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Solution #

K93042412

Title

Unable to supply inline power to IP phones when hard-coding the ports to 100Mbps/Full in a Cisco Catalyst Switch with Power over Ethernet (PoE)

Core issue

Whenever the ports are configured for 100Mbps/Full-duplex, the IP phone does not power up. However, when the port is set to auto/auto it does power up.

Resolution

This is not an IOS® bug or IOS defect. It is by design.

Hence, in order to power up PoE devices (including access points), speed and duplex settings on the switch need to be set to auto/auto mode.

Problem Type

Configuration attempt fails

Problem frequency

After configuration change

Catalyst switch

Catalyst 6000 series switches

Catalyst 6500 series switches

Catalyst 3550 series switches

Catalyst 3560 series switches

Catalyst 3750 series switches

Catalyst 4500 series switches

Software features

Power Inline Consumption

Device connected to switch

Cisco IP Phone

Direct URL

http://www.ciscotaccc.com/lanswitching/showcase?case=K93042412



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