Extreme Networks Summit 300-48 - Load Sharing Power Supplies; Power Supplies

Port Power Management
Summit 300-48 Switch Software User Guide 137
Ports are powered based upon their priority and discovery time. Higher priority ports with the oldest
discovery time are powered first.
If a device consumes more power than it is allocated by class type, it is considered a class violation. The
device enters a fault state, and unreserved power is returned to the common pool. Power is also
returned to the common pool if a port is disconnected. The device stays in the fault state until you
explicitly clear the fault, disable the port for power, or disconnect the device.
Load Sharing Power Supplies
The PoE subsystem supports dual power supplies for either redundant or load-sharing modes.
Redundant mode is the default and provides hitless PoE should one of the two power supplies fail, be
removed, or powered off. Load-sharing mode allows both power supplies to provide power to the PoE
system, providing greater PoE power capacity. For load-sharing operation, the amount of power
provided to the PoE system is the sum of the power supplied by the power supplies.
NOTE
With load-sharing, all PoE devices may experience a power hit if a power supply fails.
ExtremeWare 6.2a.1.1.2 supports a 600 W AC power supply unit (PSU), which is identical to the existing
PSU except that it provides 600 W of power. To determine the wattage of the installed PSUs when the
PSUs are in redundant mode, use the
show inline-power command. If System maximum internal
inline-power
field indicates 480 W, that means that 600 W PSUs are installed.
ExtremeWare 6.2a.1.1.2 provides new firmware to support an advanced PoE controller. Previous
versions of ExtremeWare 6.2a.1 cannot be used on Summit 300-48 switches containing the new PoE
controller. If you attempt to install previous versions on a switch containing the new controller, an error
similar to the following is generated:
!Image doesn't support this
hardware ERROR
Redundant Operation
For redundant operation, the amount of power provided to the PoE system is the minimum wattage
supplied by either supply. If a power supply fails or is removed, power to the PoE system is unaffected;
thus powered devices do not experience a power loss.
Load-Sharing Operation
For load-sharing operation, the amount of power provided to the PoE system is the sum of the power
supplied by the power supplies. The maximum amount of power provided is listed in Table 56.
Table 56: Power supplies
Power Supplies Installed Mode Total Available Inline Power
Two 600 W Redundant 480 W
Two 600 W Load-sharing 480 W
One 600 W N/A 480 W
One 400 W, one 600 W Redundant 306 W
One 400 W, one 600 W Load-sharing 480 W