Check the power supply of the PoE switch

You can check a switch's PoE power supply using CLI commands like show power inline, WebUI monitoring, and physical PSU indicators to verify power allocation, consumption, and health.Using CLI Commandsshow power inlineDisplays the PoE status for each port, including power allocated and consumed by connected devices.Shows the total available power and how much is currently in use, helping you monitor the switch's power budget and detect potential overloads .show switch interface inline-statusProvides a detailed view of PoE on all interfaces or a specific interface, showing the exact power delivered to each port .show power inline consumptionReports the power consumption of each connected PoE device, useful for verifying that devices are receiving sufficient power .Additional Commands for Troubleshootingshow power inline faulty – Lists any ports or devices with PoE issues.show power inline police – Displays power policing settings that may limit PoE delivery .For modular switches, show power inline module can check PoE status per module .Using WebUIModern switches, such as Cisco Catalyst 9000 series, include an embedded WebUI that visually displays PSU status, port-by-port PoE allocation, and total power usage.This interface allows monitoring without CLI access and provides a quick overview of power distribution and available budget .Physical PSU ChecksLED Indicators:"AC OK" indicates stable input voltage."PS OK" confirms the PSU is delivering proper output .Wattage Labels: Check the PSU label for maximum power (e.g., 350W, 715W, 1100W) to ensure it meets your PoE requirements.Redundant PSUs: For critical deployments, verify that dual PSUs are installed to maintain uptime during maintenance or failures .Best PracticesEstimate total PoE load including access points, IP cameras, and VoIP phones, and ensure the PSU wattage is sufficient with 20–30% headroom .Regularly monitor via CLI or WebUI to detect failing PSUs or capacity issues before they impact operations .Align PSU health checks with hardware lifecycle planning and consider redundancy for high-density PoE deployments . By combining CLI commands, WebUI monitoring, and physical inspection, you can effectively check the PoE power supply of your switch, ensure devices receive adequate power, and proactively troubleshoot potential issues.