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1. Traditional Campus Network Challenges Managing legacy enterprise networks introduces massive operational overhead due to manual workflows and fragmented toolsets. Configuration & Deployment Challenges Manual & Box-by-Box: Setting up switches requires manual...

1. Underlay vs. Overlay: The Core Architecture An SD-Access fabric works by running a virtual logical network (the Overlay) on top of a physical hardware network (the Underlay). Feature Underlay Network (The Physical Foundation) Overlay Network (The Virtual Fa...

1. The Three Planes of SD-Access Instead of a traditional routing model, SD-Access splits network functions into three distinct planes: Control Plane (LISP): Moves the destination routing database to a centralized mapping system (similar to DNS). It tracks end...

1. The Core Concept: EID vs. RLOC In traditional IP networking, an IP address represents both identity (who the host is) and location (where the host is connected). This dual-nature severely limits security, subnet stretching, and IP mobility. LISP solves this...

1. Why SD-Access Uses VXLAN Instead of LISP for the Data Plane Although LISP is used to manage the control plane, it has a key limitation that makes it unusable for the data plane on its own: LISP Header Limitation: LISP only supports Layer 3 overlays because ...

1. The Policy Plane Framework In a Cisco SD-Access fabric, operational duties are cleanly split across three specialized planes: the control plane runs on LISP, the data plane runs on VXLAN, and the policy plane runs on Cisco TrustSec. Role of VXLAN Headers: T...

1. Core Solution Components Cisco SD-Access provides automated, end-to-end user, device, and application segmentation without requiring a physical network redesign. This architecture relies on two primary components: Cisco DNA Center (DNAC): The central automa...

Applications used by enterprise organizations have evolved over the past several years. As a result, the enterprise WAN must evolve to handle the rapidly changing needs placed on it by these new resource-consuming applications, as shown in the following figure...

1. Core SD-WAN Architecture Concepts Role Separation: The Cisco Catalyst SD-WAN solution separates operational planes to build a highly scalable, secure, and efficient network fabric. Virtualization of Routing: It is based on the same routing principles used o...

The management plane provides control and visibility to the entire fabric. It has the following characteristics: Single pane of glass for Day 0, Day 1, and Day 2 operations Real-time alerting Centralized provisioning Configuration standardization Simplicity of...

The orchestration plane is responsible for zero-touch deployment and security validation during deployment. It has the following characteristics: Performs initial authentication Orchestrates the connectivity between the management, control, and data plane Requ...

Cisco Catalyst SD-WAN Controllers provide a highly resilient, scale-out control plane for the SD-WAN fabric. Key Characteristics Fabric Discovery & Control: Facilitates fabric discovery and distributes control plane information, data plane policies, and applic...

The Cisco Catalyst SD-WAN data plane is responsible for tunnel establishment and data forwarding within the fabric. The main characteristics of the data plane with Cisco Catalyst SD-WAN Edge routers are as follows: Provides secure data plane with other WAN Edg...

Cisco Catalyst SD-WAN software provides a REST API, a programmatic interface for controlling, configuring, and monitoring the Cisco Catalyst SD-WAN devices in an overlay network. You can access the REST API through the Cisco Catalyst SD-WAN Manager web server....

The Cisco Catalyst SD-WAN Analytics platform provides graphical representations of the performance of your entire Cisco Catalyst SD-WAN overlay network over time and enables you to drill down to the characteristics of a single carrier, tunnel, or application a...

Cisco IOS XE is a single image that can be used to deploy both IOS XE and IOS XE SD-WAN on supported platforms. Cisco IOS XE now supports the use of a single "universalk9" image to deploy Cisco IOS XE SD-WAN and Cisco IOS XE functionality on the following devi...

The Cisco Catalyst SD-WAN architecture provides maximum flexibility regarding the deployment of the controllers. You can deploy the three controller types (Cisco Catalyst SD-WAN Manager, Cisco Catalyst SD-WAN Controller, and Cisco Catalyst SD-WAN Validator) ac...