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In the case that the PSE processing software is damaged (that is, no PoE command can be executed successfully), use the full update mode to upgrade and thus restore the software.

The refresh update mode is to upgrade the original processing software in the PSE through refreshing the software, while the full update mode is to delete the original processing software in PSE completely and then reload the software.

Generally, the refresh update mode is used to upgrade the PSE processing software.

When the online upgrading procedure is interrupted for some unexpected reason (for example, the device restarts due to some errors), if the upgrade in full mode fails after restart, you must upgrade in full mode after power-off and restart of the device, and then restart the device manually. In this way, the former PoE configuration is restored.

Displaying and Maintaining PoE Configuration

 

To do…

Use the command…

Remarks

 

Display the PoE status of a specific

display poe interface

 

 

port or all ports of the device

[ interface-type interface-number ]

 

 

 

 

 

 

Display the PoE power information

display poe interface power

Available in any view

 

of a specific port or all ports of the

 

[ interface-type interface-number ]

 

 

device

 

 

 

 

 

 

 

 

 

Display the PSE parameters

display poe powersupply

 

 

 

 

 

PoE Configuration Example

PoE Configuration Example

Networking requirements

As shown in Figure 1-1, Switch A supports PoE, Switch B can be PoE powered.

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z

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z

The GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 ports of Switch A are connected to Switch B and an AP respectively; the GigabitEthernet 1/0/8 port is intended to be connected with an important AP.

The PSE processing software of Switch A is first upgraded online. The remotely accessed PDs are powered by Switch A.

The power consumption of the accessed AP is 2,500 mW, and the maximum power consumption of Switch B is 12,000 mW.

It is required to guarantee the power feeding to the PDs connected to the GigabitEthernet 1/0/8 port even when Switch A is under full load.

1-6

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3Com WX3000 PoE Configuration Example, Displaying and Maintaining PoE Configuration, Networking requirements