IT Company ka WAN modernization – SD-WAN Case Study

Imagine a Bangalore‑based IT services firm, 500 employees spread across 4 offices and a growing remote workforce. Their existing MPLS network, costing ₹12 lakh per month, was choking on latency whenever developers pushed code to Azure or AWS, and the VPN gateways kept crashing during peak WFH hours. The CTO, Priya, faced escalating complaints and a looming budget cut, yet the vendor contracts made a quick switch feel impossible.

Why MPLS was no longer viable

Traditional MPLS offered guaranteed bandwidth, but it lacked the agility needed for modern cloud‑first applications. Every new branch meant a fresh lease line negotiation, adding 2‑3 weeks of lead time and extra CAPEX. Moreover, the static routing model forced all traffic—whether internal or cloud bound—through a central hub, creating a single point of congestion. In practice, Priya’s team saw average round‑trip times of 120 ms to Azure, while a direct internet path would have been under 40 ms.

Evaluating alternatives: From broadband to SD‑WAN

Priya’s shortlist included generic broadband, LTE, and several SD‑WAN vendors. The key criteria were:

• Seamless cloud integration (Azure, AWS)
• Zero‑touch provisioning for new sites
• Transparent failover for remote workers
• Clear cost model with SLA backing

After a series of PoCs, Tata SD‑WAN iFLX emerged as the only solution that could guarantee a 99.9% uptime SLA with financial credit on breach—something most generic providers only promise qualitatively.

Implementation roadmap – from MPLS to SD‑WAN

The migration was planned in three phases:

Phase 1: Site audit & design

Positive Communication ke engineers ne free site survey ki, aur 2 ghante ke andar ek detailed network diagram deliver kiya. Existing MPLS circuits were mapped, aur har office ke bandwidth requirement ko 1 Gbps ki ILL (Internet Leased Line) ke saath pair kiya—₹90,000 per month (GST extra) for the headquarter, aur 200 Mbps for smaller sites (₹35,000/mo). This static IP setup allowed the SD‑WAN edge devices to establish secure tunnels instantly.

Phase 2: Edge deployment & policy configuration

Each office received a compact iFLX appliance. Zero‑touch provisioning meant that once the device was plugged in, it auto‑registered with the cloud controller, fetched the QoS policies, aur traffic ko direct Azure/AWS endpoints ke liye optimal path pe route kar diya. Priya ko bas ek dashboard mil gaya jahan se wo real‑time latency aur packet loss monitor kar sakti thi.

Phase 3: Remote worker enablement

Home users were given a lightweight SD‑WAN client that leveraged the same policy engine. The solution auto‑detected the best ISP (broadband ya 4G) and switched over without dropping the VPN. Result? 95% of remote sessions reported sub‑50 ms latency to cloud services, compared to 180 ms earlier.

Performance & cost impact – the hard numbers

Overall, the company saved roughly 40% on connectivity spend while achieving a 62% reduction in cloud latency. The financial credit clause on SLA breach added an extra safety net—Priya ke liye peace of mind ka factor tha.

Key benefits beyond numbers

Scalability: Adding a new branch in Hyderabad required only a broadband connection and an iFLX device. No new MPLS circuits, no lengthy negotiations.

Security: End‑to‑end encryption is built‑in, aur static IPs from Tata ILL made firewall whitelisting simple.

Operational simplicity: The cloud‑native controller gave Priya visibility across all 500 users, enabling proactive bandwidth adjustments during product launches.

Lessons learned & best practices

1. Start with a pilot. A single office migration helped fine‑tune QoS policies before a full roll‑out.

2. Align SLAs with business impact. The 99.9% credit clause turned a technical metric into a financial guarantee.

3. Leverage existing ILL investments. Using Tata’s Internet Leased Line for static IPs reduced the need for separate VPN appliances.

4. Educate remote users. A short onboarding video on the SD‑WAN client cut support tickets by 30%.