The global or per-port PoE budget is insufficient when multiple devices draw power simultaneously.
Likely causes
- PoE budget exceeded
- Secondary power supply missing
- High negotiated PoE class
- Degraded cabling
Checks in priority order
- Read per-port PoE consumption
- Compare with total budget
- Check power supplies
- Test cable and switch port
When to escalate
Escalate when the failure affects multiple users, a production dependency is unavailable, or logs show a component outside your control. Include timestamps, scope, tests already performed, and the last known working state.