Simplifying Cisco SD-WAN Troubleshooting: Tips You Can Actually Use

Let’s talk about something we all deal with — troubleshooting. Whether you’re just getting started with Cisco SD-WAN or you’ve been in the trenches for years, troubleshooting can feel overwhelming. But it doesn’t have to be! I’ve rounded up some practical, real-world tips to make your life easier and your network stronger.

1. Your Dashboard is Your Best Friend Think of the vManage dashboard as the cockpit of your plane. It’s where you monitor, tweak, and keep things flying smoothly. Make sure you’re comfortable with:

• Live Monitoring: Keep tabs on your devices and links in real-time.
• Alerts: Catch issues early by setting up notifications.
• Templates: Simplify configuration changes for all your devices.

Pro Tip: The "Monitor > Network" view gives you a bird’s-eye perspective. Use it to quickly spot and address trouble spots.

2. Don’t Forget the CLI The vManage GUI is awesome, but sometimes the CLI is the only way to get to the heart of the issue. Commands like show control connections and show interface statistics can reveal what the GUI might miss.

A Few CLI Gems:

• show ip route: Double-check your routing.
• show sdwan bfd sessions: See how your links are holding up.
• show control local-properties: Troubleshoot control plane connectivity.

3. Understand the Overlay-Underlay Relationship One of the most common issues comes from the overlay and underlay not playing nicely together. Here’s what to check:

• Are your IPsec tunnels up?
• Do your MTU settings avoid fragmentation?
• Is your underlay routing behaving?

Quick Tip: Use packet capture tools (built into vManage or external ones like Wireshark) to dig deeper into traffic flows.

4. Fine-Tune Application-Aware Routing Nobody likes a laggy application. If performance is off, look at your Application-Aware Routing (AAR) policies. Ask yourself:

• Are your SLA settings realistic?
• Do the application paths make sense?
• Is there anything unusual in the historical data?

Pro Tip: Check out the "Monitor > Applications" tab in vManage to pinpoint exactly what’s going on.

5. Logs Are Your Lifeline Logs tell the story of your network. If you’re troubleshooting, start here. Ensure you’ve enabled logging and centralized them for easy access.

• Use real-time logs to track live events.
• Switch to diagnostics mode for a deeper dive.

Handy Tool: The "Troubleshoot" section in vManage can retrieve logs and run health checks for you.

6. Share What You Learn No one works alone in networking. Collaborate with your teammates and share what you’ve uncovered. And don’t forget to document solutions — your future self will thank you!

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A Final Thought: Troubleshooting doesn’t have to be a headache. With the right tools, a bit of know-how, and a willingness to dive in, you can keep your network humming. Remember, every problem solved is another skill in your toolkit.

What’s your go-to troubleshooting tip? Drop it in the comments — let’s learn from each other!

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