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Cisco Bug: CSCup78439 - Connecting IP Phone to any AP702 LAN Ports results in AP reset loop

Last Modified

Nov 19, 2018

Products (1)

  • Cisco Aironet 3700 Series Access Points

Known Affected Releases


Description (partial)

When the AP is getting PoE from switch and phone is connected to AP port1, 2 or 3 powered by adapter/injector the following occurs:
AP detects the phone and generates the following CDP:
*Jul  8 12:49:25.071: %CDP_PD-4-POWER_OK: Full power - INJECTOR_DETECTED_MULTIPLE_MACS_ON_HUB inline power source

The switch cuts power to the AP and bounces the port

Connect an IP phone (9971 or similar) powered by AC adapter or power injector to any LAN port 1-3.
Be sure the AP is powered by PoE from the switch.
Be sure CDP is enabled on the switch port where the AP is connected.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
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