138 Summit 300-48 Switch Software User Guide
Power Over Ethernet
The total power used by all PoE devices must not exceed the total available inline power indicated in
Table 56. If the power used exceeds the total available, power for all devices is removed. To plan for the
total power load, use the PoE device manufacturer’s maximum power use specifications. Use the
configure inline-power command to set a lower available inline power, set a limit to the amount of
power available to a specific port, or set the precedence of ports if power is removed.
NOTE
Do not use the output of the show inline-power command for planning. This output is a snapshot of
current power consumption and does not reflect the maximum power use possible.
If a power supply fails or is removed and the current draw of the attached devices exceeds the power
supplied by the remaining power supply, the power for all devices is removed and all devices
experience a power loss. After power is restored, the PoE system re-enables power to devices until the
supply limit is reached. This is likely to be the single supply limit, and previously powered devices
might not be repowered.
Changing Modes
Changing power supply modes from load-sharing to redundant requires first disabling inline power on
ports, as with other configuration commands. Changing from redundant to load-sharing is allowed
without disabling inline power, as this potentially increases the inline power available to the system.
The power supply mode configuration affects the configuration settings as outlined in Table 57. The
operator is responsible for correct system configuration. Changes between load-sharing and redundant
modes resulting in invalid configurations will be rejected.
Two 400 W Redundant 306 W
Two 400 W Load-sharing 480 W
One 400 W N/A 306 W
Table 57: Power Parameter Restrictions
Parameter Restriction
Slot Power Budget Cannot exceed configured card maximum capacity. System issues a warning if the
sum of the slot budgets exceeds the PSU capacity (based on the PSU mode setting
and installed power supplies). Configuration is not rejected.
Reserved-budget per Port The sum of the port reserved budgets cannot exceed the slot budget.
Table 58: Power Supply Mode Commands
Command Description
configure inline-power power-supply
[redundant | load-sharing]
Use this command to select the power supply operating mode
unconfigure inline-power power-supply Use this command to set the power supply operating mode to
redundant (default).
Table 56: Power supplies (continued)
Power Supplies Installed Mode Total Available Inline Power
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