Configuring Your Cisco 9300 or 9400 Switch for PoE+

To Include PoE+ Devices Like the PoE to USB-C Converter for Surface Go, iPad Pro, Samsung Tab, or Any USB-C device

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Running Into Charging Issues with Your PoE+ to USB-C Converter or Other PoE Devices?

There’s a little known default feature in your Cisco enterprise switch that prevents you from getting the most out of your PoE+ devices, especially when using a PoE+ to USB-C converter for iPad Pro, Surface Go, Samsung Tab, and other devices.

While your Cisco 9400 or 9300 models switch is rated for PoE+ and capable of negotiating PoE+ class 4 devices, it will default to only negotiating 15.4 watts with your PoE converter unless you configure your switch for 2 event classification.  Most USB-C devices, including the Surface Go and Surface Go 2, require 18 watts or more to charge properly.

In that case, you’ll know the default setting is wrong because:

1 – You’ll see the port only negotiates 15.4 watts of power

2 – Your USB-C device will either not charge properly or will begin to lose battery charge even if it shows it is charging

Configuring Your Enterprise Switch for 2 Event Classification

Fortunately, it’s a quick, well-documented setting you just need to update for the ports you’re planning to use for your PoE+ device.  You can find the instructions from Cisco here:

2 EVENT CLASSIFICATION

Or just go to your switch terminal and follow these steps:

Switch> enable

Switch# configure terminal

Switch(config)# interface gigabitethernet2/0/1

Switch(config-if)# power inline port 2-event

Switch(config-if)# end

 

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