With this setting, if module B is allocated 100 watts of PoE power and is using 68 watts, and then another PD is
connected to the module in slot B that uses 8 watts, the 70% threshold of 70 watts is exceeded. The switch sends
an SNMP trap and generates this Event Log message:
Slot B POE usage has exceeded threshold of 70%.
If the switch is configured for debug logging, it also sends the Event Log message to the configured debug
destination(s).
On any PoE module, if an increasing PoE power load (1) exceeds the configured power threshold (which triggers
the log message and SNMP trap), and then (2) later decreases and drops below the threshold again, the switch
generates another SNMP trap, plus a message to the Event Log and any configured Debug destinations.
To continue the preceding Example:, if the PoE power usage on the PoE module in slot B drops below 70%,
another SNMP trap is generated and you will see this message in the Event Log:
Slot B POE usage is below threshold of 70%.
For a message listing, please see the event log message reference guide for your switch. Go to
; auto search the model number for your switch, for Example: “Aruba Switch 2920”,
then select the device from the list and click on
Product manuals
. Click on the “User guide” link under
Manuals
.
(Default Global PoE Power Threshold:
80
). By using the
[slot <
slot-id-range
>]
option, you can specify
different notification thresholds for different PoE modules installed in the switch. For example, you could set the
power threshold for a PoE module in slot “A” to 75% and the threshold for the module in slot “B” to 68% by
executing the following two commands:
switch(config)# power-over-ethernet slot a threshold 75
switch(config)# power-over-ethernet slot b threshold 68
NOTE:
The last
threshold
command affecting a given slot supersedes the previous threshold
command affecting the same slot. Thus, executing the following two commands in the order shown
sets the threshold for the PoE module in slot “D” to 75%, but leaves the thresholds for any PoE
modules in the other slots at 90%.
switch(config)# power-over-ethernet threshold 90
switch(config)# power-over-ethernet slot d threshold 75
If you reverse the order of the above two commands, all PoE modules in the switch will have a
threshold of 90%.
PoE/PoE+ allocation using LLDP information
LLDP with PoE
When using PoE, enabling
poe-lldp-detect
allows automatic power configuration if the link partner supports
PoE. When LLDP is enabled, the information about the power usage of the PD is available, and the switch can
then comply with or ignore this information. You can configure PoE on each port according to the PD (IP phone,
wireless device, and so on) specified in the LLDP field. The default configuration is for PoE information to be
ignored if detected through LLDP.
NOTE:
Detecting PoE information via LLDP affects only power delivery; it does not affect normal Ethernet
connectivity.
114
Aruba 2930F / 2930M Management and Configuration Guide
for ArubaOS-Switch 16.08
