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The user receives the %ILPOWER-3-CONTROLLER_ERR: Controller error, Controller number [chars]: accessing failed error message on a Catalyst 3550 series switch

Core issue

The %ILPOWER-3-CONTROLLER_ERR: Controller error, Controller number [chars]: accessing failed error message means that an error reported or caused by the inline power controller was detected.

When a Cisco Catalyst 3550-24 PWR interface receives an Electrostatic Discharge (ESD) from a device (such as a powered IP phone), some interfaces go down no longer provide power.

This is a software defect and is documented in Cisco bug ID CSCea40671.

Resolution

To resolve the issue, consider these options:

  1. Issue the shutdown command, followed by the no shutdown command on the affected interfaces.

  2. Make sure that the devices are correctly grounded.

  3. Upgrade to Cisco IOS  Software Release 12.1(14)EA1 or later. These specific software releases provide an ESD recovering mechanism.

Problem Type

Syslog error message received

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