SASE transition: what should WAN teams change first?

TL;DR: EMA’s 39-page April 2026 report, published via Versa Networks, examines how enterprises are moving from SD-WAN to SASE as the old divide between connectivity and security breaks down, and it highlights benchmark data, transition timelines, and vendor selection priorities. The architectural shift is now a governance problem as much as a networking one: identity, access, and service-model decisions increasingly determine whether the transition is manageable or fragmented.

Editorial analysis by NHI Mgmt Group, based on content published by Versa Networks: “WAN Transformation 2026: Best Practices for Evolving from SD-WAN to SASE”.

Key questions

Q: How should security teams choose between SASE and SD-WAN?

A: Choose SD-WAN when the primary problem is traffic engineering, branch connectivity, or WAN simplification.

Q: When does SASE create more complexity than it removes?

A: SASE adds complexity when organisations adopt it without aligning service model, ownership, and enforcement boundaries.

Q: What are the signs that WAN modernisation is failing?

A: Warning signs include inconsistent policy enforcement, unclear escalation paths, duplicated control ownership, and repeated debates over which team owns a change or incident.

Practitioner guidance

• Clarify policy ownership across teams Define which team owns access policy design, enforcement exceptions, and incident escalation before changing the WAN operating model.
• Assess service model accountability Compare managed, co-managed, and self-operated SASE models by who controls telemetry, configuration change, and response workflows.
• Align identity inputs to enforcement points Verify that identity, device posture, and application context are available where access decisions are enforced, not only in upstream systems.

Bottom line: The report frames SD-WAN to SASE migration as an architectural and governance shift, not a simple platform replacement.

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