Cisco Software-Defined Access

; Srilatha Vemula ; Jason Gooley

The definitive Cisco SD-Access resource, from the architects who train Cisco’s own engineers and partners

This comprehensive book guides you through all aspects of planning, implementing, and operating Cisco Software-Defined Access (SD-Access). Les mer
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The definitive Cisco SD-Access resource, from the architects who train Cisco’s own engineers and partners

This comprehensive book guides you through all aspects of planning, implementing, and operating Cisco Software-Defined Access (SD-Access). Through practical use cases, you’ll learn how to use intent-based networking, Cisco ISE, and Cisco DNA Center to improve any campus network’s security and simplify its management.

Drawing on their unsurpassed experience architecting solutions and training technical professionals inside and outside Cisco, the authors explain when and where to leverage Cisco SD-Access instead of a traditional legacy design. They illuminate the fundamental building blocks of a modern campus fabric architecture, show how to design a software-defined campus that delivers the most value in your environment, and introduce best practices for administration, support, and troubleshooting.

Case studies show how to use Cisco SD-Access to address secure segmentation, plug and play, software image management (SWIM), host mobility, and more. The authors also present full chapters on advanced Cisco SD-Access and Cisco DNA Center topics, plus detailed coverage of Cisco DNA monitoring and analytics.

Learn how Cisco SD-Access addresses key drivers for network change, including automation and security
Explore how Cisco DNA Center improves network planning, deployment, evolution, and agility
Master Cisco SD-Access essentials: design, components, best practices, and fabric construction
Integrate Cisco DNA Center and Cisco ISE, and smoothly onboard diverse endpoints
Efficiently operate Cisco SD-Access and troubleshoot common fabric problems, step by step
Master advanced topics, including multicast flows, Layer 2 flooding, and the integration of IoT devices
Extend campus network policies to WANs and data center networks
Choose the right deployment options for Cisco DNA Center in your environment
Master Cisco DNA Assurance analytics and tests for optimizing the health of clients, network devices, and applications



Introduction xvii
Chapter 1 Today’s Networks and the Drivers for Change 1
Networks of Today 1
Common Business and IT Trends 4
Common Desired Benefits 5
High-Level Design Considerations 6
Cisco Digital Network Architecture 10
Past Solutions to Today’s Problems 12
    Spanning-Tree and Layer 2–Based Networks 13
Introduction to Multidomain 16
    Cloud Trends and Adoption 18
Summary 20
Chapter 2 Introduction to Cisco Software-Defined Access 21
Challenges with Today’s Networks 22
Software-Defined Networking 22
Cisco Software-Defined Access 23
    Cisco Campus Fabric Architecture 24
    Campus Fabric Fundamentals 25
    Cisco SD-Access Roles 27
Network Access Control 30
    Why Network Access Control? 31
Introduction to Cisco Identity Services Engine 32
    Overview of Cisco Identity Services Engine 32
    Cisco ISE Features 34
        Secure Access 34
        Device Administration 37
        Guest Access 38
        Profiling 40
        Bring Your Own Device 45
        Compliance 46
        Integrations with pxGrid 48
    Cisco ISE Design Considerations 50
    Cisco ISE Architecture 50
    Cisco ISE Deployment Options 51
        Standalone Deployment 51
        Distributed Deployment 51
        Dedicated Distributed Deployment 52
Segmentation with Cisco TrustSec 54
    Cisco TrustSec Functions 54
        Classification 55
        Propagation 55
        Enforcement 57
Summary 58
Chapter 3 Introduction to Cisco DNA Center 59
Network Planning and Deployment Trends 59
History of Automation Tools 60
Cisco DNA Center Overview 62
Design and Visualization of the Network 64
    Site Design and Layout 64
    Network Settings 69
    Wireless Deployments 70
Network Discovery and Inventory 72
    Discovery Tool 72
    Inventory 74
Device Configuration and Provisioning 77
Summary 79
Chapter 4 Cisco Software-Defined Access Fundamentals 81
Network Topologies 81
Cisco Software-Defined Access Underlay 82
    Manual Underlay 83
    Automated Underlay: LAN Automation 84
Wireless LAN Controllers and Access Points in Cisco Software-Defined Access 89
Shared Services 90
Transit Networks 91
    IP-Based Transit 91
    SD-Access Transit 92
Fabric Creation 92
    Fabric Location 93
    Fabric VNs 94
Fabric Device Roles 94
    Control Plane 95
    Fabric Borders 96
    Border Automation 98
    Border and Control Plane Collocation 99
    Fabric Edge Nodes 100
    Intermediate Nodes 103
    External Connectivity 104
        Fusion Router 104
Host Onboarding 105
    Authentication Templates 105
    VN to IP Pool Mapping 106
    SSID to IP Pool Mapping 108
    Switchport Override 109
Summary 110
References in This Chapter 110
Chapter 5 Cisco Identity Services Engine with Cisco DNA Center 111
Policy Management in Cisco DNA Center with Cisco ISE 112
    Integration of Cisco DNA Center and ISE 113
        Certificates in Cisco DNA Center 113
        Certificates on Cisco Identity Services Engine 115
        Cisco ISE and Cisco DNA Center Integration Process 116
Group-Based Access Control 122
Segmentation with Third-Party RADIUS Server 126
Secure Host Onboarding in Enterprise Networks 128
    Endpoint Host Modes in 802.1X 128
        Single-Host Mode 128
        Multi-Host Mode 128
        Multi-Domain Mode 129
        Multi-Auth Mode 129
802.1X Phased Deployment 130
    Why a Phased Approach? 131
        Phase I: Monitor Mode (Visibility Mode) 132
        Phase II: Low-Impact Mode 133
        Phase II: Closed Mode 134
Host Onboarding with Cisco DNA Center 136
    No Authentication Template 137
    Open Authentication Template 138
    Closed Authentication 140
    Easy Connect 141
Security in Cisco Software-Defined Access Network 144
    Macro-Segmentation in Cisco SD-Access 144
    Micro-Segmentation in Cisco SD-Access 145
Policy Set Overview in Cisco ISE 146
Segmentation Policy Construction in Cisco SD-Access 148
    Corporate Network Access Use Case 149
    Guest Access Use Case 159
Segmentation Outside the Fabric 164
Summary 164
References in This Chapter 165
Chapter 6 Cisco Software-Defined Access Operation and Troubleshooting 167
Cisco SD-Access Under the Covers 167
    Fabric Encapsulation 167
        LISP 168
        VXLAN 171
        MTU Considerations 172
Host Operation and Packet Flow in Cisco SD-Access 172
    DHCP in Cisco SD-Access 172
    Wired Host Onboarding and Registration 175
    Wired Host Operation 176
        Intra-Subnet Traffic in the Fabric 176
        Inter-Subnet Traffic in the Fabric 179
        Traffic to Destinations Outside of the Fabric 180
    Wireless Host Operation 180
        Initial Onboarding and Registration 180
Cisco SD-Access Troubleshooting 181
    Fabric Edge 182
    Fabric Control Plane 186
Authentication/Policy Troubleshooting 188
    Authentication 188
    Policy 190
    Scalable Group Tags 191
Summary 193
References in This Chapter 193
Chapter 7 Advanced Cisco Software-Defined Access Topics 195
Cisco Software-Defined Access Extension to IoT 196
    Types of Extended Nodes 198
        Extended Nodes 198
        Policy Extended Nodes 198
    Configuration of Extended Nodes 200
    Onboarding the Extended Node 203
    Packet Walk of Extended Cisco SD-Access Use Cases 205
        Use Case: Hosts in Fabric Communicating with Hosts Connected Outside the Fabric 205
        Use Case: Traffic from a Client Connected to a Policy Extended Node 206
        Use Case: Traffic to a Client Connected to a Policy Extended Node 207
        Use Case: Traffic Flow Within a Policy Extended Node 207
Multicast in Cisco SD-Access 208
    Multicast Overview 209
    IP Multicast Delivery Modes 210
Multicast Flows in Cisco SD-Access 210
    Scenario 1: Multicast in PIM ASM with Head-End Replication (Fabric RP) 211
    Scenario 2: Multicast in PIM SSM with Head-End Replication 213
    Scenario 3: Cisco SD-Access Fabric Native Multicast 214
    Cisco SD-Access Multicast Configuration in Cisco DNA Center 216
Layer 2 Flooding in Cisco SD-Access 218
    Layer 2 Flooding Operation 219
Layer 2 Border in Cisco SD-Access 221
    Layer 2 Intersite 224
    Layer 2 Intersite Design and Traffic Flow 224
    Fabric in a Box in Cisco SD-Access 227
Cisco SD-Access for Distributed Campus Deployments 228
    Types of Transit 229
        IP Transit 229
        Fabric Multisite or Multidomain with IP Transit 230
        Cisco SD-Access Transit 232
        Cisco SD-WAN Transit 237
    Policy Deployment Models in Cisco SD-Access Distributed Deployment 238
Cisco SD-Access Design Considerations 240
    Latency Considerations 240
    Cisco SD-Access Design Approach 241
        Very Small Site 241
        Small Site 242
        Medium Site 243
        Large Site 243
        Single-Site Design Versus Multisite Design 244
        Cisco SD-Access Component Considerations 245
        Underlay Network 246
        Underlay Network Design Considerations 246
        Overlay Network 247
        Overlay Fabric Design Considerations 247
        Fabric Control Plane Node Design Considerations 248
        Fabric Border Node Design Considerations 248
        Infrastructure Services Design Considerations 249
        Fabric Wireless Integration Design Considerations 249
        Wireless Over-the-Top Centralized Wireless Option Design Considerations 250
        Mixed SD-Access Wireless and Centralized Wireless Option Design Considerations 250
        Wireless Guest Deployment Considerations 250
        Security Policy Design Considerations 251
Cisco SD-Access Policy Extension to Cisco ACI 252
Summary 254
References in This Chapter 254
Chapter 8 Advanced Cisco DNA Center 255
Cisco DNA Center Architecture and Connectivity 256
    Hardware and Scale 256
    Network Connectivity 256
    High Availability and Clustering with Cisco DNA Center 258
Software Image Management 259
    Image Repository 261
    Golden Image 262
    Upgrading Devices 263
Cisco DNA Center Templates 266
    Template Creation 267
    Template Assignment and Network Profiles 269
    Deploying Templates 270
Plug and Play 272
    Onboarding Templates 273
    PnP Agent 275
    Claiming a Device 276
Cisco DNA Center Tools 280
    Topology 280
    Command Runner 281
    Security Advisories 283
Summary 284
References in This Chapter 284
Chapter 9 Cisco DNA Assurance 285
Assurance Benefits 285
    Challenges of Traditional Implementations 285
    Cisco DNA Analytics 286
Cisco DNA Assurance Architecture 287
    Cisco DNA Assurance Data Collection Points 289
        Streaming Telemetry 290
        Network Time Travel 292
    Health Dashboards 292
        Overall Health Dashboard 293
        Network Health Dashboard 294
        Cisco SD-Access Fabric Network Health 296
        Client Health Dashboard 297
        Application Health Dashboard 299
Cisco DNA Assurance Tools 300
    Intelligent Capture 300
    Anomaly Capture 301
    Path Trace 303
    Sensor Tests 303
    Cisco AI Network Analytics 304
Summary 306
References in This Chapter 306
Glossary 307

9780136448389     TOC     6/24/2020

Om forfatteren

Jason Gooley, CCIE No. 38759 (RS and SP), is a very enthusiastic and spontaneous person who has more than 25 years of experience in the industry. Currently, Jason works as a technical evangelist for the Worldwide Enterprise Networking sales team at Cisco Systems. Jason is very passionate about helping others in the industry succeed. In addition to being a Cisco Press author, Jason is a distinguished speaker at CiscoLive, contributes to the development of the Cisco CCIE and DevNet exams, provides training for Learning@Cisco, is an active CCIE mentor, is a committee member for the Cisco Continuing Education Program (CE), and is a program committee member of the Chicago Network Operators Group (CHI-NOG), Jason also hosts a show called MetalDevOps. Jason can be found at, @MetalDevOps, and @Jason_Gooley on all social media platforms.

Roddie Hasan, CCIE No. 7472 (RS), is a technical solutions architect for Cisco Systems and has 29 years of networking experience. He has been with Cisco for more than 12 years and is a subject matter expert on enterprise networks. His role is supporting customers and account teams globally, with a focus on Cisco DNA Center and Cisco Software-Defined Access. He also specializes in technologies such as MPLS, Enterprise BGP, and SD-WAN. Prior to joining Cisco, Roddie worked in the U.S. federal government and service provider verticals. Roddie blogs at and can be found on Twitter at @eiddor.

Srilatha Vemula, CCIE No. 33670 (SEC), is a technical solutions architect for the Worldwide Enterprise Networking Sales team at Cisco Systems. There, she works with account teams and systems engineers to help Cisco customers adopt Cisco DNA Center, Cisco SD-Access, Cisco Identity Services Engine, and Cisco TrustSec. Srilatha has served in multiple roles at Cisco, including technical consulting engineer and security solutions architect. She led the design and implementation of security projects using Cisco flagship security products for key U.S. financial customers.