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CoS Overview
Overview of Junos OS CoS for the QFX Series and EX4600 Switch Overview of Policers Understanding Junos CoS Components Understanding CoS Packet Flow CoS Inputs and Outputs Overview Understanding Default CoS Settings Understanding Host Inbound Traffic Classification Understanding Host Routing Engine Outbound Traffic Queues and Defaults Understanding CoS Code-Point Aliases Understanding CoS Classifiers Understanding CoS MPLS EXP Classifiers and Rewrite Rules Understanding Applying CoS Classifiers and Rewrite Rules to Interfaces Understanding CoS Forwarding Classes Understanding CoS Forwarding Class Sets (Priority Groups) Understanding Default CoS Scheduling and Classification Understanding CoS Hierarchical Port Scheduling (ETS) Understanding CoS Output Queue Schedulers Understanding CoS Priority Group Scheduling Understanding CoS Traffic Control Profiles Understanding CoS Priority Group and Queue Guaranteed Rates (Minimum Bandwidth) Understanding CoS Priority Group Shaping and Queue Shaping (Maximum Bandwidth) Understanding CoS Scheduling Behavior and Configuration Considerations Understanding CoS Buffer Configuration Understanding CoS WRED Drop Profiles Understanding CoS Rewrite Rules Understanding CoS Flow Control (Ethernet PAUSE and PFC) Understanding CoS Explicit Congestion Notification Understanding PFC Functionality Across Layer 3 Interfaces

CoS Overview

Overview of Junos OS CoS for the QFX Series and EX4600 Switch

Overview of Policers

Understanding Junos CoS Components

Understanding CoS Packet Flow

CoS Inputs and Outputs Overview

Understanding Default CoS Settings

Understanding Host Inbound Traffic Classification

Understanding Host Routing Engine Outbound Traffic Queues and Defaults

Understanding CoS Code-Point Aliases

Understanding CoS Classifiers

Understanding CoS MPLS EXP Classifiers and Rewrite Rules

Understanding Applying CoS Classifiers and Rewrite Rules to Interfaces

Understanding CoS Forwarding Classes

Understanding CoS Forwarding Class Sets (Priority Groups)

Understanding Default CoS Scheduling and Classification

Understanding CoS Hierarchical Port Scheduling (ETS)

Understanding CoS Output Queue Schedulers

Understanding CoS Priority Group Scheduling

Understanding CoS Traffic Control Profiles

Understanding CoS Priority Group and Queue Guaranteed Rates (Minimum Bandwidth)

Understanding CoS Priority Group Shaping and Queue Shaping (Maximum Bandwidth)

Understanding CoS Scheduling Behavior and Configuration Considerations

Understanding CoS Buffer Configuration

Understanding CoS WRED Drop Profiles

Understanding CoS Rewrite Rules

Understanding CoS Flow Control (Ethernet PAUSE and PFC)

Understanding CoS Explicit Congestion Notification

Understanding PFC Functionality Across Layer 3 Interfaces

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Learn About: Data Center Bridging

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Configuration Examples
Example: Configuring CoS Hierarchical Port Scheduling (ETS) Example: Configuring Unicast Classifiers Example: Configuring Multidestination (Multicast, Broadcast, DLF) Classifiers Example: Configuring WRED Drop Profiles Example: Configuring Drop Profile Maps Example: Configuring Forwarding Classes Example: Configuring Forwarding Class Sets Example: Configuring Queue Schedulers Example: Configuring Queue Scheduling Priority Example: Configuring ECN Example: Configuring Traffic Control Profiles (Priority Group Scheduling) Example: Configuring Minimum Guaranteed Output Bandwidth Example: Configuring Maximum Output Bandwidth Example: Recommended Configuration of the Shared Buffer Pool for Networks with Mostly Best-Effort Unicast Traffic Example: Recommended Configuration of the Shared Buffer Pool for Networks with Mostly Best-Effort Traffic on Links with Ethernet PAUSE Enabled Example: Recommended Configuration of the Shared Buffer Pool for Networks with Mostly Multicast Traffic Example: Recommended Configuration of the Shared Buffer Pool for Networks with Mostly Lossless Traffic

Configuration Examples

Example: Configuring CoS Hierarchical Port Scheduling (ETS)

Example: Configuring Unicast Classifiers

Example: Configuring Multidestination (Multicast, Broadcast, DLF) Classifiers

Example: Configuring WRED Drop Profiles

Example: Configuring Drop Profile Maps

Example: Configuring Forwarding Classes

Example: Configuring Forwarding Class Sets

Example: Configuring Queue Schedulers

Example: Configuring Queue Scheduling Priority

Example: Configuring ECN

Example: Configuring Traffic Control Profiles (Priority Group Scheduling)

Example: Configuring Minimum Guaranteed Output Bandwidth

Example: Configuring Maximum Output Bandwidth

Example: Recommended Configuration of the Shared Buffer Pool for Networks with Mostly Best-Effort Unicast Traffic

Example: Recommended Configuration of the Shared Buffer Pool for Networks with Mostly Best-Effort Traffic on Links with Ethernet PAUSE Enabled

Example: Recommended Configuration of the Shared Buffer Pool for Networks with Mostly Multicast Traffic

Example: Recommended Configuration of the Shared Buffer Pool for Networks with Mostly Lossless Traffic

Configuration Examples
Example: Configuring PFC Across Layer 3 Interfaces

Configuration Tasks
Configuring CoS Defining CoS Code-Point Aliases Defining CoS Unicast BA Classifiers (DSCP, DSCP IPv6, IEEE 802.1p) Configuring a Global MPLS EXP Classifier Defining CoS Multidestination (Multicast, Broadcast, DLF) BA Classifiers Configuring CoS WRED Drop Profiles Configuring CoS Drop Profile Maps Defining CoS Forwarding Classes Defining CoS Forwarding Class Sets Defining CoS Queue Schedulers Defining CoS Queue Scheduling Priority Changing the Host Outbound Traffic Default Queue Mapping Defining CoS Traffic Control Profiles (Priority Group Scheduling) Configuring CoS PFC (Congestion Notification Profiles) Enabling and Disabling CoS Symmetric Ethernet PAUSE Flow Control Configuring CoS Asymmetric Ethernet PAUSE Flow Control Configuring Global Ingress and Egress Shared Buffers Defining CoS Rewrite Rules Configuring Rewrite Rules for MPLS EXP Classifiers Assigning CoS Components to Interfaces

Configuration Tasks

Configuring CoS

Defining CoS Code-Point Aliases

Defining CoS Unicast BA Classifiers (DSCP, DSCP IPv6, IEEE 802.1p)

Configuring a Global MPLS EXP Classifier

Defining CoS Multidestination (Multicast, Broadcast, DLF) BA Classifiers

Configuring CoS WRED Drop Profiles

Configuring CoS Drop Profile Maps

Defining CoS Forwarding Classes

Defining CoS Forwarding Class Sets

Defining CoS Queue Schedulers

Defining CoS Queue Scheduling Priority

Changing the Host Outbound Traffic Default Queue Mapping

Defining CoS Traffic Control Profiles (Priority Group Scheduling)

Configuring CoS PFC (Congestion Notification Profiles)

Enabling and Disabling CoS Symmetric Ethernet PAUSE Flow Control

Configuring CoS Asymmetric Ethernet PAUSE Flow Control

Configuring Global Ingress and Egress Shared Buffers

Defining CoS Rewrite Rules

Configuring Rewrite Rules for MPLS EXP Classifiers

Assigning CoS Components to Interfaces

Configuration Statements
buffer-partition (Egress) buffer-partition (Ingress) buffer-size cable-length (Congestion Notification) class-of-service class (Forwarding Classes) class (Forwarding Class Sets) classifiers code-point (Input Congestion Notification) code-point (Output Congestion Notification) code-point (Rewrite Rules) code-point-aliases code-points (Application Maps) code-points (CoS) configured-flow-control congestion-notification-profile drop-probability drop-profile drop-profile-map drop-profiles dscp dscp-ipv6 dscp-code-point egress (Buffer Configuration) enhanced-transmission-selection exp explicit-congestion-notification fill-level flow-control flow-control-queue (Output Congestion Notification) forwarding-class forwarding-class (Host Outbound Traffic) forwarding-class-set forwarding-class-sets forwarding-classes guaranteed-rate host-outbound-traffic ieee-802.1 ieee-802.1 (Input Congestion Notification) ieee-802.1 (Output Congestion Notification) import ingress (Buffer Configuration) input (Congestion Notification) interfaces (Class of Service) interpolate loss-priority (Classifiers) loss-priority (Drop Profiles) loss-priority (Rewrite Rules) multi-destination mru output (Congestion Notification) output-traffic-control-profile pfc (Input Congestion Notification) policy-options priority (Schedulers) priority-flow-control protocol (Drop Profile Map) queue-num rewrite-rules rx-buffers scheduler scheduler-map scheduler-maps schedulers shaping-rate shared-buffer system-defaults traceoptions (Class of Service) traffic-control-profiles transmit-rate tx-buffers unit

Configuration Statements

buffer-partition (Egress)

buffer-partition (Ingress)

buffer-size

cable-length (Congestion Notification)

class-of-service

class (Forwarding Classes)

class (Forwarding Class Sets)

classifiers

code-point (Input Congestion Notification)

code-point (Output Congestion Notification)

code-point (Rewrite Rules)

code-point-aliases

code-points (Application Maps)

code-points (CoS)

configured-flow-control

congestion-notification-profile

egress (Buffer Configuration)

enhanced-transmission-selection

exp

explicit-congestion-notification

fill-level

flow-control

flow-control-queue (Output Congestion Notification)

forwarding-class

forwarding-class (Host Outbound Traffic)

forwarding-class-set

forwarding-class-sets

forwarding-classes

guaranteed-rate

host-outbound-traffic

ieee-802.1

ieee-802.1 (Input Congestion Notification)

ieee-802.1 (Output Congestion Notification)

import

ingress (Buffer Configuration)

input (Congestion Notification)

interfaces (Class of Service)

interpolate

loss-priority (Classifiers)

loss-priority (Drop Profiles)

loss-priority (Rewrite Rules)

multi-destination

mru

output (Congestion Notification)

output-traffic-control-profile

pfc (Input Congestion Notification)

policy-options

priority (Schedulers)

priority-flow-control

protocol (Drop Profile Map)

traceoptions (Class of Service)

traffic-control-profiles

transmit-rate

tx-buffers

unit

Routine Monitoring
Monitoring CoS Classifiers Monitoring CoS Forwarding Classes Monitoring Interfaces That Have CoS Components Monitoring CoS Rewrite Rules Monitoring CoS Scheduler Maps Monitoring CoS Value Aliases

Routine Monitoring

Monitoring CoS Classifiers

Monitoring CoS Forwarding Classes

Monitoring Interfaces That Have CoS Components

Monitoring CoS Rewrite Rules

Monitoring CoS Scheduler Maps

Monitoring CoS Value Aliases

Operational Commands
show class-of-service show class-of-service classifier show class-of-service code-point-aliases show class-of-service congestion-notification show class-of-service drop-profile show class-of-service forwarding-class show class-of-service forwarding-class-set show class-of-service forwarding-table show class-of-service forwarding-table classifier show class-of-service forwarding-table classifier mapping show class-of-service forwarding-table drop-profile show class-of-service forwarding-table rewrite-rule show class-of-service forwarding-table rewrite-rule mapping show class-of-service forwarding-table scheduler-map show class-of-service interface show class-of-service multi-destination show class-of-service rewrite-rule show class-of-service scheduler-map show class-of-service shared-buffer show class-of-service traffic-control-profile show dcbx show dcbx neighbors show interfaces queue show pfe next-hop show pfe route show pfe terse show pfe version

Operational Commands

show class-of-service

show class-of-service classifier

show class-of-service code-point-aliases

show class-of-service congestion-notification

show class-of-service drop-profile

show class-of-service forwarding-class

show class-of-service forwarding-class-set

show class-of-service forwarding-table

show class-of-service forwarding-table classifier

show class-of-service forwarding-table classifier mapping

show class-of-service forwarding-table drop-profile

show class-of-service forwarding-table rewrite-rule

show class-of-service forwarding-table rewrite-rule mapping

show class-of-service forwarding-table scheduler-map

show class-of-service interface

show class-of-service multi-destination

show class-of-service rewrite-rule

show class-of-service scheduler-map

show class-of-service shared-buffer

show class-of-service traffic-control-profile

show dcbx

show dcbx neighbors

show interfaces queue

Troubleshooting Procedures
Troubleshooting Dropped FCoE Traffic Troubleshooting Egress Bandwidth That Exceeds the Configured Maximum Bandwidth Troubleshooting Egress Bandwidth That Exceeds the Configured Minimum Bandwidth Troubleshooting Egress Queue Bandwidth Impacted by Congestion Troubleshooting an Unexpected Rewrite Value

Troubleshooting Procedures

Troubleshooting Dropped FCoE Traffic

Troubleshooting Egress Bandwidth That Exceeds the Configured Maximum Bandwidth

Troubleshooting Egress Bandwidth That Exceeds the Configured Minimum Bandwidth

Troubleshooting Egress Queue Bandwidth Impacted by Congestion

Troubleshooting an Unexpected Rewrite Value

Supported Platforms

EX Series

TechLibrary

Traffic Management on EX4600

Supported Platforms

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