Break and fix — your first troubleshooting walk

• Fundamentals
• Beginner
• 10 min
• 4 steps
• Cisco IOS-style

Open this lab in your browser →

Free · no install · no account

Scenario

This is the canonical troubleshooting workflow: 1. Reproduce — see the failure with your own eyes. 2. Localise — narrow it down with diagnostic shows. 3. Fix — apply the minimum change that addresses the root cause. 4. Verify — re-run the original test. The setup looks identical to the ping-and-trace lab: R1 (Gi0/0 10.0.0.1/30) cabled to R2 (Gi0/0 10.0.0.2/30). But one of the two interfaces is admin-down, so packets can't cross. No spoiler on which side. You'll find out.

Topology

2 × router · Cisco IOS-style

• R1 — router
• R2 — router

What you will do

1. From R1, ping R2 at 10.0.0.2. Watch it fail. Notice the canvas: the link renders dashed-and-red when down.

2. Run show ip interface brief on R1. Look at the Status / Protocol columns for Gi0/0.

3. Bring Gi0/0 admin-up on R1.

4. Re-run the original test: ping R2 at 10.0.0.2 from R1.

Open this lab in your browser →

More labs on this topic

• Config mode — your first configuration changesBeginner · 10 min
• EXOS break and fix — port disabledBeginner · 8 min
• EXOS config — create a VLAN, add a port, give it an IPBeginner · 10 min
• Your first ExtremeXOS switch — VLAN-centric readsBeginner · 8 min
• EXOS ping and tracerouteBeginner · 5 min
• EXOS save configuration and show configBeginner · 5 min

This lab in other languages

Break and fix — dein erster Troubleshooting-WalkBreak and fix — tu primer recorrido de troubleshootingBreak and fix — seu primeiro passeio de troubleshootingBreak and fix — ton premier parcours de troubleshootingBreak and fix — आपका पहला troubleshooting walkBreak and fix —— 你的第一次故障排查Rompi e ripara — la tua prima camminata di troubleshooting壊して直す — 最初のトラブルシューティング・ウォーク고장과 수리 — 첫 번째 트러블슈팅 워크Сломал и починил — твой первый troubleshooting-прогонBoz ve düzelt — ilk troubleshooting yürüyüşünPhá và sửa — bước đi troubleshooting đầu tiên