KB.15.15

Example 73 PoE status of ports

If you want to view the PoE status of ports A6 and A7, you would use show

power-over-ethernet A6-A7 to display the data:

Figure 47 show power-over-ethernet port-list output

Planning and implementing a PoE configuration

This section provides an overview of some considerations for planning a PoE application. For

additional information on this topic, refer to the PoE Planning and Implementation Guide which is

available on the HP Networking web site at www.hp.com/networking/support.

Some of the elements you may want to consider for a PoE installation include:

• Port assignments to VLANs

• Use of security features

• Power requirements

This section can help you to plan your PoE installation. If you use multiple VLANs in your network,

or if you have concerns about network security, you should read the first two topics. If your PoE

installation comes close to (or is likely to exceed) the system’s ability to supply power to all devices

that may request it, then you should also read the third topic. (If it is unlikely that your installation

will even approach a full utilization of the PoE power available, then you may find it unnecessary

to spend much time on calculating PoE power scenarios.)

Power requirements

To get the best PoE performance, you should provide enough PoE power to exceed the maximum

amount of power that is needed by all the PDs that are being used.

By connecting an external power supply you can optionally provision more PoE wattage per port

and or supply the switch with redundant 12V power to operate should an internal power supply

fail.

By installing a second power supply in the 5406zl/8206zl or a third power supply in a

5412zl/8212zl chassis, depending on how many PoE ports are being supplied with power, the

switch can have redundant power if one power supply fails. A Power Supply Shelf (external power

122 Power Over Ethernet (PoE/PoE+) Operation