Administrator Guide

Manage Inline Power
By default, PoE/PoE+ is disabled.
To manage the inline power supplied to the ports, use the power inline mode command in Configuration mode.
This command has the following parameters.
• class — When you configure class mode, the maximum power for the particular class of device is allocated. Class mode supports
power allocation through Layer 2 classification and power negotiation by the LLDP 802.3at standard. You can use this mode to
configure port priority.
• static — When you configure static mode, the inline power is allocated based on the actual power consumed by the powered
device. The power the PD requests is allocated and is reduced from the available pool. Power negotiation through LLDP (extended
power via MDI TLVs or IEEE 802.3 at power-via-mdi TLVs) is not supported in static mode. Ports you configure in Static mode
reserve a fixed power allocation whether a device is connected or not. By default, 15.4 W is allocated for PoE and 30.0 W for PoE+.
No dynamic PoE/PoE+ class detection performs on Static ports. The default Power Management mode is static.
NOTE: The power inline max_milliwatts command enables the inline power supplied to an interface. The
max_milliwatts option works only when you use Static mode. When you enable Class mode, the max_milliwatts
option has no effect on the interface. Instead, the maximum limit in Class mode applies to the ports.
• stack-unit unit-number — Specify the stack unit number. The range is from 1 to 12.
Set the Threshold Limit for the PoE Power Budget
To set the global threshold limit of the total power available for PoE on the port use the power budget global-threshold
stack-unit unit—number threshold-value command in Configuration mode.
This command has the following parameters.
• stack unit unit-number — Enter the keywords stack unit and specify the stack unit number. The range is from 1 to 12.
• threshold-value — Enter the power threshold limit value in percentage. Range is from 10 to 99. Default value is 99.
Example of Setting the Global Threshold Limit
The following example sets the global threshold limit for the PoE power budget to 10 percent on stack unit 1.
Dell(conf)#power budget global-threshold stack-unit 1 10
Dell(conf)#exit
Dell#show power detail stack-unit 1
Unit Total System Redundancy Inline Inline Inline Inline Inline
Power Power Power Power Power Power Power Power
Available Consumed Consumed Threshold Available Allocated Consumed Remaining
(Watts) (Watts) (Watts) (%) (Watts) (Watts) (Watts) (Watts)
----------------------------------------------------------------------------------------
1 1100 150 0 10 95 0 0 95
Dell#
Manage Power Priorities
Ports enabled with PoE/PoE+ have power access priorities based on the configuration and the port number.
The power priority is assigned in the following order:
1. Ports configured using power inline mode stack-unit unit-number {class | static} — Ports with static setting
have higher priority than the ports with class setting.
2. Power priority setup using power inline priority {critical | high | low} — The critical has the highest priority and
low has the lowest priority. If you configure a priority with this command, the Dell Networking OS ignores any LLDP-MED priority on
the port. If you do not configure a priority with this command, the Dell Networking OS honors any LLDP-MED priority
3. Port Number — Ports with lower numbers have more priorities than ports with higher numbers.
584
Power over Ethernet (PoE)