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Table of Contents
- play_arrow Overview
- play_arrow Understanding How Class of Service Manages Congestion and Defines Traffic Forwarding Behavior
- Understanding How Class of Service Manages Congestion and Controls Service Levels in the Network
- How CoS Applies to Packet Flow Across a Network
- The Junos OS CoS Components Used to Manage Congestion and Control Service Levels
- Mapping CoS Component Inputs to Outputs
- Default Junos OS CoS Settings
- Packet Flow Through the Junos OS CoS Process Overview
- Configuring Basic Packet Flow Through the Junos OS CoS Process
- Example: Classifying All Traffic from a Remote Device by Configuring Fixed Interface-Based Classification
- Interface Types That Do Not Support Junos OS CoS
-
- play_arrow Configuring Platform-Specific Functionality
- play_arrow Configuring Class of Service on ACX Series Universal Metro Routers
- CoS on ACX Series Routers Features Overview
- Understanding CoS CLI Configuration Statements on ACX Series Routers
- DSCP Propagation and Default CoS on ACX Series Routers
- Configuring CoS on ACX Series Routers
- Classifiers and Rewrite Rules at the Global, Physical, and Logical Interface Levels Overview
- Configuring Classifiers and Rewrite Rules at the Global and Physical Interface Levels
- Applying DSCP and DSCP IPv6 Classifiers on ACX Series Routers
- Schedulers Overview for ACX Series Routers
- Shared and Dedicated Buffer Memory Pools on ACX Series Routers
- CoS for PPP and MLPPP Interfaces on ACX Series Routers
- CoS for NAT Services on ACX Series Routers
- Hierarchical Class of Service in ACX Series Routers
- Storm Control on ACX Series Routers Overview
- play_arrow Configuring Class of Service on MX Series 5G Universal Routing Platforms
- Junos CoS on MX Series 5G Universal Routing Platforms Overview
- CoS Features and Limitations on MX Series Routers
- Configuring and Applying IEEE 802.1ad Classifiers
- Scheduling and Shaping in Hierarchical CoS Queues for Traffic Routed to GRE Tunnels
- Example: Performing Output Scheduling and Shaping in Hierarchical CoS Queues for Traffic Routed to GRE Tunnels
- CoS-Based Interface Counters for IPv4 or IPv6 Aggregate on Layer 2
- Enabling a Timestamp for Ingress and Egress Queue Packets
- play_arrow Configuring Class of Service on PTX Series Packet Transport Routers
- CoS Features and Limitations on PTX Series Routers
- CoS Feature Differences Between PTX Series Packet Transport Routers and T Series Routers
- Understanding Scheduling on PTX Series Routers
- Virtual Output Queues on PTX Series Packet Transport Routers
- Example: Configuring Excess Rate for PTX Series Packet Transport Routers
- Identifying the Source of RED Dropped Packets on PTX Series Routers
- Configuring Queuing and Shaping on Logical Interfaces on PTX Series Routers
- Example: Configuring Queuing and Shaping on Logical Interfaces in PTX Series Packet Transport Routers
- Example: Configuring Strict-Priority Scheduling on a PTX Series Router
- CoS Support on EVPN VXLANs
- Understanding CoS CLI Configuration Statements on PTX Series Routers
- Classification Based on Outer Header of Decapsulation Tunnel
-
- play_arrow Configuring Line Card-Specific and Interface-Specific Functionality
- play_arrow Feature Support of Line Cards and Interfaces
- play_arrow Configuring Class of Service for Tunnels
- play_arrow Configuring Class of Service on Services PICs
- CoS on Services PICs Overview
- Configuring CoS Rules on Services PICs
- Configuring CoS Rule Sets on Services PICs
- Example: Configuring CoS Rules on Services PICs
- Packet Rewriting on Services Interfaces
- Multiservices PIC ToS Translation
- Fragmentation by Forwarding Class Overview
- Configuring Fragmentation by Forwarding Class
- Configuring Drop Timeout Interval for Fragmentation by Forwarding Class
- Example: Configuring Fragmentation by Forwarding Class
- Allocating Excess Bandwidth Among Frame Relay DLCIs on Multiservices PICs
- Configuring Rate Limiting and Sharing of Excess Bandwidth on Multiservices PICs
- play_arrow Configuring Class of Service on IQ and Enhanced IQ (IQE) PICs
- CoS on Enhanced IQ PICs Overview
- Calculation of Expected Traffic on IQE PIC Queues
- Configuring the Junos OS to Support Eight Queues on IQ Interfaces for T Series and M320 Routers
- BA Classifiers and ToS Translation Tables
- Configuring ToS Translation Tables
- Configuring Hierarchical Layer 2 Policers on IQE PICs
- Configuring Excess Bandwidth Sharing on IQE PICs
- Configuring Rate-Limiting Policers for High Priority Low-Latency Queues on IQE PICs
- Applying Scheduler Maps and Shaping Rate to Physical Interfaces on IQ PICs
- Applying Scheduler Maps to Chassis-Level Queues
- play_arrow Configuring Class of Service on Ethernet IQ2 and Enhanced IQ2 PICs
- CoS on Enhanced IQ2 PICs Overview
- CoS Features and Limitations on IQ2 and IQ2E PICs (M Series and T Series)
- Differences Between Gigabit Ethernet IQ and Gigabit Ethernet IQ2 PICs
- Shaping Granularity Values for Enhanced Queuing Hardware
- Ethernet IQ2 PIC RTT Delay Buffer Values
- Configuring BA Classifiers for Bridged Ethernet
- Setting the Number of Egress Queues on IQ2 and Enhanced IQ2 PICs
- Configuring the Number of Schedulers per Port for Ethernet IQ2 PICs
- Applying Scheduler Maps to Chassis-Level Queues
- CoS for L2TP Tunnels on Ethernet Interface Overview
- Configuring CoS for L2TP Tunnels on Ethernet Interfaces
- Configuring LNS CoS for Link Redundancy
- Example: Configuring L2TP LNS CoS Support for Link Redundancy
- Configuring Shaping on 10-Gigabit Ethernet IQ2 PICs
- Configuring Per-Unit Scheduling for GRE Tunnels Using IQ2 and IQ2E PICs
- Understanding Burst Size Configuration on IQ2 and IQ2E Interfaces
- Configuring Burst Size for Shapers on IQ2 and IQ2E Interfaces
- Configuring a CIR and a PIR on Ethernet IQ2 Interfaces
- Example: Configuring Shared Resources on Ethernet IQ2 Interfaces
- Configuring and Applying IEEE 802.1ad Classifiers
- Configuring Rate Limits to Protect Lower Queues on IQ2 and Enhanced IQ2 PICs
- Simple Filters Overview
- Configuring a Simple Filter
- play_arrow Configuring Class of Service on 10-Gigabit Ethernet LAN/WAN PICs with SFP+
- CoS on 10-Gigabit Ethernet LAN/WAN PIC with SFP+ Overview
- BA and Fixed Classification on 10-Gigabit Ethernet LAN/WAN PIC with SFP+ Overview
- DSCP Rewrite for the 10-Gigabit Ethernet LAN/WAN PIC with SFP+
- Configuring DSCP Rewrite for the 10-Gigabit Ethernet LAN/WAN PIC
- Queuing on 10-Gigabit Ethernet LAN/WAN PICs Properties
- Mapping Forwarding Classes to CoS Queues on 10-Gigabit Ethernet LAN/WAN PICs
- Scheduling and Shaping on 10-Gigabit Ethernet LAN/WAN PICs Overview
- Example: Configuring Shaping Overhead on 10-Gigabit Ethernet LAN/WAN PICs
- play_arrow Configuring Class of Service on Enhanced Queuing DPCs
- Enhanced Queuing DPC CoS Properties
- Configuring Rate Limits on Enhanced Queuing DPCs
- Configuring WRED on Enhanced Queuing DPCs
- Configuring MDRR on Enhanced Queuing DPCs
- Configuring Excess Bandwidth Sharing
- Configuring Customer VLAN (Level 3) Shaping on Enhanced Queuing DPCs
- Simple Filters Overview
- Configuring Simple Filters on Enhanced Queuing DPCs
- Configuring a Simple Filter
- play_arrow Configuring Class of Service on MICs, MPCs, and MLCs
- CoS Features and Limitations on MIC and MPC Interfaces
- Dedicated Queue Scaling for CoS Configurations on MIC and MPC Interfaces Overview
- Verifying the Number of Dedicated Queues Configured on MIC and MPC Interfaces
- Scaling of Per-VLAN Queuing on Non-Queuing MPCs
- Increasing Available Bandwidth on Rich-Queuing MPCs by Bypassing the Queuing Chip
- Flexible Queuing Mode
- Multifield Classifier for Ingress Queuing on MX Series Routers with MPC
- Example: Configuring a Filter for Use as an Ingress Queuing Filter
- Ingress Queuing Filter with Policing Functionality
- Ingress Rate Limiting on MX Series Routers with MPCs
- Rate Shaping on MIC and MPC Interfaces
- Per-Priority Shaping on MIC and MPC Interfaces Overview
- Example: Configuring Per-Priority Shaping on MIC and MPC Interfaces
- Configuring Static Shaping Parameters to Account for Overhead in Downstream Traffic Rates
- Example: Configuring Static Shaping Parameters to Account for Overhead in Downstream Traffic Rates
- Traffic Burst Management on MIC and MPC Interfaces Overview
- Understanding Hierarchical Scheduling for MIC and MPC Interfaces
- Configuring Ingress Hierarchical CoS on MIC and MPC Interfaces
- Configuring a CoS Scheduling Policy on Logical Tunnel Interfaces
- Per-Unit Scheduling and Hierarchical Scheduling for MPC Interfaces
- Managing Dedicated and Remaining Queues for Static CoS Configurations on MIC and MPC Interfaces
- Excess Bandwidth Distribution on MIC and MPC Interfaces Overview
- Bandwidth Management for Downstream Traffic in Edge Networks Overview
- Scheduler Delay Buffering on MIC and MPC Interfaces
- Managing Excess Bandwidth Distribution on Static Interfaces on MICs and MPCs
- Drop Profiles on MIC and MPC Interfaces
- Intelligent Oversubscription on MIC and MPC Interfaces Overview
- Jitter Reduction in Hierarchical CoS Queues
- Example: Reducing Jitter in Hierarchical CoS Queues
- CoS on Ethernet Pseudowires in Universal Edge Networks Overview
- CoS Scheduling Policy on Logical Tunnel Interfaces Overview
- Configuring CoS on an Ethernet Pseudowire for Multiservice Edge Networks
- CoS for L2TP LNS Inline Services Overview
- Configuring Static CoS for an L2TP LNS Inline Service
- CoS on Circuit Emulation ATM MICs Overview
- Configuring CoS on Circuit Emulation ATM MICs
- Understanding IEEE 802.1p Inheritance push and swap from a Transparent Tag
- Configuring IEEE 802.1p Inheritance push and swap from the Transparent Tag
- CoS on Application Services Modular Line Card Overview
- play_arrow Configuring Class of Service on Aggregated, Channelized, and Gigabit Ethernet Interfaces
- Limitations on CoS for Aggregated Interfaces
- Policer Support for Aggregated Ethernet Interfaces Overview
- Understanding Schedulers on Aggregated Interfaces
- Examples: Configuring CoS on Aggregated Interfaces
- Hierarchical Schedulers on Aggregated Ethernet Interfaces Overview
- Configuring Hierarchical Schedulers on Aggregated Ethernet Interfaces
- Example: Configuring Scheduling Modes on Aggregated Interfaces
- Enabling VLAN Shaping and Scheduling on Aggregated Interfaces
- Class of Service on demux Interfaces
- Example: Configuring Per-Unit Schedulers for Channelized Interfaces
- Applying Layer 2 Policers to Gigabit Ethernet Interfaces
-
- play_arrow Configuration Statements and Operational Commands
list Table of Contents
ON THIS PAGE
Example: Configuring Behavior Aggregate Classifiers
date_range
19-Feb-21
This example shows how to configure behavior aggregate classifiers for a device to determine forwarding treatment of packets.
Requirements
Before you begin, determine the forwarding class and PLP that are assigned by default to each well-known DSCP that you want to configure for the behavior aggregate classifier. See Default Behavior Aggregate Classification.
Overview
You configure behavior aggregate classifiers to classify packets that contain valid DSCPs to appropriate queues. Once configured, you must apply the behavior aggregate classifier to the correct interfaces. You can override the default IP precedence classifier by defining a classifier and applying it to a logical interface. To define new classifiers for all code point types, include the classifiers statement at the [edit class-of-service] hierarchy level.
In this example, you set the DSCP behavior aggregate classifier to ba-classifier as the default DSCP map. You set a best-effort forwarding class as be-class, an expedited forwarding class as ef-class, an assured forwarding class as af-class, and a network control forwarding class as nc-class. Finally, you apply the behavior aggregate classifier to an interface called ge-0/0/0.
Table 1 shows how the behavior aggregate classifier assigns loss priorities, to incoming packets in the four forwarding classes.
ba-classifier Forwarding Class | For CoS Traffic Type | ba-classifier Assignments |
|---|---|---|
| Best-effort traffic | High-priority code point: |
| Expedited forwarding traffic | High-priority code point: |
| Assured forwarding traffic | High-priority code point: |
| Network control traffic | High-priority code point: |
Configuration
Procedure
CLI Quick Configuration
To quickly configure this example, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, copy and paste the commands into the CLI at the [edit] hierarchy level, and then enter commit from the configuration mode.
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set class-of-service classifiers dscp ba-classifier import default set class-of-service classifiers dscp ba-classifier forwarding-class be-class loss-priority high code-points 000001 set class-of-service classifiers dscp ba-classifier forwarding-class ef-class loss-priority high code-points 101111 set class-of-service classifiers dscp ba-classifier forwarding-class af-class loss-priority high code-points 001100 set class-of-service classifiers dscp ba-classifier forwarding-class nc-class loss-priority high code-points 110001 set class-of-service interfaces ge-0/0/0 unit 0 classifiers dscp ba-classifier
Step-by-Step Procedure
The following example requires you to navigate various levels in the configuration hierarchy. For instructions on how to do that, see Using the CLI Editor in Configuration Mode in the CLI User Guide.
To configure behavior aggregate classifiers for a device:
Configure the class of service.
content_copy zoom_out_map[edit] user@host# edit class-of-service
Configure behavior aggregate classifiers for DiffServ CoS.
content_copy zoom_out_map[edit class-of-service] user@host# edit classifiers dscp ba-classifier user@host# set import default
Configure a best-effort forwarding class classifier.
content_copy zoom_out_map[edit class-of-service classifiers dscp ba-classifier] user@host# set forwarding-class be-class loss-priority high code-points 000001
Configure an expedited forwarding class classifier.
content_copy zoom_out_map[edit class-of-service classifiers dscp ba-classifier] user@host# set forwarding-class ef-class loss-priority high code-points 101111
Configure an assured forwarding class classifier.
content_copy zoom_out_map[edit class-of-service classifiers dscp ba-classifier] user@host# set forwarding-class af-class loss-priority high code-points 001100
Configure a network control forwarding class classifier.
content_copy zoom_out_map[edit class-of-service classifiers dscp ba-classifier] user@host# set forwarding-class nc-class loss-priority high code-points 110001
Apply the behavior aggregate classifier to an interface.
content_copy zoom_out_map[edit] user@host# set class-of-service interfaces ge-0/0/0 unit 0 classifiers dscp ba-classifier
Note:You can use interface wildcards for
interface-nameandlogical-unit-number.
Results
From configuration mode, confirm your configuration by entering the show class-of-service command. If the output does not display the intended configuration, repeat the configuration instructions in this example to correct it.
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[edit]
user@host# show class-of-service
classifiers {
dscp ba-classifier {
import default;
forwarding-class be-class {
loss-priority high code-points 000001;
}
forwarding-class ef-class {
loss-priority high code-points 101111;
}
forwarding-class af-class {
loss-priority high code-points 001100;
}
forwarding-class nc-class {
loss-priority high code-points 110001;
}
}
interfaces {
ge-0/0/0 {
unit 0 {
classifiers {
dscp ba-classifier;
}
}
}
If you are done configuring the device, enter commit from configuration mode.
Verification
Confirm that the configuration is working properly.
Verify the DSCP Classifier
Purpose
Make sure that the DSCP classifier is configured as expected.
Action
Run the show class-of-service classifiers name ba-classifier command.
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user@host> show class-of-service classifiers name ba-classifier Classifier: ba-classifier, Code point type: dscp, Index: 10755 Code point Forwarding class Loss priority 000000 best-effort low 000001 be-class high 000010 best-effort low 000011 best-effort low 000100 best-effort low 000101 best-effort low 000110 best-effort low 000111 best-effort low 001000 best-effort low 001001 best-effort low 001010 assured-forwarding low 001011 best-effort low 001100 af-class high 001101 best-effort low 001110 assured-forwarding high 001111 best-effort low 010000 best-effort low 010001 best-effort low 010010 best-effort low 010011 best-effort low 010100 best-effort low 010101 best-effort low 010110 best-effort low 010111 best-effort low 011000 best-effort low 011001 best-effort low 011010 best-effort low 011011 best-effort low 011100 best-effort low 011101 best-effort low 011110 best-effort low 011111 best-effort low 100000 best-effort low 100001 best-effort low 100010 best-effort low 100011 best-effort low 100100 best-effort low 100101 best-effort low 100110 best-effort low 100111 best-effort low 101000 best-effort low 101001 best-effort low 101010 best-effort low 101011 best-effort low 101100 best-effort low 101101 best-effort low 101110 expedited-forwarding low 101111 ef-class high 110000 network-control low 110001 nc-class high 110010 best-effort low 110011 best-effort low 110100 best-effort low 110101 best-effort low 110110 best-effort low 110111 best-effort low 111000 network-control low 111001 best-effort low 111010 best-effort low 111011 best-effort low 111100 best-effort low 111101 best-effort low 111110 best-effort low 111111 best-effort low
Meaning
Notice that the default classifier is incorporated into the customer classifier. If you were to remove the import default statement from the custom classifier, the custom classifier would look like this:
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user@host> show class-of-service classifier name ba-classifier Classifier: ba-classifier, Code point type: dscp, Index: 10755 Code point Forwarding class Loss priority 000001 be-class high 001100 af-class high 101111 ef-class high 110001 nc-class high
Verifying That the Classifier Is Applied to the Interfaces
Purpose
Make sure that the classifier is applied to the correct interfaces.
Action
Run the show class-of-service interface command.
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user@host> show class-of-service interface ge-0/0/0 Physical interface: ge-0/0/0, Index: 144 Queues supported: 8, Queues in use: 4 Scheduler map: <default>, Index: 2 Congestion-notification: Disabled Logical interface: ge-0/0/0.0, Index: 333 Object Name Type Index Classifier ba-classifier dscp 10755
Meaning
The interface is configured as expected.
