marking Policers

Supported Platforms for Tricolor Marking

Tricolor Marking Architecture

Configuring Tricolor Marking

Tricolor Marking Limitations

Color-Blind and Color-Aware Single-Rate Tricolor Marking

Single-Rate Tricolor Marking, Color-Blind Mode

Single-Rate Tricolor Marking, Color-Aware Mode

Incoming PLP Low
Incoming PLP Medium-Low
Incoming PLP Medium-High
Incoming PLP High

Color-Blind and Color-Aware Two-Rate Tricolor Marking

Two-Rate Tricolor Marking, Color-Blind Mode

Two-Rate Tricolor Marking, Color-Aware Mode

Incoming PLP Low
Incoming PLP Medium-Low
Incoming PLP Medium-High
Incoming PLP High

Enabling Tricolor Marking

Configuring a Tricolor Marking Policer

Applying a Tricolor Marking Policer to a Firewall Filter

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

Applying a Firewall Filter Tricolor Marking Policer to an Interface

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

Applying a Layer 2 Policer to a Gigabit Ethernet Interface

Examples: Applying Layer 2 Policers to a Gigabit Ethernet Interface

Setting the PLP with a BA Classifier

Setting the PLP with a Multifield Classifier

Associating the PLP with a Drop-Profile Map

Associating the PLP with a Rewrite Rule

Verifying Your Configuration

Example: Configuring Two-Rate Tricolor Marking

Input Interface
Output Interface
Medium-Low Loss Priority

Configuring CoS on Ethernet IQ2 Interfaces

Introduction to CoS on Ethernet IQ2 Interfaces

Configuring IQ2 PIC Rate Limits

Configuring Shaping on Ethernet IQ2 Interfaces

Differences Between Gigabit Ethernet IQ and Gigabit Ethernet IQ2 PICs

Configuring a Shared Scheduler and Shaper

Differences Between Per-Unit Scheduling and Shared Scheduling

Configuring Separate Input Schedulers

Configuring Hierarchical Input Shapers

Examples: Shaping Input and Output Traffic on Ethernet IQ2 Interfaces

Configuring a CIR and a PIR
Configuring Shared Resources

Configuring CoS on Enhanced IQ2 PICs

Configuring an Adaptive Shaper for a Frame Relay Interface

Adaptive Shaper for Frame Relay Overview
Configuring an Adaptive Shaper for Frame Relay
Applying an Adaptive Shaper to a Logical Interface

Configuring Virtual Channels

Configuring CoS Virtual Channels
Creating a List of Virtual Channel Names
Defining a Virtual Channel Group
Applying a Virtual Channel Group to a Logical Interface
Selecting Traffic to Be Transmitted from a Particular Virtual Channel
Example: Configuring Virtual Channels

Rewriting Packet Header Information

Applying a Default Rewrite Rule

Configuring Rewrite Rules

Bits Preserved, Cleared, and Rewritten

Assigning the Rewrite-Rules Configuration to the Output Logical Interface

Assigning the IEEE 802.1p Rewrite Rule to Dual VLAN Tags

Example: Assigning the IEEE 802.1p Rewrite Rule to Dual VLAN Tags

Assigning the IEEE 802.1ad Rewrite Rule to Dual VLAN Tags

Example: Assigning the IEEE 802.1ad Rewrite Rule to Dual VLAN Tags

Rewriting EXP Bits on a Particular Node

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 MPLS EXP Value

Rewriting Frame Relay Headers

Assigning the Default Frame Relay Rewrite Rule to an Interface

Defining a Custom Frame Relay Rewrite Rule

Applying the Rule to a Logical Interface

Setting Ingress DSCP Bits for Multicast Traffic over L3 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 CoS Hierarchical Schedulers

Configuring Hierarchical Schedulers for CoS

Hierarchical Schedulers Terminology

Configuring an Interface Set

Applying an Interface Set

Interface Set Caveats

Introduction to Hierarchical Schedulers

Scheduler Hierarchy Example

Interface Sets for the Hierarchical Example
Interfaces for the Hierarchical Example
Traffic Control Profiles for the Hierarchical Example
Schedulers for the Hierarchical Example
Drop Profiles for the Hierarchical Example
Scheduler Maps for the Hierarchical Example
Applying Traffic Control Profiles for the Hierarchical Example

Controlling Remaining Traffic

Internal Scheduler Nodes

PIR-Only and CIR Mode

Priority Propagation

Configuring CoS for Enhanced Queuing DPCs

Enhanced Queuing DPC Hardware Properties

Configuring Enhanced Queuing DPC Rate Limits

Simple Filters and the Enhanced Queuing DPC

WRED on the Enhanced Queuing DPC

MDRR on the Enhanced Queuing DPC

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

Ingress Hierarchical CoS for the Enhanced Queuing DPC

Configuring CoS on Enhanced IQ PICs

IQE PIC Interface Support

Configuring PIC ToS Translation

Configuring IQE PIC Excess Bandwidth Sharing

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

Calculating Traffic on an IQE PIC Queue

Excess Bandwidth Calculations Terminology
Excess Bandwidth Basic Example
Logical Interface Modes on the IQE PIC
Queue Default Rates for the IQE PIC
Examples of Excess Bandwidth Sharing Calculations on the IQE PIC

Configuring IQE PIC Layer 2 Policing

Configuring IQE PIC Low-Latency Static Policer

Configuring CoS Schedulers for Aggregated Ethernet and SONET/SDH Interfaces

Limitations for Configuring CoS for Aggregated Interfaces
Examples: Configuring CoS for Aggregated Ethernet and SONET/SDH Interfaces

Configuring CoS on ATM Interfaces

Configuring Linear RED Profiles

Configuring an ATM Scheduler Map

Enabling Eight Queues on ATM2 IQ Interfaces

Example: Enabling Eight Queues on ATM2 IQ Interfaces

Verifying the Configuration

Configuring VC CoS Mode

Enabling the PLP Setting to Be Copied to the CLP Bit

Configuring ATM CoS on the Logical Interface

Example: Configuring ATM2 IQ VC Tunnel CoS Components

Using CoS with ATM and L2TP Tunnels

IEEE 802.1p BA Classification for Ethernet VPLS Over ATM

Configuring CoS for MPLS

MPLS Class of Service
Configuring MPLS Class of Service

Additional CoS Configuration Examples

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

Summary of CoS Configuration Statements

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

code-points (Forwarding Class)
code-points (Frame Relay DE Bit Loss-Priority Map)

copy-tos-to-outer-ip-header

default

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-policy

fragment-threshold

fragmentation-map

fragmentation-maps

frame-relay-de

frame-relay-de (Assigning to an Interface)
frame-relay-de (Defining Loss Priority)
frame-relay-de (Defining Rewrite Rule)

from

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 (Frame Relay DE Bit Loss-Priority Map)
loss-priority (Normal Filter)
loss-priority (Rewrite Rules)
loss-priority (Scheduler Drop Profiles)
loss-priority (Simple Filter)

loss-priority-maps

loss-priority-maps (Assigning to an Interface)
loss-priority-maps (Defining)

low-plp-max-threshold

low-plp-threshold

lsp-next-hop

match-direction

max-queues-per-interface

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 (Virtual Channels)

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 (Adaptive Shaping)
shaping-rate (Applying to an Interface)
shaping-rate (Limiting Excess Bandwidth Usage)
shaping-rate (Oversubscribing an Interface)
shaping-rate (Virtual Channels)

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-tables

virtual-channel-group

virtual-channel-groups

virtual-channels

vlan-tag

Index

Index
Index of Statements and Commands

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