Disconnect the PoE cable between the Ethernet switch port and the PD that cannot supply power. If the PD can still supply power after connecting to other PoE ports, some ports are faulty. When a problem occurs with PoE, in most cases, the error symptom can be simply shown as the PoE switch not providing power, and the powered devices will stop working. Follow these steps when the trouble is on only one switch. This guide provides a step-by-step troubleshooting framework focusing on Cisco Catalyst switches (notably the 9300 and 2960 series), covering error categories, CLI commands, model-specific insights, and preventive measures. However, PoE setups can encounter various issues. Here are some common PoE issues and how to troubleshoot them: 1. PoE errors on the device seen on CLI.
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