Port Power Events - Extreme Networks Summit 300-48 Software User's Manual

Power Over Ethernet
overall system limit is reached, additional PoE ports are powered based on the system
violation-precedence setting and port power priority.
The power port limit is also used during system operation to limit the power supplied to each PoE port.
If a powered device attempts to draw more power than has been budgeted, the chassis will remove
power from that port to prevent system overload or device damage.
NOTE
The operator set limit must be based upon the device manufacturer's specified maximal power draw. It
must not be derived from measured device power consumption, since the power draw typically
fluctuates.
Table 55 lists the commands used to set the operator limits on a per port basis.
Table 55: Operator Commands for Port Power Budgeting
Command
config inline-power operator-limit
<milliwatts> ports <portlist>
config inline-power violation-precedence [
operator-limit ] ports <portlist>
Port Power Budget Example:
Assume that a PD device maximal draw is 9W based on the manufacturer's specification. Such a device,
if classified, would be considered to be in class 3, and under the default configuration, would be
budgeted to draw 15.4 watts.
To budget the power based on 9W, enter the following configuration. It is assumed that the device will
be connected to slot 1, port 1, with budget is set to 10W, allowing a small tolerance above manufacturer
specification.
Summit300# config inline-power operator-limit 10000 port 1:1
Summit300# config inline-power violation-precedence operator-limit port 1:1

Port Power Events

If a port has sufficient reserved power for a newly discovered and classified device, the device receives
power. If additional power is required and the common pool has sufficient available power, the device
is powered and the incremental power is subtracted from the common pool. If the port does not have
reserved power, but sufficient power is available from the common pool, the power is subtracted from
the pool.
Port power budget is determined based upon the maximum class power levels or operator specification,
not actual consumed power. For example, if a port is configured with an operator limit of 20 watts and
the violation precedence is set to the operator limit, then 20 watts is budgeted for the port even if a 5
watt 802.3af compliant device is connected.
If a sufficient mix of reserved and common power is not available, the port enters a denied state and is
not given power.
136
Description
Use this command to set the maximum power available for PDs on a
per port basis.
Use this command to specify that a user-defined limit will apply to
the indicated port.
Summit 300-48 Switch Software User Guide