El error que rompe OSPF: Router ID y Adyacencias | CCNA 2026

Is your OSPF network not working? 🚨 In this video, you'll learn the critical concepts every network engineer needs to master for the 2026 CCNA exam: Router ID and OSPF adjacencies. We thoroughly explain what Router ID is, how it's chosen, and why it's the cornerstone of the protocol. We also analyze, step by step, the phases two routers go through to establish an adjacency (Down, Init, Two-Way, ExStart, Exchange, Loading, and Full) and what common errors halt this process. Finally, we conduct a hands-on lab in Cisco Packet Tracer where we configure and force Router ID selection on real Cisco equipment. Don't let OSPF be a headache! What you'll learn in this video: ✅ What Router ID is in OSPF and its priority. ✅ Router ID selection process (Manual vs. Loopback vs. Physical Interface). ✅ The 7 OSPF adjacency states explained. ✅ Adjacency troubleshooting: Why is it stuck in Init or ExStart? ✅ Step-by-step Cisco Packet Tracer lab. Video chapters: 00:00 Introduction to the video 01:10 What will we see in the video? 01:38 What is the Router ID in OSPF? 03:12 Router ID Election Process 03:56 OSPF Adjacencies Phases (From Down to Full) 05:55 Requirements for Establishing Adjacencies in OSPF 08:04 Hands-on Lab in Cisco Packet Tracer 11:32 How to Verify the Router ID in OSPF 15:12 How to Modify the Router ID Useful Resources: 📌 CCNA 2026 Course:    • Curso CCNA 200-301 (2025) GRATIS: Aprende ...   #PedroLinoCáceres #OSPF #CCNA #Cisco #Networking #PacketTracer #RouterID #CiscoNetworks #CCNA2026 #NetworkEngineering #OSPFAdjacencies