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QOS v2.5 - Implementing Cisco Quality of Service


Implementing Cisco Quality of Service (QOS) v2.5 provides learners with in-depth knowledge of QoS requirements, conceptual models such as best effort, IntServ, and DiffServ, and the implementation of QoS on Cisco platforms. The curriculum covers the theory of QoS, design issues, and configuration of various QoS mechanisms to facilitate the creation of effective administrative policies providing QoS.

Case studies and lab exercises included in the course help learners to apply the concepts from the individual modules to real-life scenarios. The course also gives learners design and usage rule for advanced QoS features. This gives the learners the opportunity to design and implement efficient, optimal, and trouble-free multiservice networks.


Upon completing this course, the learner will be able to meet these overall objectives:

  • You will be able to identify, describe, and correctly implement the appropriate QoS mechanisms required to create an effective administrative policy providing QoS


The knowledge and skills that a learner must have before attending this course are as follows:

  • Interconnecting Cisco Networking Devices, Part 1 and 2 (ICND1 and ICND2)
  • Cisco Certified Networking Associate

Who Should Attend

The primary audience for this course is as follows:

  • Pre- and post-sales technical engineers responsible for designing, implementing, or troubleshooting networks
  • Network architects responsible for designing multiservice networks to carry voice, video, and data traffic in enterprise or service provider environments
  • Advanced Unified Communications Specialization
  • Master UC Specialization
  • Master Telepresence ATP

The secondary audience for this course is as follows:

  • CCIE R&S Candidates


Module 1: Introduction to QoS

      Lesson 1: Review Converged Networks
      • Converged Networks
      • Quality Issues in Converged Networks
      • Available Bandwidth
      • Components of Network Delay
      • Calculating End-to-End Delay
      • Jitter
      • Packet Loss
      • Summary


      Lesson 2: Understand QoS
      • QoS Defined
      • QoS Policy Defined
      • Implement a QoS Policy
      • Identify Network Traffic
      • Voice Traffic Profile
      • Videoconferencing Traffic Profile
      • Cisco TelePresence Traffic Profile
      • Data Traffic Profile
      • Divide Network Traffic into Classes
      • Define Policies for Traffic Classes
      • QoS Mechanisms
      • QoS Implementation Methods
      • QoS Monitoring Methods
      • Cisco Medianet QoS Design
      • Summary
      Case Study 1-1: QoS Mechanisms
        Task 1: Apply QoS Mechanisms
      Lesson 3: Describe Best-Effort and Integrated Services Models
      • QoS Models
      • Best-Effort QoS Model
      • IntServ Model
      • Resource Reservation Protocol
      • RSVP Components
      • RSVP Interface Bandwidth Queuing
      • Summary
      Lesson 4: Describe the Differentiated Services Model
      • DiffServ Model
      • DiffServ Terminology
      • DSCP Encoding
      • Per-Hop Behaviors
      • Expedited Forwarding
      • Assured Forwarding
      • AF Drop Probability
      • Class Selector
      • Integration of IntServ and DiffServ
      • Summary
      Lesson 5: Module Summary
      • References
    Lesson 6: Module Self-Check

Module 2: Implement and Monitor QoS

      Lesson 1: MQC Introduction
      • Modular QoS CLI
      • MQC Components
      • Example: MQC Policy Configuration
      • Class Maps Overview
      • Match Operation in Class Maps
      • Policy Maps Overview
      • Service Policy Overview
      • Hierarchical Policy
      • Summary
      Lesson 2: Monitor QoS
      • SNMP Management of QoS
      • Describe Class-Based QoS MIB
      • Cisco NBAR
      • Cisco NBAR Protocol Discovery
      • Cisco NBAR Protocol Discovery MIB
      • NetFlow
      • Cisco Flexible NetFlow
      • Cisco Flexible NetFlow Integration with NBAR
      • Class-Based Flexible NetFlow
      • Cisco Performance Monitor
      • Cisco Mediatrace
      • Cisco IP SLA
      • IP SLA: UDP Jitter
      • Summary
      Lab 2-1: IP SLA Setup and QoS Baseline Measurement
        Task 1: Verify Network Connectivity
        Task 2: Create a Baseline Measurement of Network Traffic
        Task 3: Measure the Network Performance Under Traffic Load
        Task 4: QoS Measurement Lab Results


      Lesson 3: Define Campus AutoQoS
      • AutoQoS
      • AutoQoS Macros
      • Trust Boundaries
      • Campus AutoQoS Trust
      • Campus AutoQoS Conditional Trust
      • Campus AutoQoS Video
      • Campus AutoQoS VoIP
      • Campus AutoQoS Classify
      • Monitoring AutoQoS in the Campus
      • Summary
      Lesson 4: Define WAN AutoQoS
      • Cisco AutoQoS for Routers
      • WAN AutoQoS VoIP
      • AutoQoS for the Enterprise Overview
      • Configuring AutoQoS for the Enterprise
      • Monitoring AutoQoS in the WAN
      • Summary
      Lab 2-2: Configuring QoS with Cisco AutoQoS
        Task 1: Configure Cisco AutoQoS Classify on the Catalyst 2960-S Switch
        Task 2: Configure Cisco AutoQoS for the Enterprise on Cisco IOS Routers
        Task 3: Measure Network Performance with Cisco AutoQoS for the Enterprise
        Task 4: QoS Measurement Results
      Lesson 5: Module Summary
      • References
    Lesson 6: Module Self-Check

Module 3: Classification and Marking

      Lesson 1: Classification and Marking Overview
      • Classification
      • Marking
      • Classification and Marking at the Data Link Layer
      • Classification and Marking at the Network Layer
      • Mapping QoS Marking Between OSI Layers
      • QoS Service Class Defined
      • Service Class Templates
      • RFC 4594 Marking Recommendations
      • Summary
      Case Study 3-1: Classification and Marking
        Task 1: Classification and Marking
        Task 2: Identify Network Locations Where Classification and Marking Should Be Applied
      Lesson 2: MQC for Classification and Marking
      • MQC Classification Options
      • Configuring Class Maps
      • Monitoring Classification
      • MQC Marking Options
      • Configuring Class-Based Marking
      • Monitoring Class-Based Marking
      • Configuring IPV6 Classification and Marking
      • Summary
      Lab 3-2: Classification and Marking Using MQC
        Task 1: Configure an IP Extended Access List
        Task 2: Configure MQC Classification
        Task 3: Configure Class-Based Marking
      Lesson 3: NBAR for Classification
      • Cisco NBAR
      • NBAR Application Support
      • Configuring NBAR With MQC
      • Classifying HTTP Traffic
      • NBAR2 Application Grouping
      • NBAR Port Map
      • NBAR Custom Protocols
      • Configuring Custom Protocols
      • NBAR Worm Policing
      • NBAR versus Future Worms
      • Summary


      Lab 3-3: Using NBAR for Classification
        Task 1: Upgrade the NBAR Protocol Pack
        Task 2: Discover Applications and Traffic by Using NBAR
        Task 3: Configure Classification with NBAR
      Lesson 4: Use of QoS Preclassify
      • Issues with QoS on VPNs
      • ToS Byte Preservation
      • QoS Preclassify Operation
      • Configuring QoS Preclassify
      • Monitoring QoS Preclassify
      • Summary
      Lab 3-4: Configuring QoS Preclassify
        Task 1: Configure a GRE Tunnel
        Task 2: Configure QoS Preclassify
      Lesson 5: Campus Classification and Marking
      • Campus Classification and Marking
      • Overview of QoS Trust Boundaries
      • Campus Ingress QoS Models
      • QoS Map Tables: Marking
      • Internal DSCP
      • Applying Campus Switch Classification and Marking
      • Monitoring Campus Classification and Marking
      • Summary
      Lab 3-5: Campus Classification and Marking Using MQC
        Task 1: Configure a Trust Boundary
        Task 2: Configure CoS-to-DSCP Mapping
        Task 3: Configure Class-Based Marking
        Task 4: Verify QoS Markings
        Task 5: Adjust Router Classification and Marking Policy
      Lesson 6: Module Summary
      • References
    Lesson 7: Module Self-Check

Module 4: Congestion Management

      Lesson 1: Queuing Introduction
      • Congestion and Queuing
      • Queuing Components
      • Hardware Queue Size
      • Congestion on Logical Interfaces
      • Queuing Algorithms
      • FIFO Queuing
      • Priority Queuing
      • Round-Robin Queuing
      • WRR Queuing
      • DRR Queuing
      • Summary
      Lesson 2: Configure WFQ
      • Weighted Fair Queuing
      • WFQ Classification
      • WFQ Scheduling
      • WFQ Drop Operation
      • Benefits and Drawbacks of WFQ
      • Configuring WFQ
      • Monitoring WFQ
      • Summary
      Lab 4-1: Configuring Fair Queuing
        Task 1: Configure Fair Queuing
        Task 2: Measure Network Performance with Fair Queuing
        Task 3: Adjust the Fair Queuing Configuration
        Task 4: Measure Network Performance with Fair Queuing Configured with 256 Dynamic Queues
        Task 5: QoS Measurement Lab Results
      Lesson 3: Configure CBWFQ and LLQ
      • Class-Based Weighted Fair Queuing
      • CBWFQ Architecture
      • Benefits and Drawbacks of CBWFQ
      • Configuring CBWFQ
      • Low Latency Queuing
      • LLQ Architecture
      • Configuring LLQ
      • Monitoring LLQ-CBWFQ
      • Summary
      Lab 4-2: Configuring LLQ-CBWFQ
        Task 1: Configure a CBWFQ Policy with LLQ
        Task 2: Apply and Monitor CBWFQ with LLQ Operation
        Task 3: Measure Network Performance with CBWFQ
        Task 4: QoS Measurement Lab Results
      Lesson 4: Configure Campus Congestion Management
      • Campus Queuing
      • Catalyst Switch Hardware Queue Nomenclature
      • Queue Mapping
      • WRR on Campus Switches
      • WRR Bandwidth and Buffer Settings
      • SRR on Campus Switches
      • SRR Common and Reserved Buffers
      • Configuring Ingress Queuing on Cisco Catalyst 3750 Series Switches
      • Configuring Egress Queuing on Cisco Catalyst 3750 Series Switches
      • Monitoring Congestion Management On Cisco Catalyst 3750 Series Switches
      • Summary
      Lab 4-3: Configuring Campus-Based Queuing Mechanisms
        Task 1: Review Egress Queuing Defaults
        Task 2: Configure Global Egress Queuing Parameters
        Task 3: Configure and Monitor Egress Queuing
      Lesson 5: Module Summary
      • References
    Lesson 6: Module Self-Check

Module 5: Congestion Avoidance

      Lesson 1: Congestion Avoidance Introduction
      • TCP Behavior
      • Congestion and TCP
      • Example: TCP Congestion Control Algorithms
      • Managing Congestion with Tail Drop
      • Impact of Tail Drop
      • Random Early Detection
      • RED Profiles and Modes
      • TCP Behavior Before and After RED
      • Summary
      Lesson 2: Configure Class-Based WRED
      • Weighted Random Early Detection
      • Class-Based WRED
      • WRED Building Blocks
      • WRED Profiles
      • IP Precedence-Based WRED
      • DSCP-Based WRED
      • Configure CBWRED
      • Changing WRED Sensitivity to Bursts
      • Example: DSCP-Based WRED
      • Monitoring CBWRED
      • Summary
      Case Study 5-1: WRED Traffic Profiles
        Task 1: Create WRED Traffic Profiles
      Lesson 3: Configure ECN
      • Explicit Congestion Notification
      • ECN Field
      • ECN and WRED
      • ECN Operation
      • Configuring ECN
      • Monitoring ECN
      • Summary
      Lab 5-2: Configuring DSCP-Based WRED
        Task 1: Configure DSCP-Based WRED
        Task 2: Monitor DSCP-Based WRED
        Task 3: Configure DSCP-Based CBWRED with ECN
        Task 4: Monitor DSCP-Based WRED with ECN
      Lesson 4: Describe Campus-Based Congestion Avoidance
      • Congestion Avoidance in the Campus
      • Weighted Tail Drop
      • Configuring WTD Thresholds on the Cisco Catalyst 3750 Series Switch
      • WRED on Campus Switches
      • Dynamic Buffer Limiting
      • Summary
      Lab 5-3: Configuring WTD Thresholds
        Task 1: Configure and Monitor Weighted Tail Drop
      Lesson 5: Module Summary
      • References
    Lesson 6: Module Self-Check

Module 6: Traffic Policing and Shaping

      Lesson 1: Traffic Policing and Shaping Overview
      • Traffic Policing and Traffic Shaping
      • Policing and Shaping Use Cases
      • Policing vs. Shaping
      • Single Token Bucket Model
      • Single Token Bucket Class-Based Policing
      • Dual Token Bucket Class-Based Policing
      • Dual-Rate Token Bucket Class-Based Policing
      • Class-Based Traffic Shaping
      • Summary
      Lesson 2: Configure Class-Based Policing
      • Class-Based Policing
      • Configuring Class-Based Policing
      • Example: Single-Rate Single Token Policer
      • Example: Single-Rate Dual Token Policer
      • Example: Dual-Rate Policer
      • Monitoring Class-Based Policing
      • Summary
      Lesson 3: Campus Policing
      • Campus Policing Overview
      • QoS Map Tables: Policing
      • Applying Campus Switch Policing
      • Campus Aggregate Policing
      • Campus Microflow Policing
      • Summary
      Lab 6-1: Configuring Class-Based Policing
        Task 1: Configure Single Token Bucket Class-Based Policing
        Task 2: Monitor Single Token Bucket Class-Based Policing
        Task 3: Configure Dual Token Bucket Class-Based Policing
        Task 4: Monitor Dual Token Bucket Class-Based Policing
      Lesson 4: Configure Class-Based Shaping
      • Class-Based Shaping
      • Shaping Methods
      • Configuring Class-Based Shaping
      • Example: Shaping Configuration
      • Example: Hierarchical Shaping
      • Monitoring Class-Based Shaping
      • Summary
      Lab 6-2: Configuring Class-Based Shaping
        Task 1: Migrate Traffic to the MPLS Service
        Task 2: Configure Class-Based Shaping
        Task 3: Configure Hierarchical Shaping
      Lesson 5: Configure Class-Based Shaping on Frame Relay Interfaces
      • Frame Relay Refresher
      • Frame Relay Congestion Control
      • Frame Relay Congestion Adaptation
      • FECN-to-BECN Propagation
      • Configuring Adaptive Class-Based Shaping
      • Monitoring FRTS
      • Summary
      Lesson 6: Configure Frame Relay Voice-Adaptive Traffic Shaping and Fragmentation
      • Frame Relay Voice-Adaptive Traffic Shaping and Fragmentation
      • Benefits of Frame Relay Voice-Adaptive Traffic Shaping and Fragmentation
      • Frame Relay Voice-Adaptive Traffic Shaping and Fragmentation Operation
      • Configuring Frame Relay Voice-Adaptive Traffic Shaping and Fragmentation
      • Monitoring Frame Relay Voice-Adaptive Traffic Shaping and Fragmentation
      • Summary
      Lesson 7: Module Summary
    Lesson 8: Module Self-Check

Module 7: Link Efficiency Mechanisms

      Lesson 1: Link Efficiency Mechanisms Overview
      • Link Efficiency Mechanisms
      • Layer 2 Payload Compression
      • Header Compression
      • Large Packet "Freeze Out"
      • Serialization Delay
      • Link Fragmentation and Interleaving
      • Fragment Size Recommendations for Voice
      • Summary
      Lesson 2: Configure Class-Based Header Compression
      • Header Compression
      • Class-Based TCP Header Compression
      • Example: Class-Based TCP Header Compression Configuration
      • Class-Based RTP Header Compression
      • Example: Class-Based RTP Header Compression
      • Configuring Class-Based Header Compression
      • Monitoring Class-Based Header Compression
      • Summary
      Lab 7-1: Configuring Class-Based Header Compression
        Task 1: Configure Class-Based Header Compression
        Task 2: Monitor Class-Based Header Compression
      Lesson 3: Configure LFI
      • LFI Options
      • Configuring MLP with Interleaving
      • Monitoring MLP Interleaving
      • FRF.12 Frame Relay Fragmentation
      • Configuring FRF.12 Frame Relay Fragmentation
      • Monitoring FRF.12 Frame Relay Fragmentation
      • Summary
      Lab 7-2: Configuring LFI
        Task 1: Configure LFI
        Task 2: Monitor LFI
      Lesson 4: Module Summary
      • References
    Lesson 5: Module Self-Check

Module 8: Deploying End-to-End QoS

      Lesson 1: Apply Best Practices for QoS Policy Design
      • Optimally Deploying QoS Within the Enterprise
      • Strategically Defining QoS Objectives
      • Cisco Modified RFC 4594 Marking Recommendations and Class Expansion
      • Understanding Application Service-Level Requirements
      • QoS Requirements for Control Plane Traffic
      • Control Plane Policing
      • Data Plane Policing
      • Classification and Marking Best Practices
      • Policing and Markdown Best Practices
      • Queuing and Dropping Best Practices
      • Link Efficiency Mechanisms Best Practices
      • Summary
      Lesson 2: End-to-End QoS Deployments
      • Deploying End-to-End QoS
      • Enterprise Campus QoS Guidelines
      • Campus QoS Deployment Steps and Options
      • Branch Router QoS Guidelines
      • WAN Edge QoS Design Considerations
      • Enterprise Network with Layer 2 Service
      • Enterprise Network with Layer 3 Service
      • QoS Service Level Agreements
      • QoS Implications of Layer 3 Service Offerings
      • Enterprise-to-Service Provider QoS Class Mapping
      • Re-Marking DSCP at SP MPLS Edge
      • Summary
      Lab 8-1: Mapping Enterprise QoS Policy to the Service Provider Policy
        Task 1: Adjust QoS Markings to Match the Service Provider QoS Policy
        Task 2: Re-mark Inbound Traffic from the Service Provider
      Lesson 3: Module Summary
      • References
      Lesson 4: Module Self-Check