1-6
z 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.
z 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.
z Generally, the refresh update mode is used to upgrade the PSE processing software.
z 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
port or all ports of the device display poe interface
[ interface-type interface-number ]
Display the PoE power information
of a specific port or all ports of the
device
display poe interface power
[ interface-type interface-number ]
Display the PSE parameters display poe powersupply
Available in any view
PoE Configuration Example
Networking requirements
As shown in Figure 1-1, Switch A supports PoE, Switch B can be PoE powered.
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.
z The PSE processing software of Switch A is first upgraded online. The remotely accessed PDs are
powered by Switch A.
z The power consumption of the accessed AP is 2,500 mW, and the maximum power consumption
of Switch B is 12,000 mW.
z 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.