4:03
What is SD-WAN?
HPE
Overview
This video explains Software-Defined Wide Area Networking (SD-WAN) as a modern solution to the limitations of traditional WAN technologies like MPLS. It highlights how SD-WAN improves performance, reduces costs, and simplifies management by intelligently routing traffic over various network links, optimizing for cloud applications, and consolidating branch hardware. The core benefit is a more agile, secure, and efficient network designed for today's cloud-centric environment and the foundation for SASE.
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Chapters
- Traditional WANs often rely on MPLS, which is expensive and offers limited bandwidth.
- MPLS is rigid, making network changes and new branch deployments slow (weeks or months).
- Legacy WANs are not designed for cloud services, forcing traffic back to a data center before going to the internet.
- This inefficient routing increases latency and degrades application performance for cloud-based tools.
Understanding the drawbacks of MPLS is crucial for appreciating why a new technology like SD-WAN is necessary and what problems it aims to solve.
Traffic from a branch office accessing Microsoft 365 must travel to the data center and then back out to the internet, causing delays.
- Branch offices often accumulate numerous single-purpose devices (routers, firewalls, WAN optimizers) from different vendors.
- Managing this diverse hardware requires specialized on-site IT expertise.
- Pushing consistent security policies across many locations manually is slow, error-prone, and creates security gaps.
This complexity leads to inefficiencies, increased costs, and security vulnerabilities, highlighting the need for a simplified and centralized management approach.
Manually configuring security rules on dozens or hundreds of individual firewalls at different branch locations.
- SD-WAN uses software to manage the WAN, leveraging multiple connection types (broadband, 5G, MPLS, satellite).
- It intelligently selects the best path for traffic based on real-time conditions, mitigating issues like packet loss and jitter.
- SD-WAN improves application performance and user experience while potentially lowering costs compared to MPLS-only solutions.
- Its software-based nature simplifies adding new locations, applications, and policy changes.
SD-WAN offers a flexible, cost-effective, and performance-enhanced alternative to traditional WANs, directly addressing the challenges of modern network demands.
Continuously selecting the optimal path for video conferencing traffic to minimize latency and ensure smooth calls.
- SD-WAN is built for the cloud era, capable of identifying applications from the first packet.
- It intelligently directs traffic directly to cloud services (like SaaS apps) or Security Service Edge (SSE) solutions, avoiding inefficient data center backhauling.
- SD-WAN provides a strong foundation for Secure Access Service Edge (SASE) architectures.
- It integrates with major cloud providers (AWS, Azure, Google Cloud) to optimize the initial connection ('first mile').
This cloud-native approach ensures optimal performance for cloud applications and is essential for implementing modern, integrated security frameworks like SASE.
Steering Microsoft Teams traffic directly to the cloud for better performance, instead of routing it through the company data center.
- Secure SD-WAN appliances consolidate multiple branch devices into a single unit.
- These integrated devices provide advanced security features like intrusion prevention and URL filtering.
- Centralized management allows IT to push consistent security policies across all locations from one console.
- This eliminates manual, site-by-site configuration, reducing errors and improving security posture.
SD-WAN simplifies branch IT by reducing hardware complexity and centralizing security management, leading to greater operational efficiency and a stronger security stance.
A single SD-WAN device at a branch office performing the functions of a router and a next-generation firewall, managed remotely.
Key takeaways
- Traditional MPLS networks are expensive, slow to deploy, and ill-suited for cloud traffic patterns.
- Managing multiple, disparate hardware devices at branch locations creates complexity, cost, and security risks.
- SD-WAN intelligently routes traffic over diverse links, optimizing performance and reducing latency for cloud applications.
- SD-WAN simplifies network management and security by enabling centralized control and policy deployment.
- SD-WAN is a foundational technology for adopting cloud-first strategies and Secure Access Service Edge (SASE).
- By consolidating branch hardware, SD-WAN reduces equipment sprawl and associated management overhead.
- SD-WAN offers a more cost-effective and agile solution compared to traditional WAN architectures.
Key terms
SD-WANMPLSWANLatencyBandwidthSaaSSASESSEPacket LossJitterFirewallIntrusion PreventionURL FilteringMicro-segmentation
Test your understanding
- What are the primary limitations of traditional MPLS networks that SD-WAN aims to address?
- How does SD-WAN improve application performance for cloud-based services compared to legacy WANs?
- What is 'equipment sprawl' in the context of branch offices, and how does SD-WAN mitigate it?
- Explain how SD-WAN contributes to a SASE architecture.
- What are the benefits of managing security policies centrally in an SD-WAN environment?