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Understanding and Troubleshooting Cisco Catalyst 9800 Series Wireless Controllers

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Understanding and Troubleshooting Cisco Catalyst 9800 Series Wireless Controllers

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  • For any student, regardless of previous Cisco-specific knowledge
  • Covers everything from Day 0 deployments to advanced troubleshooting
  • Shows how to configure controller interfaces, build WLANs, use AP groups and RF deployment guidelines, leverage DNA Spaces and DNA Center, and more
  • Guides students step-by-step through applying advanced 9800-specific functions
  • Includes thorough coverage of programmability and telemetry: topics new to many students


  • Copyright 2022
  • Dimensions: 7-3/8" x 9-1/8"
  • Pages: 656
  • Edition: 1st
  • Book
  • ISBN-10: 0-13-749232-4
  • ISBN-13: 978-0-13-749232-9

The definitive professional’s guide to the Cisco next-gen 9800 wireless controllers

As wireless networks, applications, and services rapidly evolve, they grow increasingly business critical, with steeper requirements for performance, latency, deployment density, and device support. The advanced Catalyst 9800 wireless controllers from Cisco meet these challenges, delivering exceptional adaptability, security, performance, scalability, and programmability. Based on the modern and secure Cisco IOS XE operating system, their support for Cisco intent-based networking will help you continually leverage new innovation. Now, four Cisco experts offer end-to-end guidance, practical tips, and proven recommendations for designing, deploying, and managing wireless networks with the Catalyst 9800.

For technical decision makers, this guide delivers a deep understanding of Catalyst 9800 hardware and software, tightly linked to business value. Architects will find essential details for both upfront network design and feature implementation. Network operators and other IT professionals will discover tested tools and methods for reliable and efficient setup, configuration, monitoring, and troubleshooting. Whatever your role, this guide will help you maximize the value of any Catalyst 9800 network, and serve as your indispensable reference for years to come.

  • Understand Catalyst 9800 benefits, capabilities, roles, and architecture
  • Learn the new C9800 Configuration Model, with key design considerations and best practices
  • Deploy and configure the C9800 in private and public clouds
  • Systematically secure the C9800: from AAA and ACLs to rogue detection and wireless intrusion prevention (WIPS)
  • Establish and optimize seamless client roaming in enterprise environments
  • Learn how the C9800 implements key RF concepts
  • Plan and implement an end-to-end architecture for QoS, and design/ deploy for high availability and network services like multicast
  • Discover value-added wireless services available through Cisco DNA Spaces
  • Drive agility and value via network programmability with YANG, Python, RESTCONF, and NETCONF
  • Make the most out of the rich data models of Model-Driven Telemetry and Programmability using open-source tools
  • Walk through wireless network troubleshooting, backup/restore, and upgrades

Sample Content

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Table of Contents

Introduction xxvii

Chapter 1 Cisco C9800 Series 1

Why Cisco C9800? 2

The Role of the Wireless Controller in a Cloud Era 7

Managing the Cisco C9800 10

Cisco Next-Generation Wireless Stack 22

Summary 23

References 23

Chapter 2 Hardware and Software Architecture of the C9800 25

General CAPWAP Split MAC Architecture 25

The Controller Control Plane Architecture Elasticity 27

Wireless Client State Machine 31

One Dataplane to Rule Them All (or Three at the Maximum) 35

Hardware Overview 38

Summary 42

Chapter 3 C9800 Configuration Model 43

C9800 New Configuration Model 43

Cisco C9800 Series Profile and Tag Considerations 48

Summary 64

References 64

Chapter 4 C9800 Deployment and Installation 65

C9800 Deployment Models 65

Setting Up Your First Catalyst Wireless Network 79

Summary 87

References 87

Chapter 5 Security 89

Network Security Fundamentals 89

Wireless Security Fundamentals 116

Securing the Air 128

Securing Your Access Points 148

Securing Your Wireless Controller 151

Encrypted Traffic Analytics 154

Cisco Umbrella 155

Cisco Secure Development Lifecycle (CSDL) 157

Summary 157

References 157

Chapter 6 Mobility and Client Roaming 159

802.11 Roaming 160

Types of Client Roaming 181

C9800 to AireOS Inter-Release Controller Mobility (IRCM) 191

Summary 192

References 193

Chapter 7 RF Deployment and Guidelines 195

Radio Resources Management (RRM) Concepts and Components 195

Challenging RF Environments 199

Radio Resources Management (RRM) 203

DCA 211

RF Profiles 215

Spectrum Intelligence and CleanAir 219

Advanced RF Features 224

Airtime Fairness (ATF) 228

Dynamic Frequency Selection (DFS) 232

Flexible Radio Assignment (FRA) 235

Wireless Intrusion Prevention System (WIPS) and Rogue Detection 238

Summary 246

References 246

Chapter 8 Multicast and Multicast Domain Name System (mDNS) 247

Wireless Multicast 250

Media Stream Feature 263

mDNS 272

Summary 283

References 283

Chapter 9 Quality of Service (QoS) 285

Wi-Fi Quality of Service (QoS) 286

Wi-Fi (802.11) QoS Fundamentals 287

Implementing Wireless QoS on the C9800 300

Designing and Deploying Catalyst C9800 QoS 304

Best Practices 320

Summary 322

References 322

Chapter 10 C9800 High Availability 323

SSO Redundancy 324

HA Teardown 349

SSO Deployment: Impact on Features 350

N+1 Redundancy 352

N+1 vs. SSO High Availability 357

HA in EWC-AP Deployment 358

HA in EWC-SW Deployment 359

Summary 359

References 360

Chapter 11 Cisco DNA Spaces Integration and IoT 361

Value-Added Wireless Services 361

Connected Mobile Experiences (CMX) 372

Cisco DNA Spaces 372

Specific Service Examples 379

Summary 392

References 392

Chapter 12 Network Programmability 393

What Is Network Programmability? 393

Why Is Network Programmability Needed? 393

Is Network Programmability a New Concept? 396

Orchestration of the Entire Network 396

Configuration Repeatability 396

Idempotency 397

Imperative vs. Declarative Models 397

Infrastructure as Code (IaC) 400

Network Programmability in the C9800 401

Data Models 402

YANG Data Models 403

Encoding Formats 406

Protocols 408

Tools to Examine YANG Models 412

How to Examine Data Using NETCONF and YANG Suite 419

How to Examine Data Using RESTCONF and POSTMAN 421

Python and Network Programmability 429

Summary 436

References 436

Chapter 13 Model-Driven Telemetry 437

What Is Model-Driven Telemetry? 437

How to Enable Model-Driven Telemetry 438

Operational Data and KPIs 441

Polling vs. Subscribing 447

Telemetry Streams 448

How to Identify Subtrees in YANG Models 449

Dial-out vs. Dial-in 450

Tools 460

Summary 467

References 467

Chapter 14 Cisco DNA Center/Assurance Integration 469

Introduction 469

Managing the C9800 with Cisco DNA Center 472

Summary 492

References 492

Chapter 15 Backing Up, Restoring, and Upgrading Your C9800 493

Saving and Restoring the Configuration for Disaster Recovery 493

Running IOS-XE in Install or Bundle Mode 500

Upgrading (and Downgrading) the Controller Safely 501

Summary 506

References 506

Chapter 16 Troubleshooting 507

Control Plane Tracing 509

Embedded Packet Capture (EPC) 525

Packet Tracer 531

Troubleshooting Dashboard 536

Other On-the-Box Tools on the C9800 GUI 540

Offline Tools for the C9800 545

Health and KPI Monitoring 548

Summary 577

References 578

Appendix A Setting Up a Development Environment 579

9780137492329, TOC, 5/27/2022



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