Quick troubleshooting view
The global or per-port PoE budget is insufficient when multiple devices draw power simultaneously.
- PoE budget exceeded
- Secondary power supply missing
- High negotiated PoE class
- Read per-port PoE consumption
- Compare with total budget
- Check power supplies
Contextual technician plan
Perform this check and preserve the observed result before changing configuration.
The affected ports should stay below their per-port limit and the switch total PoE draw should retain headroom during the failing scenario.
If per-port and total budgets remain within limits, lower the PoE-capacity hypothesis and compare PSU, cabling and port events.
If a port or the total budget reaches its limit, keep the measured values and rebalance or increase PoE capacity before changing unrelated network settings.
Perform this check and preserve the observed result before changing configuration.
The affected ports should stay below their per-port limit and the switch total PoE draw should retain headroom during the failing scenario.
If per-port and total budgets remain within limits, lower the PoE-capacity hypothesis and compare PSU, cabling and port events.
If a port or the total budget reaches its limit, keep the measured values and rebalance or increase PoE capacity before changing unrelated network settings.
Perform this check and preserve the observed result before changing configuration.
The affected ports should stay below their per-port limit and the switch total PoE draw should retain headroom during the failing scenario.
If per-port and total budgets remain within limits, lower the PoE-capacity hypothesis and compare PSU, cabling and port events.
If a port or the total budget reaches its limit, keep the measured values and rebalance or increase PoE capacity before changing unrelated network settings.
Repeat the same validation test after the correction and confirm the original symptom is gone. Validate stability before closing the incident.
Before changing configuration, record the current value and a way back.
Escalate if several PoE ports drop simultaneously despite a sufficient measured budget or if the switch reports PSU/thermal faults.
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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.