How a Tier-1 Bank Centralized Monitoring for Over 2500 Branches Using Trisul

Why Precision Matters

In large-scale distributed networks especially in sectors like banking, precision isn’t a luxury, it’s a necessity. Whether it’s a link degradation at a remote branch or a burst of traffic impacting the business-critical applications, the ability to pinpoint issues at the exact moment they occur can make the difference between smooth operations and costly downtime.

Applying traditional SNMP-based network traffic monitoring approaches to SD-WAN environments often lacks the special visibility needs of such large environments. Many SD-WAN vendors do provide SNMP-type interface counts for all SD-WAN devices from the SD-WAN controller itself usually via a REST API. This however is provided in a summarized 1-hour window. Without high-resolution data, bandwidth surges are lost in aggregation leading to blindspots. It is like looking at a weather report that says “mild” while you’re standing in a thunderstorm. For organizations, managing thousands of locations and multiple ISPs, this limitation can lead to delays in detecting anomalies and delays in resolution.

That’s where Trisul comes in.

What Was The Customer Looking For?

A prominent Indian banking giant with a nationwide SD-WAN footprint of over 2500 SD-WAN branches faced growing challenges in managing its hybrid Wide Area Network. Each branch relied on multiple WAN links, sourced from providers like Airtel, BSNL, Jio, etc. The network team was tasked with:

• Monitor every SD-WAN device along with non-SD-WAN at full precision
• Monitor each WAN link separately and in real-time
• Gain insight into traffic behavior at each branch per WAN with Top Talkers such as NBAR/AppID applications
• Improve troubleshooting speed and reporting accuracy
• Track performance per provider to manage SLAs and link quality
• Automatically deliver relevant reports per WAN provider over email

While they had deployed a mainstream SD-WAN platform, they soon realized visibility via the API was going to be a problem. The 1-hour interface count summaries were too coarse to detect real-time spikes or sudden changes in traffic patterns. The lack of high fidelity visibility meant troubleshooting was often reactive, and slow. With Trisul NetFlow Analyzer they were able to achieve deep visibility.

Why They Choose Trisul?

Trisul’s team engaged with the bank and began by understanding the operational pain points, not just pushing features. Our response was a tailored solution that delivered precise, tailored real-time views, something traditional SD-WAN tools simply couldn’t offer.

One powerful feature that changed everything was Custom Key Monitors.

With Custom Key Monitors, the bank could:

• Create lists of assets that need to be monitored separately. In this case, we created WAN Asset Lists per upstream ISP provider.
• Track traffic on each interface in real-time across all 2500 branches. All of this is from NetFlow feeds only.
• Isolate flows per provider- Airtel, Jio, BSNL- by creating custom views.
• Monitor each WAN link as a separate entity regardless of transport technology (Fiber, LTE)
• Build custom dashboards and reports aligned with operational and compliance requirements.
• Fetch data insights by branch, region, or provider enabling highly targeted decision making
• Automatically Email daily monthly and weekly performance reports for WAN service assurance purposes.

This level of granularity helped the bank understand the true behavior of every link, especially under high loads or during failovers, something standard SD-WAN platforms couldn’t offer.

What Was Their Experience?

Trisul became the bank’s real-time network intelligence layer. By setting up Custom Key Monitors, their IT team could visualize and analyze traffic at the interface level for each branch and each service provider.

Key improvements included:

• Immediate detection of traffic surges and bandwidth spikes, even on backup VSAT links

• A precise view of how each ISP link was performing across any time window

• Custom reports that mapped directly to internal KPIs and compliance checklists

• Reports tailored for operations, compliance, or regional analysis- generated in minutes

This allowed the team to respond faster, optimize more confidently, and eliminate time wasted chasing averaged-out issues.

How Our Solution Delivered Results?

• Real-time interface-level monitoring

Each WAN link across all branches was tracked in real-time, not just in 1-hour buckets

• Custom key monitors

Allowed the team to define and monitor specific traffic flows per interface creating custom views and alerts that mirrored their organizational structure.

• Provider-level insight

Interface from Airtel, Jio, BSNL, etc were monitored separately offering SLA insights and performance breakdowns by region or branch.

• Precision spike detection

Trisul captured traffic patterns as they happened, not as smoothed out on average– making it possible to detect and resolve issues faster

• Targeted reporting

Custom dashboards and reports could be filtered by branch, link type, provider, or timeframe– delivering actionable data to the right teams.

Key Results

1. 80% faster issue resolution, driven by real-time, per-link analytics
2. 50% improvement in report turnaround time iwth automated , stakeholder -specific formats
3. Full visibility into every branch and every ISP link– no blind spots
4. Bandwidth optimized using precise flow data instead of static thresholds
5. No external tools required- Trisul handled analytics, monitoring, and reporting in one place

Conclusion

In complex, distributed networks, averages can hide the truth. To manage performance, SLAs, and bandwidth intelligently, organizations need visibility that’s granular, real-time, and tailored to how they operate.

With Trisul and its Custom Key Monitors, this banking institution gained:

• Real-time, per-interface traffic visibility
• Custom views aligned with their operational and compliance needs
• High-resolution data that turned their network from a black box into an open book

Precision became their superpower.

Yours could be next.

---