Transitioning from MPLS to SD-WAN: A Comprehensive Guide

In the ever-evolving landscape of enterprise networking, the shift from Multiprotocol Label Switching (MPLS) to Software-Defined Wide Area Network (SD-WAN) has become a strategic imperative. This transition promises enhanced flexibility, scalability, and cost-effectiveness, but navigating the complexities of implementation requires careful planning and execution. Let's delve into the intricacies of this transition, from understanding the fundamentals to crafting a seamless action plan.

Understanding the Basics: MPLS vs. SD-WAN

MPLS, a stalwart of enterprise networking for over two decades, offers reliable connectivity through a hub-and-spoke architecture. However, its rigid structure and high costs are becoming prohibitive in today's dynamic environment. Enter SD-WAN, a revolutionary approach that decouples the network control mechanism from the underlying hardware, enabling agile and efficient networking.

Why Transition from MPLS to SD-WAN?

Flexibility & Ease of Set-up: SD-WAN simplifies network expansion with its agile deployment model. Unlike MPLS, which often requires extensive coordination with service providers, SD-WAN allows for swift node deployment, facilitating rapid network scaling.

Cloud-Readiness: With the surge in cloud-based applications, traditional WAN architectures struggle to deliver optimal performance. SD-WAN seamlessly integrates with cloud services, offering improved application performance and user experience.

Cost: SD-WAN presents a cost-effective alternative to MPLS, leveraging the public internet for data transmission. By utilizing diverse connectivity options and prioritizing traffic based on business needs, SD-WAN optimizes costs while maintaining performance.

Ease of Administration: SD-WAN introduces centralized management and configuration, empowering organizations with greater control and visibility over their networks. Whether self-managed or through managed services, SD-WAN streamlines network administration, enhancing operational efficiency.

Reporting/Network Insights: SD-WAN provides comprehensive reporting and analytics capabilities, enabling organizations to monitor network performance, analyze traffic patterns, and optimize resource utilization. This visibility enhances decision-making and facilitates proactive network management.

Network Resiliency: SD-WAN enhances network resilience through built-in redundancy and dynamic traffic routing. By leveraging multiple carriers and optimizing path selection, SD-WAN minimizes downtime and ensures reliable connectivity.

Transitioning to SD-WAN: Key Considerations

1. Determine Network Requirements:

   • Assess bandwidth requirements based on application needs and user activities.
   • Understand Quality of Service (QoS) vs. Quality of Experience (QoE) to ensure optimal performance.

2. Evaluate SD-WAN Edge Node Capabilities:

   • Consider WAN interfaces, throughput capacity, and high availability options.
   • Ensure alignment with current and future network needs.

3. Choose an SD-WAN Provider Type:

   • Define managed vs. unmanaged services based on desired level of control and support.
   • Assess providers offering middle mile networks and priority application peering for optimized performance.

4. Document & Plan:

   • Document network topology, subnets, applications, and cloud resources.
   • Develop a detailed migration plan outlining PoC, testing, and full transition phases.

Action Plan for Transition

1. Proof of Concept (PoC):

   • Select a remote location for PoC deployment.
   • Evaluate equipment, procure internet services, and establish connections.
   • Conduct PoC testing to assess performance and user experience.

2. Future State Transition:

   • Expand SD-WAN deployment gradually, either site-by-site or through a major cutover event.
   • Consider hybrid MPLS-SD-WAN networks for phased transition and continued MPLS support.

3. Continuous Improvement:

   • Monitor network performance and user feedback post-transition.
   • Fine-tune configurations and optimize traffic routing as needed.

Conclusion

Transitioning from MPLS to SD-WAN is a strategic decision that requires careful planning and execution. By understanding the benefits, assessing network requirements, and choosing the right provider, organizations can unlock the full potential of SD-WAN while ensuring a smooth transition process. With the right guidance and expertise, the journey from legacy networking to SD-WAN innovation can pave the way for enhanced agility, performance, and cost-efficiency in enterprise networking.