Network Troubleshooting

Troubleshooting Principles

1. Define the problem — What exactly is broken? Who reported it? What's the expected vs actual behavior?
2. Gather facts — Run show commands, check logs, verify config. Never assume.
3. Consider possibilities — Based on facts, list likely causes
4. Create action plan — Test one variable at a time
5. Implement and verify — Make one change, verify, document
6. Document — Record what was found and what fixed it

Symptom: "I Can't Reach X" (Connectivity Loss)

Layer 1: Physical

PYATS_TESTBED_PATH=$PYATS_TESTBED_PATH python3 $MCP_CALL "${PYATS_PYTHON:-python3} -u $PYATS_MCP_SCRIPT" pyats_run_show_command '{"device_name":"R1","command":"show interfaces"}'