The moto for the lab is "What will you do if a BFD session went down and you unable to solve it with basic tools?" The walk-in lab provides an extensive hands-on practice on troubleshooting IPSec/BFD issues in a Cisco Catalyst SD-WAN network. The lab is based on multi-year TAC experience and contains multiple advanced real-life scenarios resulting in various types of data-plane outages. The scenarios are created with gradual increase in complexity from basic to quite complex and sophisticated "puzzles". The goal for the lab is to challenge and educate Cisco customers on not-so-well-known Catalyst SD-WAN data-plane aspects, along with the most effective troubleshooting strategies and tools. The lab is at advanced level and heavily CLI-based. Basic understanding of Catalyst SD-WAN operations is required. Cisco IOS XE SD-WAN CLI-experience is highly recommended. The main audience is network architects, consultants, engineers, and network designers who are seeking a deeper level of knowledge about SD-WAN forwarding to avoid common mistakes in their day-to-day operations, design, and deployment activities while dealing with a Cisco SD-WAN solution.